{"id":678,"date":"2024-06-24T00:01:14","date_gmt":"2024-06-23T16:01:14","guid":{"rendered":"https:\/\/levin.ink\/?p=678"},"modified":"2024-06-24T00:01:14","modified_gmt":"2024-06-23T16:01:14","slug":"js-3-13-%e6%9d%82%e9%a1%b9%e4%b8%80","status":"publish","type":"post","link":"https:\/\/levin.ink\/?p=678","title":{"rendered":"JS &#8211; 3-13 \u6742\u9879\u4e00"},"content":{"rendered":"<h1>Proxy \u548c Reflect<\/h1>\n<p>\u4e00\u4e2a\u00a0<code>Proxy<\/code>\u00a0\u5bf9\u8c61\u5305\u88c5\u53e6\u4e00\u4e2a\u5bf9\u8c61\u5e76\u62e6\u622a\u8bf8\u5982\u8bfb\u53d6\/\u5199\u5165\u5c5e\u6027\u548c\u5176\u4ed6\u64cd\u4f5c\uff0c\u53ef\u4ee5\u9009\u62e9\u81ea\u884c\u5904\u7406\u5b83\u4eec\uff0c\u6216\u8005\u900f\u660e\u5730\u5141\u8bb8\u8be5\u5bf9\u8c61\u5904\u7406\u5b83\u4eec\u3002<br \/>\nProxy \u88ab\u7528\u4e8e\u4e86\u8bb8\u591a\u5e93\u548c\u67d0\u4e9b\u6d4f\u89c8\u5668\u6846\u67b6\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u770b\u5230\u8bb8\u591a\u5b9e\u9645\u5e94\u7528\u3002<\/p>\n<h2>Proxy<\/h2>\n<p>\u8bed\u6cd5\uff1a<\/p>\n<pre><code class=\"language-js\">let proxy = new Proxy(target, handler)\n<\/code><\/pre>\n<ul>\n<li><code>target<\/code>\u00a0\u2014\u2014 \u662f\u8981\u5305\u88c5\u7684\u5bf9\u8c61\uff0c\u53ef\u4ee5\u662f\u4efb\u4f55\u4e1c\u897f\uff0c\u5305\u62ec\u51fd\u6570\u3002<\/li>\n<li><code>handler<\/code>\u00a0\u2014\u2014 \u4ee3\u7406\u914d\u7f6e\uff1a\u5e26\u6709\u201c\u6355\u6349\u5668\u201d\uff08\u201ctraps\u201d\uff0c\u5373\u62e6\u622a\u64cd\u4f5c\u7684\u65b9\u6cd5\uff09\u7684\u5bf9\u8c61\u3002\u6bd4\u5982\u00a0<code>get<\/code>\u00a0\u6355\u6349\u5668\u7528\u4e8e\u8bfb\u53d6\u00a0<code>target<\/code>\u00a0\u7684\u5c5e\u6027\uff0c<code>set<\/code>\u00a0\u6355\u6349\u5668\u7528\u4e8e\u5199\u5165\u00a0<code>target<\/code>\u00a0\u7684\u5c5e\u6027\uff0c\u7b49\u7b49\u3002<br \/>\n\u5bf9\u00a0<code>proxy<\/code>\u00a0\u8fdb\u884c\u64cd\u4f5c\uff0c\u5982\u679c\u5728\u00a0<code>handler<\/code>\u00a0\u4e2d\u5b58\u5728\u76f8\u5e94\u7684\u6355\u6349\u5668\uff0c\u5219\u5b83\u5c06\u8fd0\u884c\uff0c\u5e76\u4e14 Proxy \u6709\u673a\u4f1a\u5bf9\u5176\u8fdb\u884c\u5904\u7406\uff0c\u5426\u5219\u5c06\u76f4\u63a5\u5bf9 target \u8fdb\u884c\u5904\u7406\u3002<br \/>\n\u9996\u5148\uff0c\u8ba9\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u6ca1\u6709\u4efb\u4f55\u6355\u6349\u5668\u7684\u4ee3\u7406\uff08Proxy\uff09\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let target = {};\nlet proxy = new Proxy(target, {}); \/\/ \u7a7a\u7684 handler \u5bf9\u8c61\n\nproxy.test = 5; \/\/ \u5199\u5165 proxy \u5bf9\u8c61 (1)\nalert(target.test); \/\/ 5\uff0ctest \u5c5e\u6027\u51fa\u73b0\u5728\u4e86 target \u4e2d\uff01\n\nalert(proxy.test); \/\/ 5\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u4ece proxy \u5bf9\u8c61\u8bfb\u53d6\u5b83 (2)\n\nfor(let key in proxy) alert(key); \/\/ test\uff0c\u8fed\u4ee3\u4e5f\u6b63\u5e38\u5de5\u4f5c (3)\n<\/code><\/pre>\n<p>\u7531\u4e8e\u6ca1\u6709\u6355\u6349\u5668\uff0c\u6240\u6709\u5bf9\u00a0<code>proxy<\/code>\u00a0\u7684\u64cd\u4f5c\u90fd\u76f4\u63a5\u8f6c\u53d1\u7ed9\u4e86\u00a0<code>target<\/code>\u3002<\/p>\n<ol>\n<li>\u5199\u5165\u64cd\u4f5c\u00a0<code>proxy.test=<\/code>\u00a0\u4f1a\u5c06\u503c\u5199\u5165\u00a0<code>target<\/code>\u3002<\/li>\n<li>\u8bfb\u53d6\u64cd\u4f5c\u00a0<code>proxy.test<\/code>\u00a0\u4f1a\u4ece\u00a0<code>target<\/code>\u00a0\u8fd4\u56de\u5bf9\u5e94\u7684\u503c\u3002<\/li>\n<li>\u8fed\u4ee3\u00a0<code>proxy<\/code>\u00a0\u4f1a\u4ece\u00a0<code>target<\/code>\u00a0\u8fd4\u56de\u5bf9\u5e94\u7684\u503c\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6ca1\u6709\u4efb\u4f55\u6355\u6349\u5668\uff0c<code>proxy<\/code>\u00a0\u662f\u4e00\u4e2a\u00a0<code>target<\/code>\u00a0\u7684\u900f\u660e\u5305\u88c5\u5668\uff08wrapper\uff09\u3002<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240623094648.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240623094648.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20240623094648.png\"><\/div><br \/>\n<code>Proxy<\/code>\u00a0\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u201c\u5947\u5f02\u5bf9\u8c61\uff08exotic object\uff09\u201d\u3002\u5b83\u6ca1\u6709\u81ea\u5df1\u7684\u5c5e\u6027\u3002\u5982\u679c\u00a0<code>handler<\/code>\u00a0\u4e3a\u7a7a\uff0c\u5219\u900f\u660e\u5730\u5c06\u64cd\u4f5c\u8f6c\u53d1\u7ed9\u00a0<code>target<\/code>\u3002<br \/>\n\u8981\u6fc0\u6d3b\u66f4\u591a\u529f\u80fd\uff0c\u8ba9\u6211\u4eec\u6dfb\u52a0\u6355\u6349\u5668\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u7528\u5b83\u4eec\u62e6\u622a\u4ec0\u4e48\uff1f<br \/>\n\u5bf9\u4e8e\u5bf9\u8c61\u7684\u5927\u591a\u6570\u64cd\u4f5c\uff0cJavaScript \u89c4\u8303\u4e2d\u6709\u4e00\u4e2a\u6240\u8c13\u7684\u201c\u5185\u90e8\u65b9\u6cd5\u201d\uff0c\u5b83\u63cf\u8ff0\u4e86\u6700\u5e95\u5c42\u7684\u5de5\u4f5c\u65b9\u5f0f\u3002\u4f8b\u5982\u00a0<code>[[Get]]<\/code>\uff0c\u7528\u4e8e\u8bfb\u53d6\u5c5e\u6027\u7684\u5185\u90e8\u65b9\u6cd5\uff0c<code>[[Set]]<\/code>\uff0c\u7528\u4e8e\u5199\u5165\u5c5e\u6027\u7684\u5185\u90e8\u65b9\u6cd5\uff0c\u7b49\u7b49\u3002\u8fd9\u4e9b\u65b9\u6cd5\u4ec5\u5728\u89c4\u8303\u4e2d\u4f7f\u7528\uff0c\u6211\u4eec\u4e0d\u80fd\u76f4\u63a5\u901a\u8fc7\u65b9\u6cd5\u540d\u8c03\u7528\u5b83\u4eec\u3002<br \/>\nProxy \u6355\u6349\u5668\u4f1a\u62e6\u622a\u8fd9\u4e9b\u65b9\u6cd5\u7684\u8c03\u7528\u3002\u5b83\u4eec\u5728\u00a0<a href=\"https:\/\/tc39.es\/ecma262\/#sec-proxy-object-internal-methods-and-internal-slots\">proxy \u89c4\u8303<\/a>\u00a0\u548c\u4e0b\u8868\u4e2d\u88ab\u5217\u51fa\u3002<br \/>\n\u5bf9\u4e8e\u6bcf\u4e2a\u5185\u90e8\u65b9\u6cd5\uff0c\u6b64\u8868\u4e2d\u90fd\u6709\u4e00\u4e2a\u6355\u6349\u5668\uff1a\u53ef\u7528\u4e8e\u6dfb\u52a0\u5230\u00a0<code>new Proxy<\/code>\u00a0\u7684\u00a0<code>handler<\/code>\u00a0\u53c2\u6570\u4e2d\u4ee5\u62e6\u622a\u64cd\u4f5c\u7684\u65b9\u6cd5\u540d\u79f0\uff1a<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>\u5185\u90e8\u65b9\u6cd5<\/th>\n<th>Handler \u65b9\u6cd5<\/th>\n<th>\u4f55\u65f6\u89e6\u53d1<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>[[Get]]<\/code><\/td>\n<td><code>get<\/code><\/td>\n<td>\u8bfb\u53d6\u5c5e\u6027<\/td>\n<\/tr>\n<tr>\n<td><code>[[Set]]<\/code><\/td>\n<td><code>set<\/code><\/td>\n<td>\u5199\u5165\u5c5e\u6027<\/td>\n<\/tr>\n<tr>\n<td><code>[[HasProperty]]<\/code><\/td>\n<td><code>has<\/code><\/td>\n<td><code>in<\/code>\u00a0\u64cd\u4f5c\u7b26<\/td>\n<\/tr>\n<tr>\n<td><code>[[Delete]]<\/code><\/td>\n<td><code>deleteProperty<\/code><\/td>\n<td><code>delete<\/code>\u00a0\u64cd\u4f5c\u7b26<\/td>\n<\/tr>\n<tr>\n<td><code>[[Call]]<\/code><\/td>\n<td><code>apply<\/code><\/td>\n<td>\u51fd\u6570\u8c03\u7528<\/td>\n<\/tr>\n<tr>\n<td><code>[[Construct]]<\/code><\/td>\n<td><code>construct<\/code><\/td>\n<td><code>new<\/code>\u00a0\u64cd\u4f5c\u7b26<\/td>\n<\/tr>\n<tr>\n<td><code>[[GetPrototypeOf]]<\/code><\/td>\n<td><code>getPrototypeOf<\/code><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/getPrototypeOf\">Object.getPrototypeOf<\/a><\/td>\n<\/tr>\n<tr>\n<td><code>[[SetPrototypeOf]]<\/code><\/td>\n<td><code>setPrototypeOf<\/code><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/setPrototypeOf\">Object.setPrototypeOf<\/a><\/td>\n<\/tr>\n<tr>\n<td><code>[[IsExtensible]]<\/code><\/td>\n<td><code>isExtensible<\/code><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/isExtensible\">Object.isExtensible<\/a><\/td>\n<\/tr>\n<tr>\n<td><code>[[PreventExtensions]]<\/code><\/td>\n<td><code>preventExtensions<\/code><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/preventExtensions\">Object.preventExtensions<\/a><\/td>\n<\/tr>\n<tr>\n<td><code>[[DefineOwnProperty]]<\/code><\/td>\n<td><code>defineProperty<\/code><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/defineProperty\">Object.defineProperty<\/a><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/defineProperties\">Object.defineProperties<\/a><\/td>\n<\/tr>\n<tr>\n<td><code>[[GetOwnProperty]]<\/code><\/td>\n<td><code>getOwnPropertyDescriptor<\/code><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/getOwnPropertyDescriptor\">Object.getOwnPropertyDescriptor<\/a><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><code>for..in<\/code><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><code>Object.keys\/values\/entries<\/code><\/td>\n<\/tr>\n<tr>\n<td><code>[[OwnPropertyKeys]]<\/code><\/td>\n<td><code>ownKeys<\/code><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/getOwnPropertyNames\">Object.getOwnPropertyNames<\/a><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/getOwnPropertySymbols\">Object.getOwnPropertySymbols<\/a><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><code>for..in<\/code><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><code>Object.keys\/values\/entries<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote>\n<p>\u4e0d\u53d8\u91cf\uff08Invariant\uff09<br \/>\nJavaScript \u5f3a\u5236\u6267\u884c\u67d0\u4e9b\u4e0d\u53d8\u91cf \u2014\u2014 \u5185\u90e8\u65b9\u6cd5\u548c\u6355\u6349\u5668\u5fc5\u987b\u6ee1\u8db3\u7684\u6761\u4ef6\u3002<br \/>\n\u5176\u4e2d\u5927\u591a\u6570\u7528\u4e8e\u8fd4\u56de\u503c\uff1a<\/p>\n<ul>\n<li><code>[[Set]]<\/code>\u00a0\u5982\u679c\u503c\u5df2\u6210\u529f\u5199\u5165\uff0c\u5219\u5fc5\u987b\u8fd4\u56de\u00a0<code>true<\/code>\uff0c\u5426\u5219\u8fd4\u56de\u00a0<code>false<\/code>\u3002<\/li>\n<li><code>[[Delete]]<\/code>\u00a0\u5982\u679c\u5df2\u6210\u529f\u5220\u9664\u8be5\u503c\uff0c\u5219\u5fc5\u987b\u8fd4\u56de\u00a0<code>true<\/code>\uff0c\u5426\u5219\u8fd4\u56de\u00a0<code>false<\/code>\u3002<\/li>\n<li>\u2026\u2026\u4f9d\u6b64\u7c7b\u63a8\uff0c\u6211\u4eec\u5c06\u5728\u4e0b\u9762\u7684\u793a\u4f8b\u4e2d\u770b\u5230\u66f4\u591a\u5185\u5bb9\u3002<br \/>\n\u8fd8\u6709\u5176\u4ed6\u4e00\u4e9b\u4e0d\u53d8\u91cf\uff0c\u4f8b\u5982\uff1a<\/li>\n<li>\u5e94\u7528\u4e8e\u4ee3\u7406\uff08proxy\uff09\u5bf9\u8c61\u7684\u00a0<code>[[GetPrototypeOf]]<\/code>\uff0c\u5fc5\u987b\u8fd4\u56de\u4e0e\u5e94\u7528\u4e8e\u88ab\u4ee3\u7406\u5bf9\u8c61\u7684\u00a0<code>[[GetPrototypeOf]]<\/code>\u00a0\u76f8\u540c\u7684\u503c\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u8bfb\u53d6\u4ee3\u7406\u5bf9\u8c61\u7684\u539f\u578b\u5fc5\u987b\u59cb\u7ec8\u8fd4\u56de\u88ab\u4ee3\u7406\u5bf9\u8c61\u7684\u539f\u578b\u3002<br \/>\n\u6355\u6349\u5668\u53ef\u4ee5\u62e6\u622a\u8fd9\u4e9b\u64cd\u4f5c\uff0c\u4f46\u662f\u5fc5\u987b\u9075\u5faa\u4e0a\u9762\u8fd9\u4e9b\u89c4\u5219\u3002<br \/>\n\u4e0d\u53d8\u91cf\u786e\u4fdd\u8bed\u8a00\u529f\u80fd\u7684\u6b63\u786e\u548c\u4e00\u81f4\u7684\u884c\u4e3a\u3002\u5b8c\u6574\u7684\u4e0d\u53d8\u91cf\u5217\u8868\u5728\u00a0<a href=\"https:\/\/tc39.es\/ecma262\/#sec-proxy-object-internal-methods-and-internal-slots\">\u89c4\u8303<\/a>\u00a0\u4e2d\u3002\u5982\u679c\u4f60\u4e0d\u505a\u5947\u602a\u7684\u4e8b\u60c5\uff0c\u4f60\u53ef\u80fd\u5c31\u4e0d\u4f1a\u8fdd\u53cd\u5b83\u4eec\u3002<\/li>\n<\/ul>\n<\/blockquote>\n<h2>\u5e26\u6709 get \u6355\u6349\u5668\u7684\u9ed8\u8ba4\u503c<\/h2>\n<p>\u6700\u5e38\u89c1\u7684\u6355\u6349\u5668\u662f\u7528\u4e8e\u8bfb\u53d6\/\u5199\u5165\u7684\u5c5e\u6027\u3002<br \/>\n\u8981\u62e6\u622a\u8bfb\u53d6\u64cd\u4f5c\uff0c<code>handler<\/code>\u00a0\u5e94\u8be5\u6709\u00a0<code>get(target, property, receiver)<\/code>\u00a0\u65b9\u6cd5\u3002<br \/>\n\u8bfb\u53d6\u5c5e\u6027\u65f6\u89e6\u53d1\u8be5\u65b9\u6cd5\uff0c\u53c2\u6570\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><code>target<\/code>\u00a0\u2014\u2014 \u662f\u76ee\u6807\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u88ab\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u9012\u7ed9\u00a0<code>new Proxy<\/code>\uff0c<\/li>\n<li><code>property<\/code>\u00a0\u2014\u2014 \u76ee\u6807\u5c5e\u6027\u540d\uff0c<\/li>\n<li><code>receiver<\/code>\u00a0\u2014\u2014 \u5982\u679c\u76ee\u6807\u5c5e\u6027\u662f\u4e00\u4e2a getter \u8bbf\u95ee\u5668\u5c5e\u6027\uff0c\u5219\u00a0<code>receiver<\/code>\u00a0\u5c31\u662f\u672c\u6b21\u8bfb\u53d6\u5c5e\u6027\u6240\u5728\u7684\u00a0<code>this<\/code>\u00a0\u5bf9\u8c61\u3002\u901a\u5e38\uff0c\u8fd9\u5c31\u662f\u00a0<code>proxy<\/code>\u00a0\u5bf9\u8c61\u672c\u8eab\uff08\u6216\u8005\uff0c\u5982\u679c\u6211\u4eec\u4ece proxy \u7ee7\u627f\uff0c\u5219\u662f\u4ece\u8be5 proxy \u7ee7\u627f\u7684\u5bf9\u8c61\uff09\u3002\u73b0\u5728\u6211\u4eec\u4e0d\u9700\u8981\u6b64\u53c2\u6570\uff0c\u56e0\u6b64\u7a0d\u540e\u6211\u4eec\u5c06\u5bf9\u5176\u8fdb\u884c\u8be6\u7ec6\u4ecb\u7ecd\u3002<br \/>\n\u8ba9\u6211\u4eec\u7528\u00a0<code>get<\/code>\u00a0\u6765\u5b9e\u73b0\u4e00\u4e2a\u5bf9\u8c61\u7684\u9ed8\u8ba4\u503c\u3002<br \/>\n\u6211\u4eec\u5c06\u521b\u5efa\u4e00\u4e2a\u5bf9\u4e0d\u5b58\u5728\u7684\u6570\u7ec4\u9879\u8fd4\u56de\u00a0<code>0<\/code>\u00a0\u7684\u6570\u7ec4\u3002<br \/>\n\u901a\u5e38\uff0c\u5f53\u4eba\u4eec\u5c1d\u8bd5\u83b7\u53d6\u4e0d\u5b58\u5728\u7684\u6570\u7ec4\u9879\u65f6\uff0c\u4ed6\u4eec\u4f1a\u5f97\u5230\u00a0<code>undefined<\/code>\uff0c\u4f46\u662f\u6211\u4eec\u5728\u8fd9\u5c06\u5e38\u89c4\u6570\u7ec4\u5305\u88c5\u5230\u4ee3\u7406\uff08proxy\uff09\u4e2d\uff0c\u4ee5\u6355\u83b7\u8bfb\u53d6\u64cd\u4f5c\uff0c\u5e76\u5728\u6ca1\u6709\u8981\u8bfb\u53d6\u7684\u5c5e\u6027\u7684\u65f6\u8fd4\u56de\u00a0<code>0<\/code>\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let numbers = [0, 1, 2];\n\nnumbers = new Proxy(numbers, {\n  get(target, prop) {\n    if (prop in target) {\n      return target[prop];\n    } else {\n      return 0; \/\/ \u9ed8\u8ba4\u503c\n    }\n  }\n});\n\nalert( numbers[1] ); \/\/ 1\nalert( numbers[123] ); \/\/ 0\uff08\u6ca1\u6709\u8fd9\u4e2a\u6570\u7ec4\u9879\uff09\n<\/code><\/pre>\n<p>\u6b63\u5982\u6211\u4eec\u6240\u770b\u5230\u7684\uff0c\u4f7f\u7528\u00a0<code>get<\/code>\u00a0\u6355\u6349\u5668\u5f88\u5bb9\u6613\u5b9e\u73b0\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u7528\u00a0<code>Proxy<\/code>\u00a0\u6765\u5b9e\u73b0\u201c\u9ed8\u8ba4\u201d\u503c\u7684\u4efb\u4f55\u903b\u8f91\u3002<br \/>\n\u60f3\u8c61\u4e00\u4e0b\uff0c\u6211\u4eec\u6709\u4e00\u672c\u8bcd\u5178\uff0c\u4e0a\u9762\u6709\u77ed\u8bed\u53ca\u5176\u7ffb\u8bd1\uff1a<\/p>\n<pre><code class=\"language-js\">let dictionary = {\n  'Hello': 'Hola',\n  'Bye': 'Adi\u00f3s'\n};\n\nalert( dictionary['Hello'] ); \/\/ Hola\nalert( dictionary['Welcome'] ); \/\/ undefined\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u5982\u679c\u6ca1\u6709\u6211\u4eec\u8981\u8bfb\u53d6\u7684\u77ed\u8bed\uff0c\u90a3\u4e48\u4ece\u00a0<code>dictionary<\/code>\u00a0\u8bfb\u53d6\u5b83\u5c06\u8fd4\u56de\u00a0<code>undefined<\/code>\u3002\u4f46\u5b9e\u9645\u4e0a\uff0c\u8fd4\u56de\u4e00\u4e2a\u672a\u7ffb\u8bd1\u7684\u77ed\u8bed\u901a\u5e38\u6bd4\u00a0<code>undefined<\/code>\u00a0\u8981\u597d\u3002\u56e0\u6b64\uff0c\u8ba9\u6211\u4eec\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u8fd4\u56de\u4e00\u4e2a\u672a\u7ffb\u8bd1\u7684\u77ed\u8bed\u6765\u66ff\u4ee3\u00a0<code>undefined<\/code>\u3002<br \/>\n\u4e3a\u6b64\uff0c\u6211\u4eec\u5c06\u628a\u00a0<code>dictionary<\/code>\u00a0\u5305\u88c5\u8fdb\u4e00\u4e2a\u62e6\u622a\u8bfb\u53d6\u64cd\u4f5c\u7684\u4ee3\u7406\uff1a<\/p>\n<pre><code class=\"language-js\">let dictionary = {\n  'Hello': 'Hola',\n  'Bye': 'Adi\u00f3s'\n};\n\ndictionary = new Proxy(dictionary, {\n  get(target, phrase) { \/\/ \u62e6\u622a\u8bfb\u53d6\u5c5e\u6027\u64cd\u4f5c\n    if (phrase in target) { \/\/\u5982\u679c\u8bcd\u5178\u4e2d\u6709\u8be5\u77ed\u8bed\n      return target[phrase]; \/\/ \u8fd4\u56de\u5176\u7ffb\u8bd1\n    } else {\n      \/\/ \u5426\u5219\u8fd4\u56de\u672a\u7ffb\u8bd1\u7684\u77ed\u8bed\n      return phrase;\n    }\n  }\n});\n\n\/\/ \u5728\u8bcd\u5178\u4e2d\u67e5\u627e\u4efb\u610f\u77ed\u8bed\uff01\n\/\/ \u6700\u574f\u7684\u60c5\u51b5\u4e5f\u53ea\u662f\u5b83\u4eec\u6ca1\u6709\u88ab\u7ffb\u8bd1\u3002\nalert( dictionary['Hello'] ); \/\/ Hola\nalert( dictionary['Welcome to Proxy']); \/\/ Welcome to Proxy\uff08\u6ca1\u6709\u88ab\u7ffb\u8bd1\uff09\n<\/code><\/pre>\n<blockquote>\n<p>\u8bf7\u6ce8\u610f\uff1a<br \/>\n\u8bf7\u6ce8\u610f\u4ee3\u7406\u5982\u4f55\u8986\u76d6\u53d8\u91cf\uff1a<\/p>\n<\/blockquote>\n<pre><code class=\"language-js\">dictionary = new Proxy(dictionary, ...);\n<\/code><\/pre>\n<blockquote>\n<p>\u4ee3\u7406\u5e94\u8be5\u5728\u6240\u6709\u5730\u65b9\u90fd\u5b8c\u5168\u66ff\u4ee3\u76ee\u6807\u5bf9\u8c61\u3002\u76ee\u6807\u5bf9\u8c61\u88ab\u4ee3\u7406\u540e\uff0c\u4efb\u4f55\u4eba\u90fd\u4e0d\u5e94\u8be5\u518d\u5f15\u7528\u76ee\u6807\u5bf9\u8c61\u3002\u5426\u5219\u5f88\u5bb9\u6613\u641e\u7838\u3002<\/p>\n<\/blockquote>\n<h2>\u4f7f\u7528 set \u6355\u6349\u5668\u8fdb\u884c\u9a8c\u8bc1<\/h2>\n<p>\u5047\u8bbe\u6211\u4eec\u60f3\u8981\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u6570\u5b57\u7684\u6570\u7ec4\u3002\u5982\u679c\u6dfb\u52a0\u4e86\u5176\u4ed6\u7c7b\u578b\u7684\u503c\uff0c\u5219\u5e94\u8be5\u629b\u51fa\u4e00\u4e2a\u9519\u8bef\u3002<br \/>\n\u5f53\u5199\u5165\u5c5e\u6027\u65f6\u00a0<code>set<\/code>\u00a0\u6355\u6349\u5668\u88ab\u89e6\u53d1\u3002<br \/>\n<code>set(target, property, value, receiver)<\/code>\uff1a<\/p>\n<ul>\n<li><code>target<\/code>\u00a0\u2014\u2014 \u662f\u76ee\u6807\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u88ab\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u9012\u7ed9\u00a0<code>new Proxy<\/code>\uff0c<\/li>\n<li><code>property<\/code>\u00a0\u2014\u2014 \u76ee\u6807\u5c5e\u6027\u540d\u79f0\uff0c<\/li>\n<li><code>value<\/code>\u00a0\u2014\u2014 \u76ee\u6807\u5c5e\u6027\u7684\u503c\uff0c<\/li>\n<li><code>receiver<\/code>\u00a0\u2014\u2014 \u4e0e\u00a0<code>get<\/code>\u00a0\u6355\u6349\u5668\u7c7b\u4f3c\uff0c\u4ec5\u4e0e setter \u8bbf\u95ee\u5668\u5c5e\u6027\u76f8\u5173\u3002<br \/>\n\u5982\u679c\u5199\u5165\u64cd\u4f5c\uff08setting\uff09\u6210\u529f\uff0c<code>set<\/code>\u00a0\u6355\u6349\u5668\u5e94\u8be5\u8fd4\u56de\u00a0<code>true<\/code>\uff0c\u5426\u5219\u8fd4\u56de\u00a0<code>false<\/code>\uff08\u89e6\u53d1\u00a0<code>TypeError<\/code>\uff09\u3002<br \/>\n\u8ba9\u6211\u4eec\u7528\u5b83\u6765\u9a8c\u8bc1\u65b0\u503c\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let numbers = [];\n\nnumbers = new Proxy(numbers, { \/\/ (*)\n  set(target, prop, val) { \/\/ \u62e6\u622a\u5199\u5165\u5c5e\u6027\u64cd\u4f5c\n    if (typeof val == 'number') {\n      target[prop] = val;\n      return true;\n    } else {\n      return false;\n    }\n  }\n});\n\nnumbers.push(1); \/\/ \u6dfb\u52a0\u6210\u529f\nnumbers.push(2); \/\/ \u6dfb\u52a0\u6210\u529f\nalert(&quot;Length is: &quot; + numbers.length); \/\/ 2\n\nnumbers.push(&quot;test&quot;); \/\/ TypeError\uff08proxy \u7684 'set' \u8fd4\u56de false\uff09\n\nalert(&quot;This line is never reached (error in the line above)&quot;);\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff1a\u6570\u7ec4\u7684\u5185\u5efa\u65b9\u6cd5\u4f9d\u7136\u6709\u6548\uff01\u503c\u88ab\u4f7f\u7528\u00a0<code>push<\/code>\u00a0\u65b9\u6cd5\u6dfb\u52a0\u5230\u6570\u7ec4\u3002\u5f53\u503c\u88ab\u6dfb\u52a0\u5230\u6570\u7ec4\u540e\uff0c\u6570\u7ec4\u7684\u00a0<code>length<\/code>\u00a0\u5c5e\u6027\u4f1a\u81ea\u52a8\u589e\u52a0\u3002\u6211\u4eec\u7684\u4ee3\u7406\u5bf9\u8c61 proxy \u4e0d\u4f1a\u7834\u574f\u4efb\u4f55\u4e1c\u897f\u3002<br \/>\n\u6211\u4eec\u4e0d\u5fc5\u91cd\u5199\u8bf8\u5982\u00a0<code>push<\/code>\u00a0\u548c\u00a0<code>unshift<\/code>\u00a0\u7b49\u6dfb\u52a0\u5143\u7d20\u7684\u6570\u7ec4\u65b9\u6cd5\uff0c\u5c31\u53ef\u4ee5\u5728\u5176\u4e2d\u6dfb\u52a0\u68c0\u67e5\uff0c\u56e0\u4e3a\u5728\u5185\u90e8\u5b83\u4eec\u4f7f\u7528\u4ee3\u7406\u6240\u62e6\u622a\u7684\u00a0<code>[[Set]]<\/code>\u00a0\u64cd\u4f5c\u3002<br \/>\n\u56e0\u6b64\uff0c\u4ee3\u7801\u7b80\u6d01\u660e\u4e86\u3002<\/p>\n<blockquote>\n<p>\u522b\u5fd8\u4e86\u8fd4\u56de\u00a0<code>true<\/code><br \/>\n\u5982\u4e0a\u6240\u8ff0\uff0c\u8981\u4fdd\u6301\u4e0d\u53d8\u91cf\u3002<br \/>\n\u5bf9\u4e8e\u00a0<code>set<\/code>\u00a0\u64cd\u4f5c\uff0c\u5b83\u5fc5\u987b\u5728\u6210\u529f\u5199\u5165\u65f6\u8fd4\u56de\u00a0<code>true<\/code>\u3002<br \/>\n\u5982\u679c\u6211\u4eec\u5fd8\u8bb0\u8fd9\u6837\u505a\uff0c\u6216\u8fd4\u56de\u4efb\u4f55\u5047\uff08falsy\uff09\u503c\uff0c\u5219\u8be5\u64cd\u4f5c\u5c06\u89e6\u53d1\u00a0<code>TypeError<\/code>\u3002<\/p>\n<\/blockquote>\n<h2>\u4f7f\u7528 ownKeys \u548c getOwnPropertyDescriptor \u8fdb\u884c\u8fed\u4ee3<\/h2>\n<p><code>Object.keys<\/code>\uff0c<code>for..in<\/code>\u00a0\u5faa\u73af\u548c\u5927\u591a\u6570\u5176\u4ed6\u904d\u5386\u5bf9\u8c61\u5c5e\u6027\u7684\u65b9\u6cd5\u90fd\u4f7f\u7528\u5185\u90e8\u65b9\u6cd5\u00a0<code>[[OwnPropertyKeys]]<\/code>\uff08\u7531\u00a0<code>ownKeys<\/code>\u00a0\u6355\u6349\u5668\u62e6\u622a) \u6765\u83b7\u53d6\u5c5e\u6027\u5217\u8868\u3002<br \/>\n\u8fd9\u4e9b\u65b9\u6cd5\u5728\u7ec6\u8282\u4e0a\u6709\u6240\u4e0d\u540c\uff1a<\/p>\n<ul>\n<li><code>Object.getOwnPropertyNames(obj)<\/code>\u00a0\u8fd4\u56de\u975e symbol \u952e\u3002<\/li>\n<li><code>Object.getOwnPropertySymbols(obj)<\/code>\u00a0\u8fd4\u56de symbol \u952e\u3002<\/li>\n<li><code>Object.keys\/values()<\/code>\u00a0\u8fd4\u56de\u5e26\u6709\u00a0<code>enumerable<\/code>\u00a0\u6807\u5fd7\u7684\u975e symbol \u952e\/\u503c\uff08\u5c5e\u6027\u6807\u5fd7\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/property-descriptors\">\u5c5e\u6027\u6807\u5fd7\u548c\u5c5e\u6027\u63cf\u8ff0\u7b26<\/a>\u00a0\u4e00\u7ae0\u6709\u8be6\u7ec6\u8bb2\u89e3)\u3002<\/li>\n<li><code>for..in<\/code>\u00a0\u5faa\u73af\u904d\u5386\u6240\u6709\u5e26\u6709\u00a0<code>enumerable<\/code>\u00a0\u6807\u5fd7\u7684\u975e symbol \u952e\uff0c\u4ee5\u53ca\u539f\u578b\u5bf9\u8c61\u7684\u952e\u3002<br \/>\n\u2026\u2026\u4f46\u662f\u6240\u6709\u8fd9\u4e9b\u90fd\u4ece\u8be5\u5217\u8868\u5f00\u59cb\u3002<br \/>\n\u5728\u4e0b\u9762\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u00a0<code>ownKeys<\/code>\u00a0\u6355\u6349\u5668\u62e6\u622a\u00a0<code>for..in<\/code>\u00a0\u5bf9\u00a0<code>user<\/code>\u00a0\u7684\u904d\u5386\uff0c\u5e76\u4f7f\u7528\u00a0<code>Object.keys<\/code>\u00a0\u548c\u00a0<code>Object.values<\/code>\u00a0\u6765\u8df3\u8fc7\u4ee5\u4e0b\u5212\u7ebf\u00a0<code>_<\/code>\u00a0\u5f00\u5934\u7684\u5c5e\u6027\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let user = {\n  name: &quot;John&quot;,\n  age: 30,\n  _password: &quot;***&quot;\n};\n\nuser = new Proxy(user, {\n  ownKeys(target) {\n    return Object.keys(target).filter(key =&gt; !key.startsWith('_'));\n  }\n});\n\n\/\/ &quot;ownKeys&quot; \u8fc7\u6ee4\u6389\u4e86 _password\nfor(let key in user) alert(key); \/\/ name\uff0c\u7136\u540e\u662f age\n\n\/\/ \u5bf9\u8fd9\u4e9b\u65b9\u6cd5\u7684\u6548\u679c\u76f8\u540c\uff1a\nalert( Object.keys(user) ); \/\/ name,age\nalert( Object.values(user) ); \/\/ John,30\n<\/code><\/pre>\n<p>\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u5b83\u4ecd\u7136\u6709\u6548\u3002<br \/>\n\u5c3d\u7ba1\u5982\u6b64\uff0c\u4f46\u5982\u679c\u6211\u4eec\u8fd4\u56de\u5bf9\u8c61\u4e2d\u4e0d\u5b58\u5728\u7684\u952e\uff0c<code>Object.keys<\/code>\u00a0\u5e76\u4e0d\u4f1a\u5217\u51fa\u8fd9\u4e9b\u952e\uff1a<\/p>\n<pre><code class=\"language-js\">let user = { };\n\nuser = new Proxy(user, {\n  ownKeys(target) {\n    return ['a', 'b', 'c'];\n  }\n});\n\nalert( Object.keys(user) ); \/\/ &lt;empty&gt;\n<\/code><\/pre>\n<p>\u4e3a\u4ec0\u4e48\uff1f\u539f\u56e0\u5f88\u7b80\u5355\uff1a<code>Object.keys<\/code>\u00a0\u4ec5\u8fd4\u56de\u5e26\u6709\u00a0<code>enumerable<\/code>\u00a0\u6807\u5fd7\u7684\u5c5e\u6027\u3002\u4e3a\u4e86\u68c0\u67e5\u5b83\uff0c\u8be5\u65b9\u6cd5\u4f1a\u5bf9\u6bcf\u4e2a\u5c5e\u6027\u8c03\u7528\u5185\u90e8\u65b9\u6cd5\u00a0<code>[[GetOwnProperty]]<\/code>\u00a0\u6765\u83b7\u53d6\u00a0<a href=\"https:\/\/zh.javascript.info\/property-descriptors\">\u5b83\u7684\u63cf\u8ff0\u7b26\uff08descriptor\uff09<\/a>\u3002\u5728\u8fd9\u91cc\uff0c\u7531\u4e8e\u6ca1\u6709\u5c5e\u6027\uff0c\u5176\u63cf\u8ff0\u7b26\u4e3a\u7a7a\uff0c\u6ca1\u6709\u00a0<code>enumerable<\/code>\u00a0\u6807\u5fd7\uff0c\u56e0\u6b64\u5b83\u88ab\u7565\u8fc7\u3002<br \/>\n\u4e3a\u4e86\u8ba9\u00a0<code>Object.keys<\/code>\u00a0\u8fd4\u56de\u4e00\u4e2a\u5c5e\u6027\uff0c\u6211\u4eec\u9700\u8981\u5b83\u8981\u4e48\u5b58\u5728\u4e8e\u5e26\u6709\u00a0<code>enumerable<\/code>\u00a0\u6807\u5fd7\u7684\u5bf9\u8c61\uff0c\u8981\u4e48\u6211\u4eec\u53ef\u4ee5\u62e6\u622a\u5bf9\u00a0<code>[[GetOwnProperty]]<\/code>\u00a0\u7684\u8c03\u7528\uff08\u6355\u6349\u5668\u00a0<code>getOwnPropertyDescriptor<\/code>\u00a0\u53ef\u4ee5\u505a\u5230\u8fd9\u4e00\u70b9)\uff0c\u5e76\u8fd4\u56de\u5e26\u6709\u00a0<code>enumerable: true<\/code>\u00a0\u7684\u63cf\u8ff0\u7b26\u3002<br \/>\n\u8fd9\u662f\u5173\u4e8e\u6b64\u7684\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"language-js\">let user = { };\n\nuser = new Proxy(user, {\n  ownKeys(target) { \/\/ \u4e00\u65e6\u8981\u83b7\u53d6\u5c5e\u6027\u5217\u8868\u5c31\u4f1a\u88ab\u8c03\u7528\n    return ['a', 'b', 'c'];\n  },\n\n  getOwnPropertyDescriptor(target, prop) { \/\/ \u88ab\u6bcf\u4e2a\u5c5e\u6027\u8c03\u7528\n    return {\n      enumerable: true,\n      configurable: true\n      \/* ...\u5176\u4ed6\u6807\u5fd7\uff0c\u53ef\u80fd\u662f &quot;value:...&quot; *\/\n    };\n  }\n\n});\n\nalert( Object.keys(user) ); \/\/ a, b, c\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u518d\u6b21\u6ce8\u610f\uff1a\u5982\u679c\u8be5\u5c5e\u6027\u5728\u5bf9\u8c61\u4e2d\u4e0d\u5b58\u5728\uff0c\u90a3\u4e48\u6211\u4eec\u53ea\u9700\u8981\u62e6\u622a\u00a0<code>[[GetOwnProperty]]<\/code>\u3002<\/p>\n<h2>\u5177\u6709 deleteProperty \u548c\u5176\u4ed6\u6355\u6349\u5668\u7684\u53d7\u4fdd\u62a4\u5c5e\u6027<\/h2>\n<p>\u6709\u4e00\u4e2a\u666e\u904d\u7684\u7ea6\u5b9a\uff0c\u5373\u4ee5\u4e0b\u5212\u7ebf\u00a0<code>_<\/code>\u00a0\u5f00\u5934\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u662f\u5185\u90e8\u7684\u3002\u4e0d\u5e94\u4ece\u5bf9\u8c61\u5916\u90e8\u8bbf\u95ee\u5b83\u4eec\u3002<br \/>\n\u4ece\u6280\u672f\u4e0a\u8bb2\uff0c\u6211\u4eec\u4e5f\u662f\u80fd\u8bbf\u95ee\u5230\u8fd9\u6837\u7684\u5c5e\u6027\u7684\uff1a<\/p>\n<pre><code class=\"language-js\">let user = {\n  name: &quot;John&quot;,\n  _password: &quot;secret&quot;\n};\n\nalert(user._password); \/\/ secret\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u4f7f\u7528\u4ee3\u7406\u6765\u9632\u6b62\u5bf9\u4ee5\u00a0<code>_<\/code>\u00a0\u5f00\u5934\u7684\u5c5e\u6027\u7684\u4efb\u4f55\u8bbf\u95ee\u3002<br \/>\n\u6211\u4eec\u5c06\u9700\u8981\u4ee5\u4e0b\u6355\u6349\u5668\uff1a<\/p>\n<ul>\n<li><code>get<\/code>\u00a0\u8bfb\u53d6\u6b64\u7c7b\u5c5e\u6027\u65f6\u629b\u51fa\u9519\u8bef\uff0c<\/li>\n<li><code>set<\/code>\u00a0\u5199\u5165\u5c5e\u6027\u65f6\u629b\u51fa\u9519\u8bef\uff0c<\/li>\n<li><code>deleteProperty<\/code>\u00a0\u5220\u9664\u5c5e\u6027\u65f6\u629b\u51fa\u9519\u8bef\uff0c<\/li>\n<li><code>ownKeys<\/code>\u00a0\u5728\u4f7f\u7528\u00a0<code>for..in<\/code>\u00a0\u548c\u50cf\u00a0<code>Object.keys<\/code>\u00a0\u8fd9\u6837\u7684\u65b9\u6cd5\u65f6\u6392\u9664\u4ee5\u00a0<code>_<\/code>\u00a0\u5f00\u5934\u7684\u5c5e\u6027\u3002<br \/>\n\u4ee3\u7801\u5982\u4e0b\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let user = {\n  name: &quot;John&quot;,\n  _password: &quot;***&quot;\n};\n\nuser = new Proxy(user, {\n  get(target, prop) {\n    if (prop.startsWith('_')) {\n      throw new Error(&quot;Access denied&quot;);\n    }\n    let value = target[prop];\n    return (typeof value === 'function') ? value.bind(target) : value; \/\/ (*)\n  },\n  set(target, prop, val) { \/\/ \u62e6\u622a\u5c5e\u6027\u5199\u5165\n    if (prop.startsWith('_')) {\n      throw new Error(&quot;Access denied&quot;);\n    } else {\n      target[prop] = val;\n      return true;\n    }\n  },\n  deleteProperty(target, prop) { \/\/ \u62e6\u622a\u5c5e\u6027\u5220\u9664\n    if (prop.startsWith('_')) {\n      throw new Error(&quot;Access denied&quot;);\n    } else {\n      delete target[prop];\n      return true;\n    }\n  },\n  ownKeys(target) { \/\/ \u62e6\u622a\u8bfb\u53d6\u5c5e\u6027\u5217\u8868\n    return Object.keys(target).filter(key =&gt; !key.startsWith('_'));\n  }\n});\n\n\/\/ &quot;get&quot; \u4e0d\u5141\u8bb8\u8bfb\u53d6 _password\ntry {\n  alert(user._password); \/\/ Error: Access denied\n} catch(e) { alert(e.message); }\n\n\/\/ &quot;set&quot; \u4e0d\u5141\u8bb8\u5199\u5165 _password\ntry {\n  user._password = &quot;test&quot;; \/\/ Error: Access denied\n} catch(e) { alert(e.message); }\n\n\/\/ &quot;deleteProperty&quot; \u4e0d\u5141\u8bb8\u5220\u9664 _password\ntry {\n  delete user._password; \/\/ Error: Access denied\n} catch(e) { alert(e.message); }\n\n\/\/ &quot;ownKeys&quot; \u5c06 _password \u8fc7\u6ee4\u51fa\u53bb\nfor(let key in user) alert(key); \/\/ name\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\u5728\u00a0<code>(*)<\/code>\u00a0\u884c\u4e2d\u00a0<code>get<\/code>\u00a0\u6355\u6349\u5668\u7684\u91cd\u8981\u7ec6\u8282\uff1a<\/p>\n<pre><code class=\"language-js\">get(target, prop) {\n  \/\/ ...\n  let value = target[prop];\n  return (typeof value === 'function') ? value.bind(target) : value; \/\/ (*)\n}\n<\/code><\/pre>\n<p>\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u51fd\u6570\u53bb\u8c03\u7528\u00a0<code>value.bind(target)<\/code>\uff1f<br \/>\n\u539f\u56e0\u662f\u5bf9\u8c61\u65b9\u6cd5\uff08\u4f8b\u5982\u00a0<code>user.checkPassword()<\/code>\uff09\u5fc5\u987b\u80fd\u591f\u8bbf\u95ee\u00a0<code>_password<\/code>\uff1a<\/p>\n<pre><code class=\"language-js\">user = {\n  \/\/ ...\n  checkPassword(value) {\n    \/\/\u5bf9\u8c61\u65b9\u6cd5\u5fc5\u987b\u80fd\u8bfb\u53d6 _password\n    return value === this._password;\n  }\n}\n<\/code><\/pre>\n<p>\u5bf9\u00a0<code>user.checkPassword()<\/code>\u00a0\u7684\u8c03\u7528\u4f1a\u5c06\u88ab\u4ee3\u7406\u7684\u5bf9\u8c61\u00a0<code>user<\/code>\u00a0\u4f5c\u4e3a\u00a0<code>this<\/code>\uff08\u70b9\u7b26\u53f7\u4e4b\u524d\u7684\u5bf9\u8c61\u4f1a\u6210\u4e3a\u00a0<code>this<\/code>\uff09\uff0c\u56e0\u6b64\uff0c\u5f53\u5b83\u5c1d\u8bd5\u8bbf\u95ee\u00a0<code>this._password<\/code>\u00a0\u65f6\uff0c<code>get<\/code>\u00a0\u6355\u6349\u5668\u5c06\u6fc0\u6d3b\uff08\u5728\u4efb\u4f55\u5c5e\u6027\u8bfb\u53d6\u65f6\uff0c\u5b83\u90fd\u4f1a\u88ab\u89e6\u53d1\uff09\u5e76\u629b\u51fa\u9519\u8bef\u3002<br \/>\n\u56e0\u6b64\uff0c\u6211\u4eec\u5728\u00a0<code>(*)<\/code>\u00a0\u884c\u4e2d\u5c06\u5bf9\u8c61\u65b9\u6cd5\u7684\u4e0a\u4e0b\u6587\u7ed1\u5b9a\u5230\u539f\u59cb\u5bf9\u8c61\u00a0<code>target<\/code>\u3002\u7136\u540e\uff0c\u5b83\u4eec\u5c06\u6765\u7684\u8c03\u7528\u5c06\u4f7f\u7528\u00a0<code>target<\/code>\u00a0\u4f5c\u4e3a\u00a0<code>this<\/code>\uff0c\u4e0d\u4f1a\u89e6\u53d1\u4efb\u4f55\u6355\u6349\u5668\u3002<br \/>\n\u8be5\u89e3\u51b3\u65b9\u6848\u901a\u5e38\u53ef\u884c\uff0c\u4f46\u5e76\u4e0d\u7406\u60f3\uff0c\u56e0\u4e3a\u4e00\u4e2a\u65b9\u6cd5\u53ef\u80fd\u4f1a\u5c06\u672a\u88ab\u4ee3\u7406\u7684\u5bf9\u8c61\u4f20\u9012\u5230\u5176\u4ed6\u5730\u65b9\uff0c\u7136\u540e\u6211\u4eec\u5c31\u4f1a\u9677\u5165\u56f0\u5883\uff1a\u539f\u59cb\u5bf9\u8c61\u5728\u54ea\u91cc\uff0c\u88ab\u4ee3\u7406\u7684\u5bf9\u8c61\u5728\u54ea\u91cc\uff1f<br \/>\n\u6b64\u5916\uff0c\u4e00\u4e2a\u5bf9\u8c61\u53ef\u80fd\u4f1a\u88ab\u4ee3\u7406\u591a\u6b21\uff08\u591a\u4e2a\u4ee3\u7406\u53ef\u80fd\u4f1a\u5bf9\u8be5\u5bf9\u8c61\u6dfb\u52a0\u4e0d\u540c\u7684\u201c\u8c03\u6574\u201d\uff09\uff0c\u5e76\u4e14\u5982\u679c\u6211\u4eec\u5c06\u672a\u5305\u88c5\u7684\u5bf9\u8c61\u4f20\u9012\u7ed9\u65b9\u6cd5\uff0c\u5219\u53ef\u80fd\u4f1a\u4ea7\u751f\u610f\u60f3\u4e0d\u5230\u7684\u540e\u679c\u3002<br \/>\n\u56e0\u6b64\uff0c\u5728\u4efb\u4f55\u5730\u65b9\u90fd\u4e0d\u5e94\u4f7f\u7528\u8fd9\u79cd\u4ee3\u7406\u3002<\/p>\n<blockquote>\n<p>\u7c7b\u7684\u79c1\u6709\u5c5e\u6027<br \/>\n\u73b0\u4ee3 JavaScript \u5f15\u64ce\u539f\u751f\u652f\u6301 class \u4e2d\u7684\u79c1\u6709\u5c5e\u6027\uff0c\u8fd9\u4e9b\u79c1\u6709\u5c5e\u6027\u4ee5\u00a0<code>#<\/code>\u00a0\u4e3a\u524d\u7f00\u3002\u5b83\u4eec\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/private-protected-properties-methods\">\u79c1\u6709\u7684\u548c\u53d7\u4fdd\u62a4\u7684\u5c5e\u6027\u548c\u65b9\u6cd5<\/a>\u00a0\u4e00\u7ae0\u4e2d\u6709\u8be6\u7ec6\u63cf\u8ff0\u3002\u65e0\u9700\u4ee3\u7406\uff08proxy\uff09\u3002<br \/>\n\u4f46\u662f\uff0c\u6b64\u7c7b\u5c5e\u6027\u6709\u5176\u81ea\u8eab\u7684\u95ee\u9898\u3002\u7279\u522b\u662f\uff0c\u5b83\u4eec\u662f\u4e0d\u53ef\u7ee7\u627f\u7684\u3002<\/p>\n<\/blockquote>\n<h2>\u5e26\u6709 has \u6355\u6349\u5668\u7684 in range<\/h2>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u66f4\u591a\u793a\u4f8b\u3002<br \/>\n\u6211\u4eec\u6709\u4e00\u4e2a range \u5bf9\u8c61\uff1a<\/p>\n<pre><code class=\"language-js\">let range = {\n  start: 1,\n  end: 10\n};\n<\/code><\/pre>\n<p>\u6211\u4eec\u60f3\u4f7f\u7528\u00a0<code>in<\/code>\u00a0\u64cd\u4f5c\u7b26\u6765\u68c0\u67e5\u4e00\u4e2a\u6570\u5b57\u662f\u5426\u5728\u00a0<code>range<\/code>\u00a0\u8303\u56f4\u5185\u3002<br \/>\n<code>has<\/code>\u00a0\u6355\u6349\u5668\u4f1a\u62e6\u622a\u00a0<code>in<\/code>\u00a0\u8c03\u7528\u3002<br \/>\n<code>has(target, property)<\/code><\/p>\n<ul>\n<li><code>target<\/code>\u00a0\u2014\u2014 \u662f\u76ee\u6807\u5bf9\u8c61\uff0c\u88ab\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u9012\u7ed9\u00a0<code>new Proxy<\/code>\uff0c<\/li>\n<li><code>property<\/code>\u00a0\u2014\u2014 \u5c5e\u6027\u540d\u79f0\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let range = {\n  start: 1,\n  end: 10\n};\n\nrange = new Proxy(range, {\n  has(target, prop) {\n    return prop &gt;= target.start &amp;&amp; prop &lt;= target.end;\n  }\n});\n\nalert(5 in range); \/\/ true\nalert(50 in range); \/\/ false\n<\/code><\/pre>\n<p>\u6f02\u4eae\u7684\u8bed\u6cd5\u7cd6\uff0c\u4e0d\u662f\u5417\uff1f\u800c\u4e14\u5b9e\u73b0\u8d77\u6765\u975e\u5e38\u7b80\u5355\u3002<\/p>\n<h2>\u5305\u88c5\u51fd\u6570 apply<\/h2>\n<p>\u6211\u4eec\u4e5f\u53ef\u4ee5\u5c06\u4ee3\u7406\uff08proxy\uff09\u5305\u88c5\u5728\u51fd\u6570\u5468\u56f4\u3002<br \/>\n<code>apply(target, thisArg, args)<\/code>\u00a0\u6355\u6349\u5668\u80fd\u4f7f\u4ee3\u7406\u4ee5\u51fd\u6570\u7684\u65b9\u5f0f\u88ab\u8c03\u7528\uff1a<\/p>\n<ul>\n<li><code>target<\/code>\u00a0\u662f\u76ee\u6807\u5bf9\u8c61\uff08\u5728 JavaScript \u4e2d\uff0c\u51fd\u6570\u5c31\u662f\u4e00\u4e2a\u5bf9\u8c61\uff09\uff0c<\/li>\n<li><code>thisArg<\/code>\u00a0\u662f\u00a0<code>this<\/code>\u00a0\u7684\u503c\u3002<\/li>\n<li><code>args<\/code>\u00a0\u662f\u53c2\u6570\u5217\u8868\u3002<br \/>\n\u4f8b\u5982\uff0c\u8ba9\u6211\u4eec\u56de\u5fc6\u4e00\u4e0b\u6211\u4eec\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/call-apply-decorators\">\u88c5\u9970\u5668\u6a21\u5f0f\u548c\u8f6c\u53d1\uff0ccall\/apply<\/a>\u00a0\u4e00\u7ae0\u4e2d\u6240\u8bb2\u7684\u00a0<code>delay(f, ms)<\/code>\u00a0\u88c5\u9970\u5668\u3002<br \/>\n\u5728\u8be5\u7ae0\u4e2d\uff0c\u6211\u4eec\u6ca1\u6709\u7528 proxy \u6765\u5b9e\u73b0\u5b83\u3002\u8c03\u7528\u00a0<code>delay(f, ms)<\/code>\u00a0\u4f1a\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u4f1a\u5728\u00a0<code>ms<\/code>\u00a0\u6beb\u79d2\u540e\u628a\u6240\u6709\u8c03\u7528\u8f6c\u53d1\u7ed9\u00a0<code>f<\/code>\u3002<br \/>\n\u8fd9\u662f\u4ee5\u524d\u7684\u57fa\u4e8e\u51fd\u6570\u7684\u5b9e\u73b0\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">function delay(f, ms) {\n  \/\/ \u8fd4\u56de\u4e00\u4e2a\u5305\u88c5\u5668\uff08wrapper\uff09\uff0c\u8be5\u5305\u88c5\u5668\u5c06\u5728\u65f6\u95f4\u5230\u4e86\u7684\u65f6\u5019\u5c06\u8c03\u7528\u8f6c\u53d1\u7ed9\u51fd\u6570 f\n  return function() { \/\/ (*)\n    setTimeout(() =&gt; f.apply(this, arguments), ms);\n  };\n}\n\nfunction sayHi(user) {\n  alert(`Hello, ${user}!`);\n}\n\n\/\/ \u5728\u8fdb\u884c\u8fd9\u4e2a\u5305\u88c5\u540e\uff0csayHi \u51fd\u6570\u4f1a\u88ab\u5ef6\u8fdf 3 \u79d2\u540e\u88ab\u8c03\u7528\nsayHi = delay(sayHi, 3000);\n\nsayHi(&quot;John&quot;); \/\/ Hello, John! (after 3 seconds)\n<\/code><\/pre>\n<p>\u6b63\u5982\u6211\u4eec\u6240\u770b\u5230\u7684\u90a3\u6837\uff0c\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u5b83\u90fd\u662f\u53ef\u884c\u7684\u3002\u5305\u88c5\u51fd\u6570\u00a0<code>(*)<\/code>\u00a0\u5728\u5230\u8fbe\u5ef6\u8fdf\u7684\u65f6\u95f4\u540e\u540e\u6267\u884c\u8c03\u7528\u3002<br \/>\n\u4f46\u662f\u5305\u88c5\u51fd\u6570\u4e0d\u4f1a\u8f6c\u53d1\u5c5e\u6027\u8bfb\u53d6\/\u5199\u5165\u64cd\u4f5c\u6216\u8005\u4efb\u4f55\u5176\u4ed6\u64cd\u4f5c\u3002\u8fdb\u884c\u5305\u88c5\u540e\uff0c\u5c31\u5931\u53bb\u4e86\u5bf9\u539f\u59cb\u51fd\u6570\u5c5e\u6027\u7684\u8bbf\u95ee\uff0c\u4f8b\u5982\u00a0<code>name<\/code>\uff0c<code>length<\/code>\u00a0\u548c\u5176\u4ed6\u5c5e\u6027\uff1a<\/p>\n<pre><code class=\"language-js\">function delay(f, ms) {\n  return function() {\n    setTimeout(() =&gt; f.apply(this, arguments), ms);\n  };\n}\n\nfunction sayHi(user) {\n  alert(`Hello, ${user}!`);\n}\n\nalert(sayHi.length); \/\/ 1\uff08\u51fd\u6570\u7684 length \u662f\u51fd\u6570\u58f0\u660e\u4e2d\u7684\u53c2\u6570\u4e2a\u6570\uff09\n\nsayHi = delay(sayHi, 3000);\n\nalert(sayHi.length); \/\/ 0\uff08\u5728\u5305\u88c5\u5668\u58f0\u660e\u4e2d\uff0c\u53c2\u6570\u4e2a\u6570\u4e3a 0)\n<\/code><\/pre>\n<p><code>Proxy<\/code>\u00a0\u7684\u529f\u80fd\u8981\u5f3a\u5927\u5f97\u591a\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u5c06\u6240\u6709\u4e1c\u897f\u8f6c\u53d1\u5230\u76ee\u6807\u5bf9\u8c61\u3002<br \/>\n\u8ba9\u6211\u4eec\u4f7f\u7528\u00a0<code>Proxy<\/code>\u00a0\u6765\u66ff\u6362\u6389\u5305\u88c5\u51fd\u6570\uff1a<\/p>\n<pre><code class=\"language-js\">function delay(f, ms) {\n  return new Proxy(f, {\n    apply(target, thisArg, args) {\n      setTimeout(() =&gt; target.apply(thisArg, args), ms);\n    }\n  });\n}\n\nfunction sayHi(user) {\n  alert(`Hello, ${user}!`);\n}\n\nsayHi = delay(sayHi, 3000);\n\nalert(sayHi.length); \/\/ 1 (*) proxy \u5c06\u201c\u83b7\u53d6 length\u201d\u7684\u64cd\u4f5c\u8f6c\u53d1\u7ed9\u76ee\u6807\u5bf9\u8c61\n\nsayHi(&quot;John&quot;); \/\/ Hello, John!\uff083 \u79d2\u540e\uff09\n<\/code><\/pre>\n<p>\u7ed3\u679c\u662f\u76f8\u540c\u7684\uff0c\u4f46\u73b0\u5728\u4e0d\u4ec5\u4ec5\u8c03\u7528\uff0c\u800c\u4e14\u4ee3\u7406\u4e0a\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u80fd\u88ab\u8f6c\u53d1\u5230\u539f\u59cb\u51fd\u6570\u3002\u6240\u4ee5\u5728\u00a0<code>(*)<\/code>\u00a0\u884c\u5305\u88c5\u540e\u7684\u00a0<code>sayHi.length<\/code>\u00a0\u4f1a\u8fd4\u56de\u6b63\u786e\u7684\u7ed3\u679c\u3002<br \/>\n\u6211\u4eec\u5f97\u5230\u4e86\u4e00\u4e2a\u201c\u66f4\u4e30\u5bcc\u201d\u7684\u5305\u88c5\u5668\u3002<br \/>\n\u8fd8\u5b58\u5728\u5176\u4ed6\u6355\u6349\u5668\uff1a\u5b8c\u6574\u5217\u8868\u5728\u672c\u6587\u7684\u5f00\u5934\u3002\u5b83\u4eec\u7684\u4f7f\u7528\u6a21\u5f0f\u4e0e\u4e0a\u8ff0\u7c7b\u4f3c\u3002<\/p>\n<h2>Reflect<\/h2>\n<p><code>Reflect<\/code>\u00a0\u662f\u4e00\u4e2a\u5185\u5efa\u5bf9\u8c61\uff0c\u53ef\u7b80\u5316\u00a0<code>Proxy<\/code>\u00a0\u7684\u521b\u5efa\u3002<br \/>\n\u524d\u9762\u6240\u8bb2\u8fc7\u7684\u5185\u90e8\u65b9\u6cd5\uff0c\u4f8b\u5982\u00a0<code>[[Get]]<\/code>\u00a0\u548c\u00a0<code>[[Set]]<\/code>\u00a0\u7b49\uff0c\u90fd\u53ea\u662f\u89c4\u8303\u6027\u7684\uff0c\u4e0d\u80fd\u76f4\u63a5\u8c03\u7528\u3002<br \/>\n<code>Reflect<\/code>\u00a0\u5bf9\u8c61\u4f7f\u8c03\u7528\u8fd9\u4e9b\u5185\u90e8\u65b9\u6cd5\u6210\u4e3a\u4e86\u53ef\u80fd\u3002\u5b83\u7684\u65b9\u6cd5\u662f\u5185\u90e8\u65b9\u6cd5\u7684\u6700\u5c0f\u5305\u88c5\u3002<br \/>\n\u4ee5\u4e0b\u662f\u6267\u884c\u76f8\u540c\u64cd\u4f5c\u548c\u00a0<code>Reflect<\/code>\u00a0\u8c03\u7528\u7684\u793a\u4f8b\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u64cd\u4f5c<\/th>\n<th><code>Reflect<\/code>\u00a0\u8c03\u7528<\/th>\n<th>\u5185\u90e8\u65b9\u6cd5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>obj[prop]<\/code><\/td>\n<td><code>Reflect.get(obj, prop)<\/code><\/td>\n<td><code>[[Get]]<\/code><\/td>\n<\/tr>\n<tr>\n<td><code>obj[prop] = value<\/code><\/td>\n<td><code>Reflect.set(obj, prop, value)<\/code><\/td>\n<td><code>[[Set]]<\/code><\/td>\n<\/tr>\n<tr>\n<td><code>delete obj[prop]<\/code><\/td>\n<td><code>Reflect.deleteProperty(obj, prop)<\/code><\/td>\n<td><code>[[Delete]]<\/code><\/td>\n<\/tr>\n<tr>\n<td><code>new F(value)<\/code><\/td>\n<td><code>Reflect.construct(F, value)<\/code><\/td>\n<td><code>[[Construct]]<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4f8b\u5982<\/p>\n<pre><code class=\"language-js\">let user = {};\n\nReflect.set(user, 'name', 'John');\n\nalert(user.name); \/\/ John\n<\/code><\/pre>\n<p>\u5c24\u5176\u662f\uff0c<code>Reflect<\/code>\u00a0\u5141\u8bb8\u6211\u4eec\u5c06\u64cd\u4f5c\u7b26\uff08<code>new<\/code>\uff0c<code>delete<\/code>\uff0c\u2026\u2026\uff09\u4f5c\u4e3a\u51fd\u6570\uff08<code>Reflect.construct<\/code>\uff0c<code>Reflect.deleteProperty<\/code>\uff0c\u2026\u2026\uff09\u6267\u884c\u8c03\u7528\u3002\u8fd9\u662f\u4e00\u4e2a\u6709\u8da3\u7684\u529f\u80fd\uff0c\u4f46\u662f\u8fd9\u91cc\u8fd8\u6709\u4e00\u70b9\u5f88\u91cd\u8981\u3002<br \/>\n<strong>\u5bf9\u4e8e\u6bcf\u4e2a\u53ef\u88ab\u00a0<code>Proxy<\/code>\u00a0\u6355\u83b7\u7684\u5185\u90e8\u65b9\u6cd5\uff0c\u5728\u00a0<code>Reflect<\/code>\u00a0\u4e2d\u90fd\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684\u65b9\u6cd5\uff0c\u5176\u540d\u79f0\u548c\u53c2\u6570\u4e0e\u00a0<code>Proxy<\/code>\u00a0\u6355\u6349\u5668\u76f8\u540c\u3002<\/strong><br \/>\n\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>Reflect<\/code>\u00a0\u6765\u5c06\u64cd\u4f5c\u8f6c\u53d1\u7ed9\u539f\u59cb\u5bf9\u8c61\u3002<br \/>\n\u5728\u4e0b\u9762\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6355\u6349\u5668\u00a0<code>get<\/code>\u00a0\u548c\u00a0<code>set<\/code>\u00a0\u5747\u900f\u660e\u5730\uff08\u597d\u50cf\u5b83\u4eec\u90fd\u4e0d\u5b58\u5728\u4e00\u6837\uff09\u5c06\u8bfb\u53d6\/\u5199\u5165\u64cd\u4f5c\u8f6c\u53d1\u5230\u5bf9\u8c61\uff0c\u5e76\u663e\u793a\u4e00\u6761\u6d88\u606f\uff1a<\/p>\n<pre><code class=\"language-js\">let user = {\n  name: &quot;John&quot;,\n};\n\nuser = new Proxy(user, {\n  get(target, prop, receiver) {\n    alert(`GET ${prop}`);\n    return Reflect.get(target, prop, receiver); \/\/ (1)\n  },\n  set(target, prop, val, receiver) {\n    alert(`SET ${prop}=${val}`);\n    return Reflect.set(target, prop, val, receiver); \/\/ (2)\n  }\n});\n\nlet name = user.name; \/\/ \u663e\u793a &quot;GET name&quot;\nuser.name = &quot;Pete&quot;; \/\/ \u663e\u793a &quot;SET name=Pete&quot;\n<\/code><\/pre>\n<p>\u8fd9\u91cc\uff1a<\/p>\n<ul>\n<li><code>Reflect.get<\/code>\u00a0\u8bfb\u53d6\u4e00\u4e2a\u5bf9\u8c61\u5c5e\u6027\u3002<\/li>\n<li><code>Reflect.set<\/code>\u00a0\u5199\u5165\u4e00\u4e2a\u5bf9\u8c61\u5c5e\u6027\uff0c\u5982\u679c\u5199\u5165\u6210\u529f\u5219\u8fd4\u56de\u00a0<code>true<\/code>\uff0c\u5426\u5219\u8fd4\u56de\u00a0<code>false<\/code>\u3002<br \/>\n\u8fd9\u6837\uff0c\u4e00\u5207\u90fd\u5f88\u7b80\u5355\uff1a\u5982\u679c\u4e00\u4e2a\u6355\u6349\u5668\u60f3\u8981\u5c06\u8c03\u7528\u8f6c\u53d1\u7ed9\u5bf9\u8c61\uff0c\u5219\u53ea\u9700\u4f7f\u7528\u76f8\u540c\u7684\u53c2\u6570\u8c03\u7528\u00a0<code>Reflect.&lt;method&gt;<\/code>\u00a0\u5c31\u8db3\u591f\u4e86\u3002<br \/>\n\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4e0d\u4f7f\u7528\u00a0<code>Reflect<\/code>\u00a0\u5b8c\u6210\u76f8\u540c\u7684\u4e8b\u60c5\uff0c\u4f8b\u5982\uff0c\u7528\u4e8e\u8bfb\u53d6\u5c5e\u6027\u7684\u00a0<code>Reflect.get(target, prop, receiver)<\/code>\u00a0\u53ef\u4ee5\u88ab\u66ff\u6362\u4e3a\u00a0<code>target[prop]<\/code>\u3002\u5c3d\u7ba1\u6709\u4e00\u4e9b\u7ec6\u5fae\u7684\u5dee\u522b\u3002<\/li>\n<\/ul>\n<h3>\u4ee3\u7406\u4e00\u4e2a getter<\/h3>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u793a\u4f8b\uff0c\u6765\u8bf4\u660e\u4e3a\u4ec0\u4e48\u00a0<code>Reflect.get<\/code>\u00a0\u66f4\u597d\u3002\u6b64\u5916\uff0c\u6211\u4eec\u8fd8\u5c06\u770b\u5230\u4e3a\u4ec0\u4e48\u00a0<code>get\/set<\/code>\u00a0\u6709\u7b2c\u4e09\u4e2a\u53c2\u6570\u00a0<code>receiver<\/code>\uff0c\u800c\u4e14\u6211\u4eec\u4e4b\u524d\u4ece\u6765\u6ca1\u6709\u4f7f\u7528\u8fc7\u5b83\u3002<br \/>\n\u6211\u4eec\u6709\u4e00\u4e2a\u5e26\u6709\u00a0<code>_name<\/code>\u00a0\u5c5e\u6027\u548c getter \u7684\u5bf9\u8c61\u00a0<code>user<\/code>\u3002<br \/>\n\u8fd9\u662f\u5bf9\u00a0<code>user<\/code>\u00a0\u5bf9\u8c61\u7684\u4e00\u4e2a\u4ee3\u7406\uff1a<\/p>\n<pre><code class=\"language-js\">let user = {\n  _name: &quot;Guest&quot;,\n  get name() {\n    return this._name;\n  }\n};\n\nlet userProxy = new Proxy(user, {\n  get(target, prop, receiver) {\n    return target[prop];\n  }\n});\n\nalert(userProxy.name); \/\/ Guest\n<\/code><\/pre>\n<p>\u5176\u00a0<code>get<\/code>\u00a0\u6355\u6349\u5668\u5728\u8fd9\u91cc\u662f\u201c\u900f\u660e\u7684\u201d\uff0c\u5b83\u8fd4\u56de\u539f\u6765\u7684\u5c5e\u6027\uff0c\u4e0d\u4f1a\u505a\u4efb\u4f55\u5176\u4ed6\u7684\u4e8b\u3002\u8fd9\u5bf9\u4e8e\u6211\u4eec\u7684\u793a\u4f8b\u800c\u8a00\u5c31\u8db3\u591f\u4e86\u3002<br \/>\n\u4e00\u5207\u4f3c\u4e4e\u90fd\u5f88\u597d\u3002\u4f46\u662f\u8ba9\u6211\u4eec\u5c06\u793a\u4f8b\u53d8\u5f97\u7a0d\u5fae\u590d\u6742\u4e00\u70b9\u3002<br \/>\n\u53e6\u4e00\u4e2a\u5bf9\u8c61\u00a0<code>admin<\/code>\u00a0\u4ece\u00a0<code>user<\/code>\u00a0\u7ee7\u627f\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u89c2\u5bdf\u5230\u9519\u8bef\u7684\u884c\u4e3a\uff1a<\/p>\n<pre><code class=\"language-js\">let user = {\n  _name: &quot;Guest&quot;,\n  get name() {\n    return this._name;\n  }\n};\n\nlet userProxy = new Proxy(user, {\n  get(target, prop, receiver) {\n    return target[prop]; \/\/ (*) target = user\n  }\n});\n\nlet admin = {\n  __proto__: userProxy,\n  _name: &quot;Admin&quot;\n};\n\n\/\/ \u671f\u671b\u8f93\u51fa\uff1aAdmin\nalert(admin.name); \/\/ \u8f93\u51fa\uff1aGuest (?!?)\n<\/code><\/pre>\n<p>\u8bfb\u53d6\u00a0<code>admin.name<\/code>\u00a0\u5e94\u8be5\u8fd4\u56de\u00a0<code>&quot;Admin&quot;<\/code>\uff0c\u800c\u4e0d\u662f\u00a0<code>&quot;Guest&quot;<\/code>\uff01<br \/>\n\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f\u6216\u8bb8\u6211\u4eec\u5728\u7ee7\u627f\u65b9\u9762\u505a\u9519\u4e86\u4ec0\u4e48\uff1f<br \/>\n\u4f46\u662f\uff0c\u5982\u679c\u6211\u4eec\u79fb\u9664\u4ee3\u7406\uff0c\u90a3\u4e48\u4e00\u5207\u90fd\u4f1a\u6309\u9884\u671f\u8fdb\u884c\u3002<br \/>\n\u95ee\u9898\u5b9e\u9645\u4e0a\u51fa\u5728\u4ee3\u7406\u4e2d\uff0c\u5728\u00a0<code>(*)<\/code>\u00a0\u884c\u3002<\/p>\n<ol>\n<li>\u5f53\u6211\u4eec\u8bfb\u53d6\u00a0<code>admin.name<\/code>\u00a0\u65f6\uff0c\u7531\u4e8e\u00a0<code>admin<\/code>\u00a0\u5bf9\u8c61\u81ea\u8eab\u6ca1\u6709\u5bf9\u5e94\u7684\u5c5e\u6027\uff0c\u641c\u7d22\u5c06\u8f6c\u5230\u5176\u539f\u578b\u3002<\/li>\n<li>\u539f\u578b\u662f\u00a0<code>userProxy<\/code>\u3002<\/li>\n<li>\u4ece\u4ee3\u7406\u8bfb\u53d6\u00a0<code>name<\/code>\u00a0\u5c5e\u6027\u65f6\uff0c<code>get<\/code>\u00a0\u6355\u6349\u5668\u4f1a\u88ab\u89e6\u53d1\uff0c\u5e76\u4ece\u539f\u59cb\u5bf9\u8c61\u8fd4\u56de\u00a0<code>target[prop]<\/code>\u00a0\u5c5e\u6027\uff0c\u5728\u00a0<code>(*)<\/code>\u00a0\u884c\u3002<br \/>\n\u5f53\u8c03\u7528\u00a0<code>target[prop]<\/code>\u00a0\u65f6\uff0c\u82e5\u00a0<code>prop<\/code>\u00a0\u662f\u4e00\u4e2a getter\uff0c\u5b83\u5c06\u5728\u00a0<code>this=target<\/code>\u00a0\u4e0a\u4e0b\u6587\u4e2d\u8fd0\u884c\u5176\u4ee3\u7801\u3002\u56e0\u6b64\uff0c\u7ed3\u679c\u662f\u6765\u81ea\u539f\u59cb\u5bf9\u8c61\u00a0<code>target<\/code>\u00a0\u7684\u00a0<code>this._name<\/code>\uff0c\u5373\u6765\u81ea\u00a0<code>user<\/code>\u3002<br \/>\n\u4e3a\u4e86\u89e3\u51b3\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u9700\u8981\u00a0<code>get<\/code>\u00a0\u6355\u6349\u5668\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u00a0<code>receiver<\/code>\u3002\u5b83\u4fdd\u8bc1\u5c06\u6b63\u786e\u7684\u00a0<code>this<\/code>\u00a0\u4f20\u9012\u7ed9 getter\u3002\u5728\u6211\u4eec\u7684\u4f8b\u5b50\u4e2d\u662f\u00a0<code>admin<\/code>\u3002<br \/>\n\u5982\u4f55\u628a\u4e0a\u4e0b\u6587\u4f20\u9012\u7ed9 getter\uff1f\u5bf9\u4e8e\u4e00\u4e2a\u5e38\u89c4\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>call\/apply<\/code>\uff0c\u4f46\u8fd9\u662f\u4e00\u4e2a getter\uff0c\u5b83\u4e0d\u80fd\u201c\u88ab\u8c03\u7528\u201d\uff0c\u53ea\u80fd\u88ab\u8bbf\u95ee\u3002<br \/>\n<code>Reflect.get<\/code>\u00a0\u53ef\u4ee5\u505a\u5230\u3002\u5982\u679c\u6211\u4eec\u4f7f\u7528\u5b83\uff0c\u4e00\u5207\u90fd\u4f1a\u6b63\u5e38\u8fd0\u884c\u3002<br \/>\n\u8fd9\u662f\u66f4\u6b63\u540e\u7684\u53d8\u4f53\uff1a<\/li>\n<\/ol>\n<pre><code class=\"language-js\">let user = {\n  _name: &quot;Guest&quot;,\n  get name() {\n    return this._name;\n  }\n};\n\nlet userProxy = new Proxy(user, {\n  get(target, prop, receiver) { \/\/ receiver = admin\n    return Reflect.get(target, prop, receiver); \/\/ (*)\n  }\n});\n\n\nlet admin = {\n  __proto__: userProxy,\n  _name: &quot;Admin&quot;\n};\n\nalert(admin.name); \/\/ Admin\n<\/code><\/pre>\n<p>\u73b0\u5728\u00a0<code>receiver<\/code>\u00a0\u4fdd\u7559\u4e86\u5bf9\u6b63\u786e\u00a0<code>this<\/code>\u00a0\u7684\u5f15\u7528\uff08\u5373\u00a0<code>admin<\/code>\uff09\uff0c\u8be5\u5f15\u7528\u662f\u5728\u00a0<code>(*)<\/code>\u00a0\u884c\u4e2d\u88ab\u901a\u8fc7\u00a0<code>Reflect.get<\/code>\u00a0\u4f20\u9012\u7ed9 getter \u7684\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u628a\u6355\u6349\u5668\u91cd\u5199\u5f97\u66f4\u77ed\uff1a<\/p>\n<pre><code class=\"language-js\">get(target, prop, receiver) {\n  return Reflect.get(...arguments);\n}\n<\/code><\/pre>\n<p><code>Reflect<\/code>\u00a0\u8c03\u7528\u7684\u547d\u540d\u4e0e\u6355\u6349\u5668\u7684\u547d\u540d\u5b8c\u5168\u76f8\u540c\uff0c\u5e76\u4e14\u63a5\u53d7\u76f8\u540c\u7684\u53c2\u6570\u3002\u5b83\u4eec\u662f\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u4e13\u95e8\u8bbe\u8ba1\u7684\u3002<br \/>\n\u56e0\u6b64\uff0c<code>return Reflect...<\/code>\u00a0\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5b89\u5168\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u8f6c\u53d1\u64cd\u4f5c\uff0c\u5e76\u786e\u4fdd\u6211\u4eec\u4e0d\u4f1a\u5fd8\u8bb0\u4e0e\u6b64\u76f8\u5173\u7684\u4efb\u4f55\u5185\u5bb9\u3002<\/p>\n<h2>Proxy \u7684\u5c40\u9650\u6027<\/h2>\n<p>\u4ee3\u7406\u63d0\u4f9b\u4e86\u4e00\u79cd\u72ec\u7279\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u6700\u5e95\u5c42\u66f4\u6539\u6216\u8c03\u6574\u73b0\u6709\u5bf9\u8c61\u7684\u884c\u4e3a\u3002\u4f46\u662f\uff0c\u5b83\u5e76\u4e0d\u5b8c\u7f8e\u3002\u6709\u5c40\u9650\u6027\u3002<\/p>\n<h3>\u5185\u5efa\u5bf9\u8c61\uff0c\u5185\u90e8\u63d2\u69fd Internal slot<\/h3>\n<p>\u8bb8\u591a\u5185\u5efa\u5bf9\u8c61\uff0c\u4f8b\u5982\u00a0<code>Map<\/code>\uff0c<code>Set<\/code>\uff0c<code>Date<\/code>\uff0c<code>Promise<\/code>\u00a0\u7b49\uff0c\u90fd\u4f7f\u7528\u4e86\u6240\u8c13\u7684\u201c\u5185\u90e8\u63d2\u69fd\u201d\u3002<br \/>\n\u5b83\u4eec\u7c7b\u4f3c\u4e8e\u5c5e\u6027\uff0c\u4f46\u4ec5\u9650\u4e8e\u5185\u90e8\u4f7f\u7528\uff0c\u4ec5\u7528\u4e8e\u89c4\u8303\u76ee\u7684\u3002\u4f8b\u5982\uff0c<code>Map<\/code>\u00a0\u5c06\u9879\u76ee\uff08item\uff09\u5b58\u50a8\u5728\u00a0<code>[[MapData]]<\/code>\u00a0\u4e2d\u3002\u5185\u5efa\u65b9\u6cd5\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u5b83\u4eec\uff0c\u800c\u4e0d\u901a\u8fc7\u00a0<code>[[Get]]\/[[Set]]<\/code>\u00a0\u5185\u90e8\u65b9\u6cd5\u3002\u6240\u4ee5\u00a0<code>Proxy<\/code>\u00a0\u65e0\u6cd5\u62e6\u622a\u5b83\u4eec\u3002<br \/>\n\u4e3a\u4ec0\u4e48\u8981\u5728\u610f\u8fd9\u4e9b\u5462\uff1f\u6bd5\u7adf\u5b83\u4eec\u662f\u5185\u90e8\u7684\uff01<br \/>\n\u597d\u5427\uff0c\u95ee\u9898\u5728\u8fd9\u513f\u3002\u5728\u7c7b\u4f3c\u8fd9\u6837\u7684\u5185\u5efa\u5bf9\u8c61\u88ab\u4ee3\u7406\u540e\uff0c\u4ee3\u7406\u5bf9\u8c61\u6ca1\u6709\u8fd9\u4e9b\u5185\u90e8\u63d2\u69fd\uff0c\u56e0\u6b64\u5185\u5efa\u65b9\u6cd5\u5c06\u4f1a\u5931\u8d25\u3002<br \/>\n\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-js\">let map = new Map();\n\nlet proxy = new Proxy(map, {});\n\nproxy.set('test', 1); \/\/ Error\n<\/code><\/pre>\n<p>\u5728\u5185\u90e8\uff0c\u4e00\u4e2a\u00a0<code>Map<\/code>\u00a0\u5c06\u6240\u6709\u6570\u636e\u5b58\u50a8\u5728\u5176\u00a0<code>[[MapData]]<\/code>\u00a0\u5185\u90e8\u63d2\u69fd\u4e2d\u3002\u4ee3\u7406\u5bf9\u8c61\u6ca1\u6709\u8fd9\u6837\u7684\u63d2\u69fd\u3002<a href=\"https:\/\/tc39.es\/ecma262\/#sec-map.prototype.set\">\u5185\u5efa\u65b9\u6cd5\u00a0<code>Map.prototype.set<\/code><\/a>\u00a0\u65b9\u6cd5\u8bd5\u56fe\u8bbf\u95ee\u5185\u90e8\u5c5e\u6027\u00a0<code>this.[[MapData]]<\/code>\uff0c\u4f46\u7531\u4e8e\u00a0<code>this=proxy<\/code>\uff0c\u5728\u00a0<code>proxy<\/code>\u00a0\u4e2d\u65e0\u6cd5\u627e\u5230\u5b83\uff0c\u53ea\u80fd\u5931\u8d25\u3002<br \/>\n\u5e78\u8fd0\u7684\u662f\uff0c\u8fd9\u6709\u4e00\u79cd\u89e3\u51b3\u65b9\u6cd5\uff1a<\/p>\n<pre><code class=\"language-js\">let map = new Map();\n\nlet proxy = new Proxy(map, {\n  get(target, prop, receiver) {\n    let value = Reflect.get(...arguments);\n    return typeof value == 'function' ? value.bind(target) : value;\n  }\n});\n\nproxy.set('test', 1);\nalert(proxy.get('test')); \/\/ 1\uff08\u5de5\u4f5c\u4e86\uff01\uff09\n<\/code><\/pre>\n<p>\u73b0\u5728\u5b83\u6b63\u5e38\u5de5\u4f5c\u4e86\uff0c\u56e0\u4e3a\u00a0<code>get<\/code>\u00a0\u6355\u6349\u5668\u5c06\u51fd\u6570\u5c5e\u6027\uff08\u4f8b\u5982\u00a0<code>map.set<\/code>\uff09\u7ed1\u5b9a\u5230\u4e86\u76ee\u6807\u5bf9\u8c61\uff08<code>map<\/code>\uff09\u672c\u8eab\u3002<br \/>\n\u4e0e\u524d\u9762\u7684\u793a\u4f8b\u4e0d\u540c\uff0c<code>proxy.set(...)<\/code>\u00a0\u5185\u90e8\u00a0<code>this<\/code>\u00a0\u7684\u503c\u5e76\u4e0d\u662f\u00a0<code>proxy<\/code>\uff0c\u800c\u662f\u539f\u59cb\u7684\u00a0<code>map<\/code>\u3002\u56e0\u6b64\uff0c\u5f53<code>set<\/code>\u00a0\u6355\u6349\u5668\u7684\u5185\u90e8\u5b9e\u73b0\u5c1d\u8bd5\u8bbf\u95ee\u00a0<code>this.[[MapData]]<\/code>\u00a0\u5185\u90e8\u63d2\u69fd\u65f6\uff0c\u5b83\u4f1a\u6210\u529f\u3002<\/p>\n<blockquote>\n<p><code>Array<\/code>\u00a0\u6ca1\u6709\u5185\u90e8\u63d2\u69fd<br \/>\n\u4e00\u4e2a\u503c\u5f97\u6ce8\u610f\u7684\u4f8b\u5916\uff1a\u5185\u5efa\u00a0<code>Array<\/code>\u00a0\u6ca1\u6709\u4f7f\u7528\u5185\u90e8\u63d2\u69fd\u3002\u90a3\u662f\u51fa\u4e8e\u5386\u53f2\u539f\u56e0\uff0c\u56e0\u4e3a\u5b83\u51fa\u73b0\u4e8e\u5f88\u4e45\u4ee5\u524d\u3002<br \/>\n\u6240\u4ee5\uff0c\u4ee3\u7406\u6570\u7ec4\u65f6\u6ca1\u6709\u8fd9\u79cd\u95ee\u9898\u3002<\/p>\n<\/blockquote>\n<h3>\u79c1\u6709\u5b57\u6bb5<\/h3>\n<p>\u7c7b\u7684\u79c1\u6709\u5b57\u6bb5\u4e5f\u4f1a\u53d1\u751f\u7c7b\u4f3c\u7684\u60c5\u51b5\u3002<br \/>\n\u4f8b\u5982\uff0c<code>getName()<\/code>\u00a0\u65b9\u6cd5\u8bbf\u95ee\u79c1\u6709\u7684\u00a0<code>#name<\/code>\u00a0\u5c5e\u6027\uff0c\u5e76\u5728\u4ee3\u7406\u540e\u4e2d\u65ad\uff1a<\/p>\n<pre><code class=\"language-js\">class User {\n  #name = &quot;Guest&quot;;\n\n  getName() {\n    return this.#name;\n  }\n}\n\nlet user = new User();\n\nuser = new Proxy(user, {});\n\nalert(user.getName()); \/\/ Error\n<\/code><\/pre>\n<p>\u539f\u56e0\u662f\u79c1\u6709\u5b57\u6bb5\u662f\u901a\u8fc7\u5185\u90e8\u63d2\u69fd\u5b9e\u73b0\u7684\u3002JavaScript \u5728\u8bbf\u95ee\u5b83\u4eec\u65f6\u4e0d\u4f7f\u7528\u00a0<code>[[Get]]\/[[Set]]<\/code>\u3002<br \/>\n\u5728\u8c03\u7528\u00a0<code>getName()<\/code>\u00a0\u65f6\uff0c<code>this<\/code>\u00a0\u7684\u503c\u662f\u4ee3\u7406\u540e\u7684\u00a0<code>user<\/code>\uff0c\u5b83\u6ca1\u6709\u5e26\u6709\u79c1\u6709\u5b57\u6bb5\u7684\u63d2\u69fd\u3002<br \/>\n\u518d\u6b21\uff0c\u5e26\u6709\u00a0<code>bind<\/code>\u00a0\u65b9\u6cd5\u7684\u89e3\u51b3\u65b9\u6848\u4f7f\u5b83\u6062\u590d\u6b63\u5e38\uff1a<\/p>\n<pre><code class=\"language-js\">class User {\n  #name = &quot;Guest&quot;;\n\n  getName() {\n    return this.#name;\n  }\n}\n\nlet user = new User();\n\nuser = new Proxy(user, {\n  get(target, prop, receiver) {\n    let value = Reflect.get(...arguments);\n    return typeof value == 'function' ? value.bind(target) : value;\n  }\n});\n\nalert(user.getName()); \/\/ Guest\n<\/code><\/pre>\n<p>\u5982\u524d\u6240\u8ff0\uff0c\u8be5\u89e3\u51b3\u65b9\u6848\u4e5f\u6709\u7f3a\u70b9\uff1a\u5b83\u5c06\u539f\u59cb\u5bf9\u8c61\u66b4\u9732\u7ed9\u8be5\u65b9\u6cd5\uff0c\u53ef\u80fd\u4f7f\u5176\u8fdb\u4e00\u6b65\u4f20\u9012\u5e76\u7834\u574f\u5176\u4ed6\u4ee3\u7406\u529f\u80fd\u3002<\/p>\n<h3>Proxy != target<\/h3>\n<p>\u4ee3\u7406\u548c\u539f\u59cb\u5bf9\u8c61\u662f\u4e0d\u540c\u7684\u5bf9\u8c61\u3002\u8fd9\u5f88\u81ea\u7136\uff0c\u5bf9\u5427\uff1f<br \/>\n\u6240\u4ee5\uff0c\u5982\u679c\u6211\u4eec\u4f7f\u7528\u539f\u59cb\u5bf9\u8c61\u4f5c\u4e3a\u952e\uff0c\u7136\u540e\u5bf9\u5176\u8fdb\u884c\u4ee3\u7406\uff0c\u4e4b\u540e\u5374\u65e0\u6cd5\u627e\u5230\u4ee3\u7406\u4e86\uff1a<\/p>\n<pre><code class=\"language-js\">let allUsers = new Set();\n\nclass User {\n  constructor(name) {\n    this.name = name;\n    allUsers.add(this);\n  }\n}\n\nlet user = new User(&quot;John&quot;);\n\nalert(allUsers.has(user)); \/\/ true\n\nuser = new Proxy(user, {});\n\nalert(allUsers.has(user)); \/\/ false\n<\/code><\/pre>\n<p>\u5982\u6211\u4eec\u6240\u89c1\uff0c\u8fdb\u884c\u4ee3\u7406\u540e\uff0c\u6211\u4eec\u5728\u00a0<code>allUsers<\/code>\u00a0\u4e2d\u627e\u4e0d\u5230\u00a0<code>user<\/code>\uff0c\u56e0\u4e3a\u4ee3\u7406\u662f\u4e00\u4e2a\u4e0d\u540c\u7684\u5bf9\u8c61\u3002<\/p>\n<blockquote>\n<p>Proxy \u65e0\u6cd5\u62e6\u622a\u4e25\u683c\u76f8\u7b49\u6027\u68c0\u67e5\u00a0<code>===<\/code><br \/>\nProxy \u53ef\u4ee5\u62e6\u622a\u8bb8\u591a\u64cd\u4f5c\u7b26\uff0c\u4f8b\u5982\u00a0<code>new<\/code>\uff08\u4f7f\u7528\u00a0<code>construct<\/code>\uff09\uff0c<code>in<\/code>\uff08\u4f7f\u7528\u00a0<code>has<\/code>\uff09\uff0c<code>delete<\/code>\uff08\u4f7f\u7528\u00a0<code>deleteProperty<\/code>\uff09\u7b49\u3002<br \/>\n\u4f46\u662f\u6ca1\u6709\u529e\u6cd5\u62e6\u622a\u5bf9\u4e8e\u5bf9\u8c61\u7684\u4e25\u683c\u76f8\u7b49\u6027\u68c0\u67e5\u3002\u4e00\u4e2a\u5bf9\u8c61\u53ea\u4e25\u683c\u7b49\u4e8e\u5176\u81ea\u8eab\uff0c\u6ca1\u6709\u5176\u4ed6\u503c\u3002<br \/>\n\u56e0\u6b64\uff0c\u6bd4\u8f83\u5bf9\u8c61\u662f\u5426\u76f8\u7b49\u7684\u6240\u6709\u64cd\u4f5c\u548c\u5185\u5efa\u7c7b\u90fd\u4f1a\u533a\u5206\u5bf9\u8c61\u548c\u4ee3\u7406\u3002\u8fd9\u91cc\u6ca1\u6709\u900f\u660e\u7684\u66ff\u4ee3\u54c1\u3002<\/p>\n<\/blockquote>\n<h2>\u53ef\u64a4\u9500 Proxy<\/h2>\n<p>\u4e00\u4e2a\u00a0<strong>\u53ef\u64a4\u9500<\/strong>\u00a0\u7684\u4ee3\u7406\u662f\u53ef\u4ee5\u88ab\u7981\u7528\u7684\u4ee3\u7406\u3002<br \/>\n\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8d44\u6e90\uff0c\u5e76\u4e14\u60f3\u968f\u65f6\u5173\u95ed\u5bf9\u8be5\u8d44\u6e90\u7684\u8bbf\u95ee\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u505a\u7684\u662f\u5c06\u5b83\u5305\u88c5\u6210\u53ef\u4e00\u4e2a\u64a4\u9500\u7684\u4ee3\u7406\uff0c\u6ca1\u6709\u4efb\u4f55\u6355\u6349\u5668\u3002\u8fd9\u6837\u7684\u4ee3\u7406\u4f1a\u5c06\u64cd\u4f5c\u8f6c\u53d1\u7ed9\u5bf9\u8c61\uff0c\u5e76\u4e14\u6211\u4eec\u53ef\u4ee5\u968f\u65f6\u5c06\u5176\u7981\u7528\u3002<br \/>\n\u8bed\u6cd5\u4e3a\uff1a<\/p>\n<pre><code class=\"language-js\">let {proxy, revoke} = Proxy.revocable(target, handler)\n<\/code><\/pre>\n<p>\u8be5\u8c03\u7528\u8fd4\u56de\u4e00\u4e2a\u5e26\u6709\u00a0<code>proxy<\/code>\u00a0\u548c\u00a0<code>revoke<\/code>\u00a0\u51fd\u6570\u7684\u5bf9\u8c61\u4ee5\u5c06\u5176\u7981\u7528\u3002<br \/>\n\u8fd9\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"language-js\">let object = {\n  data: &quot;Valuable data&quot;\n};\n\nlet {proxy, revoke} = Proxy.revocable(object, {});\n\n\/\/ \u5c06 proxy \u4f20\u9012\u5230\u5176\u4ed6\u67d0\u5904\uff0c\u800c\u4e0d\u662f\u5bf9\u8c61...\nalert(proxy.data); \/\/ Valuable data\n\n\/\/ \u7a0d\u540e\uff0c\u5728\u6211\u4eec\u7684\u4ee3\u7801\u4e2d\nrevoke();\n\n\/\/ proxy \u4e0d\u518d\u5de5\u4f5c\uff08revoked\uff09\nalert(proxy.data); \/\/ Error\n<\/code><\/pre>\n<p>\u5bf9\u00a0<code>revoke()<\/code>\u00a0\u7684\u8c03\u7528\u4f1a\u4ece\u4ee3\u7406\u4e2d\u5220\u9664\u5bf9\u76ee\u6807\u5bf9\u8c61\u7684\u6240\u6709\u5185\u90e8\u5f15\u7528\uff0c\u56e0\u6b64\u5b83\u4eec\u4e4b\u95f4\u518d\u65e0\u8fde\u63a5\u3002<br \/>\n\u6700\u521d\uff0c<code>revoke<\/code>\u00a0\u4e0e\u00a0<code>proxy<\/code>\u00a0\u662f\u5206\u5f00\u7684\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u4f20\u9012\u00a0<code>proxy<\/code>\uff0c\u540c\u65f6\u5c06\u00a0<code>revoke<\/code>\u00a0\u7559\u5728\u5f53\u524d\u8303\u56f4\u5185\u3002<br \/>\n\u6211\u4eec\u4e5f\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u00a0<code>proxy.revoke = revoke<\/code>\u00a0\u6765\u5c06\u00a0<code>revoke<\/code>\u00a0\u7ed1\u5b9a\u5230\u00a0<code>proxy<\/code>\u3002<br \/>\n\u53e6\u4e00\u79cd\u9009\u62e9\u662f\u521b\u5efa\u4e00\u4e2a\u00a0<code>WeakMap<\/code>\uff0c\u5176\u4e2d\u00a0<code>proxy<\/code>\u00a0\u4f5c\u4e3a\u952e\uff0c\u76f8\u5e94\u7684\u00a0<code>revoke<\/code>\u00a0\u4f5c\u4e3a\u503c\uff0c\u8fd9\u6837\u53ef\u4ee5\u8f7b\u677e\u627e\u5230\u00a0<code>proxy<\/code>\u00a0\u6240\u5bf9\u5e94\u7684\u00a0<code>revoke<\/code>\uff1a<\/p>\n<pre><code class=\"language-js\">let revokes = new WeakMap();\n\nlet object = {\n  data: &quot;Valuable data&quot;\n};\n\nlet {proxy, revoke} = Proxy.revocable(object, {});\n\nrevokes.set(proxy, revoke);\n\n\/\/ ...\u6211\u4eec\u4ee3\u7801\u4e2d\u7684\u5176\u4ed6\u4f4d\u7f6e...\nrevoke = revokes.get(proxy);\nrevoke();\n\nalert(proxy.data); \/\/ Error\uff08revoked\uff09\n<\/code><\/pre>\n<p>\u6b64\u5904\u6211\u4eec\u4f7f\u7528\u00a0<code>WeakMap<\/code>\u00a0\u800c\u4e0d\u662f\u00a0<code>Map<\/code>\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4f1a\u963b\u6b62\u5783\u573e\u56de\u6536\u3002\u5982\u679c\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\u53d8\u5f97\u201c\u4e0d\u53ef\u8bbf\u95ee\u201d\uff08\u4f8b\u5982\uff0c\u6ca1\u6709\u53d8\u91cf\u518d\u5f15\u7528\u5b83\uff09\uff0c\u5219\u00a0<code>WeakMap<\/code>\u00a0\u5141\u8bb8\u5c06\u5176\u4e0e\u5b83\u7684\u00a0<code>revoke<\/code>\u00a0\u4e00\u8d77\u4ece\u5185\u5b58\u4e2d\u6e05\u9664\uff0c\u56e0\u4e3a\u6211\u4eec\u4e0d\u518d\u9700\u8981\u5b83\u4e86\u3002<\/p>\n<h2>MORE<\/h2>\n<ul>\n<li>\u89c4\u8303\uff1a<a href=\"https:\/\/tc39.es\/ecma262\/#sec-proxy-object-internal-methods-and-internal-slots\">Proxy<\/a>\u3002<\/li>\n<li>MDN\uff1a<a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Proxy\">Proxy<\/a>\u3002<\/li>\n<\/ul>\n<h1>Eval\uff1a\u6267\u884c\u4ee3\u7801\u5b57\u7b26\u4e32<\/h1>\n<p>\u5185\u5efa\u51fd\u6570\u00a0<code>eval<\/code>\u00a0\u5141\u8bb8\u6267\u884c\u4e00\u4e2a\u4ee3\u7801\u5b57\u7b26\u4e32\u3002<br \/>\n\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-js\">let result = eval(code);\n<\/code><\/pre>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-js\">let code = 'alert(&quot;Hello&quot;)';\neval(code); \/\/ Hello\n<\/code><\/pre>\n<p>\u4ee3\u7801\u5b57\u7b26\u4e32\u53ef\u80fd\u4f1a\u6bd4\u8f83\u957f\uff0c\u5305\u542b\u6362\u884c\u7b26\u3001\u51fd\u6570\u58f0\u660e\u548c\u53d8\u91cf\u7b49\u3002<br \/>\n<code>eval<\/code>\u00a0\u7684\u7ed3\u679c\u662f\u6700\u540e\u4e00\u6761\u8bed\u53e5\u7684\u7ed3\u679c\u3002<br \/>\n\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-js\">let value = eval('1+1');\nalert(value); \/\/ 2\n<\/code><\/pre>\n<pre><code class=\"language-js\">let value = eval('let i = 0; ++i');\nalert(value); \/\/ 1\n<\/code><\/pre>\n<p><code>eval<\/code>\u00a0\u5185\u7684\u4ee3\u7801\u5728\u5f53\u524d\u8bcd\u6cd5\u73af\u5883\uff08lexical environment\uff09\u4e2d\u6267\u884c\uff0c\u56e0\u6b64\u5b83\u80fd\u8bbf\u95ee\u5916\u90e8\u53d8\u91cf\uff1a<\/p>\n<pre><code class=\"language-js\">let a = 1;\n\nfunction f() {\n  let a = 2;\n\n  eval('alert(a)'); \/\/ 2\n}\n\nf();\n<\/code><\/pre>\n<p>\u5b83\u4e5f\u53ef\u4ee5\u66f4\u6539\u5916\u90e8\u53d8\u91cf\uff1a<\/p>\n<pre><code class=\"language-js\">let x = 5;\neval(&quot;x = 10&quot;);\nalert(x); \/\/ 10\uff0c\u503c\u88ab\u66f4\u6539\u4e86\n<\/code><\/pre>\n<p>\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c<code>eval<\/code>\u00a0\u6709\u5c5e\u4e8e\u81ea\u5df1\u7684\u8bcd\u6cd5\u73af\u5883\u3002\u56e0\u6b64\u6211\u4eec\u4e0d\u80fd\u4ece\u5916\u90e8\u8bbf\u95ee\u5728\u00a0<code>eval<\/code>\u00a0\u4e2d\u58f0\u660e\u7684\u51fd\u6570\u548c\u53d8\u91cf\uff1a<\/p>\n<pre><code class=\"language-js\">\/\/ \u63d0\u793a\uff1a\u672c\u6559\u7a0b\u6240\u6709\u53ef\u8fd0\u884c\u7684\u793a\u4f8b\u90fd\u9ed8\u8ba4\u542f\u7528\u4e86\u4e25\u683c\u6a21\u5f0f 'use strict'\n\neval(&quot;let x = 5; function f() {}&quot;);\n\nalert(typeof x); \/\/ undefined\uff08\u6ca1\u6709\u8fd9\u4e2a\u53d8\u91cf\uff09\n\/\/ \u51fd\u6570 f \u4e5f\u4e0d\u53ef\u4ece\u5916\u90e8\u8fdb\u884c\u8bbf\u95ee\n<\/code><\/pre>\n<p>\u5982\u679c\u4e0d\u542f\u7528\u4e25\u683c\u6a21\u5f0f\uff0c<code>eval<\/code>\u00a0\u6ca1\u6709\u5c5e\u4e8e\u81ea\u5df1\u7684\u8bcd\u6cd5\u73af\u5883\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u4ece\u5916\u90e8\u8bbf\u95ee\u53d8\u91cf\u00a0<code>x<\/code>\u00a0\u548c\u51fd\u6570\u00a0<code>f<\/code>\u3002<\/p>\n<h2>\u4f7f\u7528 eval<\/h2>\n<p>\u73b0\u4ee3\u7f16\u7a0b\u4e2d\uff0c\u5df2\u7ecf\u5f88\u5c11\u4f7f\u7528\u00a0<code>eval<\/code>\u00a0\u4e86\u3002\u4eba\u4eec\u7ecf\u5e38\u8bf4\u201ceval \u662f\u9b54\u9b3c\u201d\u3002<br \/>\n\u539f\u56e0\u5f88\u7b80\u5355\uff1a\u5f88\u4e45\u5f88\u4e45\u4ee5\u524d\uff0cJavaScript \u662f\u4e00\u79cd\u975e\u5e38\u5f31\u7684\u8bed\u8a00\uff0c\u5f88\u591a\u4e1c\u897f\u53ea\u80fd\u901a\u8fc7\u00a0<code>eval<\/code>\u00a0\u6765\u5b8c\u6210\u3002\u4e0d\u8fc7\u90a3\u5df2\u7ecf\u662f\u5341\u5e74\u524d\u7684\u4e8b\u4e86\u3002<br \/>\n\u5982\u4eca\u51e0\u4e4e\u627e\u4e0d\u5230\u4f7f\u7528\u00a0<code>eval<\/code>\u00a0\u7684\u7406\u7531\u4e86\u3002\u5982\u679c\u6709\u4eba\u5728\u4f7f\u7528\u5b83\uff0c\u90a3\u8fd9\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u4f7f\u7528\u73b0\u4ee3\u8bed\u8a00\u7ed3\u6784\u6216\u00a0<a href=\"https:\/\/zh.javascript.info\/modules\">JavaScript Module<\/a>\u00a0\u6765\u66ff\u6362\u5b83\u4eec\u7684\u673a\u4f1a\u3002<br \/>\n\u8bf7\u6ce8\u610f\uff0c<code>eval<\/code>\u00a0\u8bbf\u95ee\u5916\u90e8\u53d8\u91cf\u7684\u80fd\u529b\u4f1a\u4ea7\u751f\u526f\u4f5c\u7528\u3002<br \/>\n\u4ee3\u7801\u538b\u7f29\u5de5\u5177\uff08\u5728\u628a JS \u6295\u5165\u751f\u4ea7\u73af\u5883\u524d\u5bf9\u5176\u8fdb\u884c\u538b\u7f29\u7684\u5de5\u5177\uff09\u5c06\u5c40\u90e8\u53d8\u91cf\u91cd\u547d\u540d\u4e3a\u66f4\u77ed\u7684\u53d8\u91cf\uff08\u4f8b\u5982\u00a0<code>a<\/code>\u00a0\u548c\u00a0<code>b<\/code>\u00a0\u7b49\uff09\uff0c\u4ee5\u4f7f\u4ee3\u7801\u4f53\u79ef\u66f4\u5c0f\u3002\u8fd9\u901a\u5e38\u662f\u5b89\u5168\u7684\uff0c\u4f46\u5728\u4f7f\u7528\u4e86\u00a0<code>eval<\/code>\u00a0\u7684\u60c5\u51b5\u4e0b\u5c31\u4e0d\u4e00\u6837\u4e86\uff0c\u56e0\u4e3a\u5c40\u90e8\u53d8\u91cf\u53ef\u80fd\u4f1a\u88ab\u00a0<code>eval<\/code>\u00a0\u4e2d\u7684\u4ee3\u7801\u8bbf\u95ee\u5230\u3002\u56e0\u6b64\u538b\u7f29\u5de5\u5177\u4e0d\u4f1a\u5bf9\u6240\u6709\u53ef\u80fd\u4f1a\u88ab\u4ece\u00a0<code>eval<\/code>\u00a0\u4e2d\u8bbf\u95ee\u7684\u53d8\u91cf\u8fdb\u884c\u91cd\u547d\u540d\u3002\u8fd9\u6837\u4f1a\u5bfc\u81f4\u4ee3\u7801\u538b\u7f29\u7387\u964d\u4f4e\u3002<br \/>\n\u5728\u00a0<code>eval<\/code>\u00a0\u4e2d\u4f7f\u7528\u5916\u90e8\u5c40\u90e8\u53d8\u91cf\u4e5f\u88ab\u8ba4\u4e3a\u662f\u4e00\u4e2a\u574f\u7684\u7f16\u7a0b\u4e60\u60ef\uff0c\u56e0\u4e3a\u8fd9\u4f1a\u4f7f\u4ee3\u7801\u7ef4\u62a4\u53d8\u5f97\u66f4\u52a0\u56f0\u96be\u3002<br \/>\n\u6709\u4e24\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b8c\u5168\u907f\u514d\u6b64\u7c7b\u95ee\u9898\u3002<br \/>\n<strong>\u5982\u679c\u00a0<code>eval<\/code>\u00a0\u4e2d\u7684\u4ee3\u7801\u6ca1\u6709\u4f7f\u7528\u5916\u90e8\u53d8\u91cf\uff0c\u8bf7\u4ee5\u00a0<code>window.eval(...)<\/code>\u00a0\u7684\u5f62\u5f0f\u8c03\u7528\u00a0<code>eval<\/code>\uff1a<\/strong><br \/>\n\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u8be5\u4ee3\u7801\u4fbf\u4f1a\u5728\u5168\u5c40\u4f5c\u7528\u57df\u5185\u6267\u884c\uff1a<\/p>\n<pre><code class=\"language-js\">let x = 1;\n{\n  let x = 5;\n  window.eval('alert(x)'); \/\/ 1\uff08\u5168\u5c40\u53d8\u91cf\uff09\n}\n<\/code><\/pre>\n<p><strong>\u5982\u679c\u00a0<code>eval<\/code>\u00a0\u4e2d\u7684\u4ee3\u7801\u9700\u8981\u8bbf\u95ee\u5c40\u90e8\u53d8\u91cf\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>new Function<\/code>\u00a0\u66ff\u4ee3\u00a0<code>eval<\/code>\uff0c\u5e76\u5c06\u5b83\u4eec\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff1a<\/strong><\/p>\n<pre><code class=\"language-js\">let f = new Function('a', 'alert(a)');\n\nf(5); \/\/ 5\n<\/code><\/pre>\n<p>\u6211\u4eec\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/new-function\">&quot;new Function&quot; \u8bed\u6cd5<\/a>\u00a0\u4e00\u7ae0\u4e2d\u5bf9\u00a0<code>new Function<\/code>\u00a0\u6784\u9020\u5668\u8fdb\u884c\u4e86\u8be6\u7ec6\u8bf4\u660e\u3002<code>new Function<\/code>\u00a0\u4ece\u5b57\u7b26\u4e32\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\uff0c\u5e76\u4e14\u4e5f\u662f\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684\u3002\u6240\u4ee5\u5b83\u65e0\u6cd5\u8bbf\u95ee\u5c40\u90e8\u53d8\u91cf\u3002\u4f46\u662f\uff0c\u6b63\u5982\u4e0a\u9762\u7684\u793a\u4f8b\u4e00\u6837\uff0c\u5c06\u5b83\u4eec\u4f5c\u4e3a\u53c2\u6570\u8fdb\u884c\u663e\u5f0f\u4f20\u9012\u8981\u6e05\u6670\u5f97\u591a\u3002<\/p>\n<h1>\u67ef\u91cc\u5316 Currying<\/h1>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Currying\">\u67ef\u91cc\u5316\uff08Currying\uff09<\/a>\u662f\u4e00\u79cd\u5173\u4e8e\u51fd\u6570\u7684\u9ad8\u9636\u6280\u672f\u3002\u5b83\u4e0d\u4ec5\u88ab\u7528\u4e8e JavaScript\uff0c\u8fd8\u88ab\u7528\u4e8e\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u3002<br \/>\n\u67ef\u91cc\u5316\u662f\u4e00\u79cd\u51fd\u6570\u7684\u8f6c\u6362\uff0c\u5b83\u662f\u6307\u5c06\u4e00\u4e2a\u51fd\u6570\u4ece\u53ef\u8c03\u7528\u7684\u00a0<code>f(a, b, c)<\/code>\u00a0\u8f6c\u6362\u4e3a\u53ef\u8c03\u7528\u7684\u00a0<code>f(a)(b)(c)<\/code>\u3002<br \/>\n\u67ef\u91cc\u5316\u4e0d\u4f1a\u8c03\u7528\u51fd\u6570\u3002\u5b83\u53ea\u662f\u5bf9\u51fd\u6570\u8fdb\u884c\u8f6c\u6362\u3002<br \/>\n\u8ba9\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\uff0c\u4ee5\u66f4\u597d\u5730\u7406\u89e3\u6211\u4eec\u6b63\u5728\u8bb2\u7684\u5185\u5bb9\uff0c\u7136\u540e\u518d\u8fdb\u884c\u4e00\u4e2a\u5b9e\u9645\u5e94\u7528\u3002<br \/>\n\u6211\u4eec\u5c06\u521b\u5efa\u4e00\u4e2a\u8f85\u52a9\u51fd\u6570\u00a0<code>curry(f)<\/code>\uff0c\u8be5\u51fd\u6570\u5c06\u5bf9\u4e24\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u00a0<code>f<\/code>\u00a0\u6267\u884c\u67ef\u91cc\u5316\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5bf9\u4e8e\u4e24\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u00a0<code>f(a, b)<\/code>\u00a0\u6267\u884c\u00a0<code>curry(f)<\/code>\u00a0\u4f1a\u5c06\u5176\u8f6c\u6362\u4e3a\u4ee5\u00a0<code>f(a)(b)<\/code>\u00a0\u5f62\u5f0f\u8fd0\u884c\u7684\u51fd\u6570\uff1a<\/p>\n<pre><code class=\"language-js\">function curry(f) { \/\/ curry(f) \u6267\u884c\u67ef\u91cc\u5316\u8f6c\u6362\n  return function(a) {\n    return function(b) {\n      return f(a, b);\n    };\n  };\n}\n\n\/\/ \u7528\u6cd5\nfunction sum(a, b) {\n  return a + b;\n}\n\nlet curriedSum = curry(sum);\n\nalert( curriedSum(1)(2) ); \/\/ 3\n<\/code><\/pre>\n<p>\u6b63\u5982\u4f60\u6240\u770b\u5230\u7684\uff0c\u5b9e\u73b0\u975e\u5e38\u7b80\u5355\uff1a\u53ea\u6709\u4e24\u4e2a\u5305\u88c5\u5668\uff08wrapper\uff09\u3002<\/p>\n<ul>\n<li><code>curry(func)<\/code>\u00a0\u7684\u7ed3\u679c\u5c31\u662f\u4e00\u4e2a\u5305\u88c5\u5668\u00a0<code>function(a)<\/code>\u3002<\/li>\n<li>\u5f53\u5b83\u88ab\u50cf\u00a0<code>curriedSum(1)<\/code>\u00a0\u8fd9\u6837\u8c03\u7528\u65f6\uff0c\u5b83\u7684\u53c2\u6570\u4f1a\u88ab\u4fdd\u5b58\u5728\u8bcd\u6cd5\u73af\u5883\u4e2d\uff0c\u7136\u540e\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5305\u88c5\u5668\u00a0<code>function(b)<\/code>\u3002<\/li>\n<li>\u7136\u540e\u8fd9\u4e2a\u5305\u88c5\u5668\u88ab\u4ee5\u00a0<code>2<\/code>\u00a0\u4e3a\u53c2\u6570\u8c03\u7528\uff0c\u5e76\u4e14\uff0c\u5b83\u5c06\u8be5\u8c03\u7528\u4f20\u9012\u7ed9\u539f\u59cb\u7684\u00a0<code>sum<\/code>\u00a0\u51fd\u6570\u3002<br \/>\n\u67ef\u91cc\u5316\u66f4\u9ad8\u7ea7\u7684\u5b9e\u73b0\uff0c\u4f8b\u5982 lodash \u5e93\u7684\u00a0<a href=\"https:\/\/lodash.com\/docs#curry\">_.curry<\/a>\uff0c\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u88c5\u5668\uff0c\u8be5\u5305\u88c5\u5668\u5141\u8bb8\u51fd\u6570\u88ab\u6b63\u5e38\u8c03\u7528\u6216\u8005\u4ee5\u90e8\u5206\u5e94\u7528\u51fd\u6570\uff08partial\uff09\u7684\u65b9\u5f0f\u8c03\u7528\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">function sum(a, b) {\n  return a + b;\n}\n\nlet curriedSum = _.curry(sum); \/\/ \u4f7f\u7528\u6765\u81ea lodash \u5e93\u7684 _.curry\n\nalert( curriedSum(1, 2) ); \/\/ 3\uff0c\u4ecd\u53ef\u6b63\u5e38\u8c03\u7528\nalert( curriedSum(1)(2) ); \/\/ 3\uff0c\u4ee5\u90e8\u5206\u5e94\u7528\u51fd\u6570\u7684\u65b9\u5f0f\u8c03\u7528\n<\/code><\/pre>\n<h2>\u67ef\u91cc\u5316\uff1f\u76ee\u7684\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>\u8981\u4e86\u89e3\u5b83\u7684\u597d\u5904\uff0c\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u5b9e\u9645\u4e2d\u7684\u4f8b\u5b50\u3002<br \/>\n\u4f8b\u5982\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u7528\u4e8e\u683c\u5f0f\u5316\u548c\u8f93\u51fa\u4fe1\u606f\u7684\u65e5\u5fd7\uff08logging\uff09\u51fd\u6570\u00a0<code>log(date, importance, message)<\/code>\u3002\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u6b64\u7c7b\u51fd\u6570\u5177\u6709\u5f88\u591a\u6709\u7528\u7684\u529f\u80fd\uff0c\u4f8b\u5982\u901a\u8fc7\u7f51\u7edc\u53d1\u9001\u65e5\u5fd7\uff08log\uff09\uff0c\u5728\u8fd9\u513f\u6211\u4eec\u4ec5\u4f7f\u7528\u00a0<code>alert<\/code>\uff1a<\/p>\n<pre><code class=\"language-js\">function log(date, importance, message) {\n  alert(`[${date.getHours()}:${date.getMinutes()}] [${importance}] ${message}`);\n}\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u5c06\u5b83\u67ef\u91cc\u5316\uff01<\/p>\n<pre><code class=\"language-js\">log = _.curry(log);\n<\/code><\/pre>\n<p>\u67ef\u91cc\u5316\u4e4b\u540e\uff0c<code>log<\/code>\u00a0\u4ecd\u6b63\u5e38\u8fd0\u884c\uff1a<\/p>\n<pre><code class=\"language-js\">log(new Date(), &quot;DEBUG&quot;, &quot;some debug&quot;); \/\/ log(a, b, c)\n<\/code><\/pre>\n<p>\u2026\u2026\u4f46\u662f\u4e5f\u53ef\u4ee5\u4ee5\u67ef\u91cc\u5316\u5f62\u5f0f\u8fd0\u884c\uff1a<\/p>\n<pre><code class=\"language-js\">log(new Date())(&quot;DEBUG&quot;)(&quot;some debug&quot;); \/\/ log(a)(b)(c)\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u4e3a\u5f53\u524d\u65e5\u5fd7\u521b\u5efa\u4fbf\u6377\u51fd\u6570\uff1a<\/p>\n<pre><code class=\"language-js\">\/\/ logNow \u4f1a\u662f\u5e26\u6709\u56fa\u5b9a\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684\u65e5\u5fd7\u7684\u90e8\u5206\u5e94\u7528\u51fd\u6570\nlet logNow = log(new Date());\n\n\/\/ \u4f7f\u7528\u5b83\nlogNow(&quot;INFO&quot;, &quot;message&quot;); \/\/ [HH:mm] INFO message\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c<code>logNow<\/code>\u00a0\u662f\u5177\u6709\u56fa\u5b9a\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684\u00a0<code>log<\/code>\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u5c31\u662f\u66f4\u7b80\u77ed\u7684\u201c\u90e8\u5206\u5e94\u7528\u51fd\u6570\uff08partially applied function\uff09\u201d\u6216\u201c\u90e8\u5206\u51fd\u6570\uff08partial\uff09\u201d\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u66f4\u8fdb\u4e00\u6b65\uff0c\u4e3a\u5f53\u524d\u7684\u8c03\u8bd5\u65e5\u5fd7\uff08debug log\uff09\u63d0\u4f9b\u4fbf\u6377\u51fd\u6570\uff1a<\/p>\n<pre><code class=\"language-js\">let debugNow = logNow(&quot;DEBUG&quot;);\n\ndebugNow(&quot;message&quot;); \/\/ [HH:mm] DEBUG message\n<\/code><\/pre>\n<p>\u6240\u4ee5\uff1a<\/p>\n<ol>\n<li>\u67ef\u91cc\u5316\u4e4b\u540e\uff0c\u6211\u4eec\u6ca1\u6709\u4e22\u5931\u4efb\u4f55\u4e1c\u897f\uff1a<code>log<\/code>\u00a0\u4f9d\u7136\u53ef\u4ee5\u88ab\u6b63\u5e38\u8c03\u7528\u3002<\/li>\n<li>\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u751f\u6210\u90e8\u5206\u5e94\u7528\u51fd\u6570\uff0c\u4f8b\u5982\u7528\u4e8e\u751f\u6210\u4eca\u5929\u7684\u65e5\u5fd7\u7684\u90e8\u5206\u5e94\u7528\u51fd\u6570\u3002<\/li>\n<\/ol>\n<h2>\u9ad8\u7ea7\u67ef\u91cc\u5316\u5b9e\u73b0<\/h2>\n<p>\u5982\u679c\u4f60\u60f3\u4e86\u89e3\u66f4\u591a\u7ec6\u8282\uff0c\u4e0b\u9762\u662f\u7528\u4e8e\u591a\u53c2\u6570\u51fd\u6570\u7684\u201c\u9ad8\u7ea7\u201d\u67ef\u91cc\u5316\u5b9e\u73b0\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u628a\u5b83\u7528\u4e8e\u4e0a\u9762\u7684\u793a\u4f8b\u3002<br \/>\n\u5b83\u975e\u5e38\u77ed\uff1a<\/p>\n<pre><code class=\"language-js\">function curry(func) {\n\n  return function curried(...args) {\n    if (args.length &gt;= func.length) {\n      return func.apply(this, args);\n    } else {\n      return function(...args2) {\n        return curried.apply(this, args.concat(args2));\n      }\n    }\n  };\n\n}\n<\/code><\/pre>\n<p>\u7528\u4f8b\uff1a<\/p>\n<pre><code class=\"language-js\">function sum(a, b, c) {\n  return a + b + c;\n}\n\nlet curriedSum = curry(sum);\n\nalert( curriedSum(1, 2, 3) ); \/\/ 6\uff0c\u4ecd\u7136\u53ef\u4ee5\u88ab\u6b63\u5e38\u8c03\u7528\nalert( curriedSum(1)(2,3) ); \/\/ 6\uff0c\u5bf9\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684\u67ef\u91cc\u5316\nalert( curriedSum(1)(2)(3) ); \/\/ 6\uff0c\u5168\u67ef\u91cc\u5316\n<\/code><\/pre>\n<p>\u65b0\u7684\u00a0<code>curry<\/code>\u00a0\u53ef\u80fd\u770b\u4e0a\u53bb\u6709\u70b9\u590d\u6742\uff0c\u4f46\u662f\u5b83\u5f88\u5bb9\u6613\u7406\u89e3\u3002<br \/>\n<code>curry(func)<\/code>\u00a0\u8c03\u7528\u7684\u7ed3\u679c\u662f\u5982\u4e0b\u6240\u793a\u7684\u5305\u88c5\u5668\u00a0<code>curried<\/code>\uff1a<\/p>\n<pre><code class=\"language-js\">\/\/ func \u662f\u8981\u8f6c\u6362\u7684\u51fd\u6570\nfunction curried(...args) {\n  if (args.length &gt;= func.length) { \/\/ (1)\n    return func.apply(this, args);\n  } else {\n    return function(...args2) { \/\/ (2)\n      return curried.apply(this, args.concat(args2));\n    }\n  }\n};\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u5b83\u65f6\uff0c\u8fd9\u91cc\u6709\u4e24\u4e2a\u00a0<code>if<\/code>\u00a0\u6267\u884c\u5206\u652f\uff1a<\/p>\n<ol>\n<li>\u5982\u679c\u4f20\u5165\u7684\u00a0<code>args<\/code>\u00a0\u957f\u5ea6\u4e0e\u539f\u59cb\u51fd\u6570\u6240\u5b9a\u4e49\u7684\uff08<code>func.length<\/code>\uff09\u76f8\u540c\u6216\u8005\u66f4\u957f\uff0c\u90a3\u4e48\u53ea\u9700\u8981\u4f7f\u7528\u00a0<code>func.apply<\/code>\u00a0\u5c06\u8c03\u7528\u4f20\u9012\u7ed9\u5b83\u5373\u53ef\u3002<\/li>\n<li>\u5426\u5219\uff0c\u83b7\u53d6\u4e00\u4e2a\u90e8\u5206\u5e94\u7528\u51fd\u6570\uff1a\u6211\u4eec\u76ee\u524d\u8fd8\u6ca1\u8c03\u7528\u00a0<code>func<\/code>\u3002\u53d6\u800c\u4ee3\u4e4b\u7684\u662f\uff0c\u8fd4\u56de\u53e6\u4e00\u4e2a\u5305\u88c5\u5668\u00a0<code>pass<\/code>\uff0c\u5b83\u5c06\u91cd\u65b0\u5e94\u7528\u00a0<code>curried<\/code>\uff0c\u5c06\u4e4b\u524d\u4f20\u5165\u7684\u53c2\u6570\u4e0e\u65b0\u7684\u53c2\u6570\u4e00\u8d77\u4f20\u5165\u3002<br \/>\n\u7136\u540e\uff0c\u5982\u679c\u6211\u4eec\u518d\u6b21\u8c03\u7528\u5b83\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u4e00\u4e2a\u65b0\u7684\u90e8\u5206\u5e94\u7528\u51fd\u6570\uff08\u5982\u679c\u6ca1\u6709\u8db3\u591f\u7684\u53c2\u6570\uff09\uff0c\u6216\u8005\u6700\u7ec8\u7684\u7ed3\u679c\u3002<\/li>\n<\/ol>\n<blockquote>\n<p>\u53ea\u5141\u8bb8\u786e\u5b9a\u53c2\u6570\u957f\u5ea6\u7684\u51fd\u6570<br \/>\n\u67ef\u91cc\u5316\u8981\u6c42\u51fd\u6570\u5177\u6709\u56fa\u5b9a\u6570\u91cf\u7684\u53c2\u6570\u3002<br \/>\n\u4f7f\u7528 rest \u53c2\u6570\u7684\u51fd\u6570\uff0c\u4f8b\u5982\u00a0<code>f(...args)<\/code>\uff0c\u4e0d\u80fd\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u8fdb\u884c\u67ef\u91cc\u5316\u3002<\/p>\n<\/blockquote>\n<blockquote>\n<p>\u6bd4\u67ef\u91cc\u5316\u591a\u4e00\u70b9<br \/>\n\u6839\u636e\u5b9a\u4e49\uff0c\u67ef\u91cc\u5316\u5e94\u8be5\u5c06\u00a0<code>sum(a, b, c)<\/code>\u00a0\u8f6c\u6362\u4e3a\u00a0<code>sum(a)(b)(c)<\/code>\u3002<br \/>\n\u4f46\u662f\uff0c\u5982\u524d\u6240\u8ff0\uff0cJavaScript \u4e2d\u5927\u591a\u6570\u7684\u67ef\u91cc\u5316\u5b9e\u73b0\u90fd\u662f\u9ad8\u7ea7\u7248\u7684\uff1a\u5b83\u4eec\u4f7f\u5f97\u51fd\u6570\u53ef\u4ee5\u88ab\u591a\u53c2\u6570\u53d8\u4f53\u8c03\u7528\u3002<\/p>\n<\/blockquote>\n<h1>Reference Type<\/h1>\n<blockquote>\n<p>\u6df1\u5165\u7684\u8bed\u8a00\u7279\u6027<br \/>\n\u672c\u6587\u6240\u8bb2\u7684\u662f\u4e00\u4e2a\u9ad8\u9636\u4e3b\u9898\uff0c\u80fd\u5e2e\u4f60\u66f4\u597d\u5730\u7406\u89e3\u4e00\u4e9b\u8fb9\u7f18\u60c5\u51b5\u3002<br \/>\n\u8fd9\u4ec5\u662f\u9526\u4e0a\u6dfb\u82b1\u3002\u8bb8\u591a\u7ecf\u9a8c\u4e30\u5bcc\u7684\u5f00\u53d1\u8005\u4e0d\u751a\u4e86\u4e86\u4e5f\u8fc7\u5f97\u4e0d\u9519\u3002\u5982\u679c\u4f60\u60f3\u4e86\u89e3\u4ee3\u7801\u8fd0\u884c\u7684\u672c\u8d28\uff0c\u90a3\u5c31\u7ee7\u7eed\u8bfb\u4e0b\u53bb\u5427\u3002<\/p>\n<\/blockquote>\n<p>\u4e00\u4e2a\u52a8\u6001\u6267\u884c\u7684\u65b9\u6cd5\u8c03\u7528\u53ef\u80fd\u4f1a\u4e22\u5931\u00a0<code>this<\/code>\u3002<br \/>\n\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-js\">let user = {\n  name: &quot;John&quot;,\n  hi() { alert(this.name); },\n  bye() { alert(&quot;Bye&quot;); }\n};\n\nuser.hi(); \/\/ \u6b63\u5e38\u8fd0\u884c\n\n\/\/ \u73b0\u5728\u8ba9\u6211\u4eec\u57fa\u4e8e name \u6765\u9009\u62e9\u8c03\u7528 user.hi \u6216 user.bye\n(user.name == &quot;John&quot; ? user.hi : user.bye)(); \/\/ Error!\n<\/code><\/pre>\n<p>\u5728\u6700\u540e\u4e00\u884c\u6709\u4e2a\u5728\u00a0<code>user.hi<\/code>\u00a0\u548c\u00a0<code>user.bye<\/code>\u00a0\u4e2d\u505a\u9009\u62e9\u7684\u6761\u4ef6\uff08\u4e09\u5143\uff09\u8fd0\u7b97\u7b26\u3002\u5f53\u524d\u60c5\u5f62\u4e0b\u7684\u7ed3\u679c\u662f\u00a0<code>user.hi<\/code>\u3002<br \/>\n\u63a5\u7740\u8be5\u65b9\u6cd5\u88ab\u901a\u8fc7\u00a0<code>()<\/code>\u00a0\u7acb\u523b\u8c03\u7528\u3002\u4f46\u662f\u5e76\u4e0d\u80fd\u6b63\u5e38\u5de5\u4f5c\uff01<br \/>\n\u5982\u4f60\u6240\u89c1\uff0c\u6b64\u5904\u8c03\u7528\u5bfc\u81f4\u4e86\u4e00\u4e2a\u9519\u8bef\uff0c\u56e0\u4e3a\u5728\u8be5\u8c03\u7528\u4e2d\u00a0<code>&quot;this&quot;<\/code>\u00a0\u7684\u503c\u53d8\u6210\u4e86\u00a0<code>undefined<\/code>\u3002<br \/>\n\u8fd9\u6837\u662f\u80fd\u5de5\u4f5c\u7684\uff08\u5bf9\u8c61.\u65b9\u6cd5\uff09\uff1a<\/p>\n<pre><code class=\"language-js\">user.hi();\n<\/code><\/pre>\n<p>\u8fd9\u5c31\u65e0\u6cd5\u5de5\u4f5c\u4e86\uff08\u88ab\u8bc4\u4f30\u7684\u65b9\u6cd5\uff09\uff1a<\/p>\n<pre><code class=\"language-js\">(user.name == &quot;John&quot; ? user.hi : user.bye)(); \/\/ Error!\n<\/code><\/pre>\n<p>\u4e3a\u4ec0\u4e48\u5462\uff1f\u6b32\u77e5\u7f18\u4f55\uff0c\u4e14\u8ba9\u6211\u4eec\u6df1\u5165\u00a0<code>obj.method()<\/code>\u00a0\u8c03\u7528\u8fd0\u884c\u7684\u672c\u8d28\u3002<\/p>\n<h2>Reference type \u89e3\u8bfb<\/h2>\n<p>\u4ed4\u7ec6\u770b\u7684\u8bdd\uff0c\u6211\u4eec\u53ef\u80fd\u6ce8\u610f\u5230\u00a0<code>obj.method()<\/code>\u00a0\u8bed\u53e5\u4e2d\u7684\u4e24\u4e2a\u64cd\u4f5c\uff1a<\/p>\n<ol>\n<li>\u9996\u5148\uff0c\u70b9\u00a0<code>'.'<\/code>\u00a0\u53d6\u4e86\u5c5e\u6027\u00a0<code>obj.method<\/code>\u00a0\u7684\u503c\u3002<\/li>\n<li>\u63a5\u7740\u00a0<code>()<\/code>\u00a0\u6267\u884c\u4e86\u5b83\u3002<br \/>\n\u90a3\u4e48\uff0c<code>this<\/code>\u00a0\u7684\u4fe1\u606f\u662f\u600e\u4e48\u4ece\u7b2c\u4e00\u90e8\u5206\u4f20\u9012\u5230\u7b2c\u4e8c\u90e8\u5206\u7684\u5462\uff1f<br \/>\n\u5982\u679c\u6211\u4eec\u5c06\u8fd9\u4e9b\u64cd\u4f5c\u653e\u5728\u4e0d\u540c\u7684\u884c\uff0c<code>this<\/code>\u00a0\u5fc5\u5b9a\u662f\u4f1a\u4e22\u5931\u7684\uff1a<\/li>\n<\/ol>\n<pre><code class=\"language-js\">let user = {\n  name: &quot;John&quot;,\n  hi() { alert(this.name); }\n};\n\n\/\/ \u628a\u83b7\u53d6\u65b9\u6cd5\u548c\u8c03\u7528\u65b9\u6cd5\u62c6\u6210\u4e24\u884c\nlet hi = user.hi;\nhi(); \/\/ \u62a5\u9519\u4e86\uff0c\u56e0\u4e3a this \u7684\u503c\u662f undefined\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u00a0<code>hi = user.hi<\/code>\u00a0\u628a\u51fd\u6570\u8d4b\u503c\u7ed9\u4e86\u4e00\u4e2a\u53d8\u91cf\uff0c\u63a5\u4e0b\u6765\u5728\u6700\u540e\u4e00\u884c\u5b83\u662f\u5b8c\u5168\u72ec\u7acb\u7684\uff0c\u6240\u4ee5\u8fd9\u91cc\u6ca1\u6709\u00a0<code>this<\/code>\u3002<br \/>\n<strong>\u4e3a\u786e\u4fdd\u00a0<code>user.hi()<\/code>\u00a0\u8c03\u7528\u6b63\u5e38\u8fd0\u884c\uff0cJavaScript \u73a9\u4e86\u4e2a\u5c0f\u628a\u620f \u2014\u2014 \u70b9\u00a0<code>'.'<\/code>\u00a0\u8fd4\u56de\u7684\u4e0d\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u800c\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u00a0<a href=\"https:\/\/tc39.github.io\/ecma262\/#sec-reference-specification-type\">Reference Type<\/a>\u00a0\u7684\u503c\u3002<\/strong><br \/>\nReference Type \u662f ECMA \u4e2d\u7684\u4e00\u4e2a\u201c\u89c4\u8303\u7c7b\u578b\u201d\u3002\u6211\u4eec\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u5b83\uff0c\u4f46\u5b83\u88ab\u7528\u5728 JavaScript \u8bed\u8a00\u5185\u90e8\u3002<br \/>\nReference Type \u7684\u503c\u662f\u4e00\u4e2a\u4e09\u4e2a\u503c\u7684\u7ec4\u5408\u00a0<code>(base, name, strict)<\/code>\uff0c\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li><code>base<\/code>\u00a0\u662f\u5bf9\u8c61\u3002<\/li>\n<li><code>name<\/code>\u00a0\u662f\u5c5e\u6027\u540d\u3002<\/li>\n<li><code>strict<\/code>\u00a0\u5728\u00a0<code>use strict<\/code>\u00a0\u6a21\u5f0f\u4e0b\u4e3a true\u3002<br \/>\n\u5bf9\u5c5e\u6027\u00a0<code>user.hi<\/code>\u00a0\u8bbf\u95ee\u7684\u7ed3\u679c\u4e0d\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u800c\u662f\u4e00\u4e2a Reference Type \u7684\u503c\u3002\u5bf9\u4e8e\u00a0<code>user.hi<\/code>\uff0c\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\u662f\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">\/\/ Reference Type \u7684\u503c\n(user, &quot;hi&quot;, true)\n<\/code><\/pre>\n<p>\u5f53\u00a0<code>()<\/code>\u00a0\u88ab\u5728 Reference Type \u4e0a\u8c03\u7528\u65f6\uff0c\u5b83\u4eec\u4f1a\u63a5\u6536\u5230\u5173\u4e8e\u5bf9\u8c61\u548c\u5bf9\u8c61\u7684\u65b9\u6cd5\u7684\u5b8c\u6574\u4fe1\u606f\uff0c\u7136\u540e\u53ef\u4ee5\u8bbe\u7f6e\u6b63\u786e\u7684\u00a0<code>this<\/code>\uff08\u5728\u6b64\u5904\u00a0<code>=user<\/code>\uff09\u3002<br \/>\nReference Type \u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u201c\u4e2d\u95f4\u4eba\u201d\u5185\u90e8\u7c7b\u578b\uff0c\u76ee\u7684\u662f\u4ece\u00a0<code>.<\/code>\u00a0\u4f20\u9012\u4fe1\u606f\u7ed9\u00a0<code>()<\/code>\u00a0\u8c03\u7528\u3002<br \/>\n\u4efb\u4f55\u4f8b\u5982\u8d4b\u503c\u00a0<code>hi = user.hi<\/code>\u00a0\u7b49\u5176\u4ed6\u7684\u64cd\u4f5c\uff0c\u90fd\u4f1a\u5c06 Reference Type \u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53\u4e22\u5f03\u6389\uff0c\u800c\u4f1a\u53d6\u00a0<code>user.hi<\/code>\uff08\u4e00\u4e2a\u51fd\u6570\uff09\u7684\u503c\u5e76\u7ee7\u7eed\u4f20\u9012\u3002\u6240\u4ee5\u4efb\u4f55\u540e\u7eed\u64cd\u4f5c\u90fd\u201c\u4e22\u5931\u201d\u4e86\u00a0<code>this<\/code>\u3002<br \/>\n\u56e0\u6b64\uff0c<code>this<\/code>\u00a0\u7684\u503c\u4ec5\u5728\u51fd\u6570\u76f4\u63a5\u88ab\u901a\u8fc7\u70b9\u7b26\u53f7\u00a0<code>obj.method()<\/code>\u00a0\u6216\u65b9\u62ec\u53f7\u00a0<code>obj['method']()<\/code>\u00a0\u8bed\u6cd5\uff08\u6b64\u5904\u5b83\u4eec\u4f5c\u7528\u76f8\u540c\uff09\u8c03\u7528\u65f6\u624d\u88ab\u6b63\u786e\u4f20\u9012\u3002\u8fd8\u6709\u5f88\u591a\u79cd\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u5f0f\uff0c\u4f8b\u5982\u00a0<a href=\"https:\/\/zh.javascript.info\/bind#solution-2-bind\">func.bind()<\/a>\u3002<\/p>\n<h1>BigInt<\/h1>\n<blockquote>\n<p>\u6700\u8fd1\u65b0\u589e\u7684\u7279\u6027<br \/>\n\u8fd9\u662f\u4e00\u4e2a\u6700\u8fd1\u6dfb\u52a0\u5230 JavaScript \u7684\u7279\u6027\u3002 \u4f60\u80fd\u5728\u00a0<a href=\"https:\/\/caniuse.com\/#feat=bigint\">https:\/\/caniuse.com\/#feat=bigint<\/a>\u00a0\u627e\u5230\u5f53\u524d\u652f\u6301\u72b6\u6001\u3002<\/p>\n<\/blockquote>\n<p><code>BigInt<\/code>\u00a0\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6570\u5b57\u7c7b\u578b\uff0c\u5b83\u63d0\u4f9b\u4e86\u5bf9\u4efb\u610f\u957f\u5ea6\u6574\u6570\u7684\u652f\u6301\u3002<br \/>\n\u521b\u5efa bigint \u7684\u65b9\u5f0f\u6709\u4e24\u79cd\uff1a\u5728\u4e00\u4e2a\u6574\u6570\u5b57\u9762\u91cf\u540e\u9762\u52a0\u00a0<code>n<\/code>\u00a0\u6216\u8005\u8c03\u7528\u00a0<code>BigInt<\/code>\u00a0\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u4ece\u5b57\u7b26\u4e32\u3001\u6570\u5b57\u7b49\u4e2d\u751f\u6210 bigint\u3002<\/p>\n<pre><code class=\"language-js\">const bigint = 1234567890123456789012345678901234567890n;\n\nconst sameBigint = BigInt(&quot;1234567890123456789012345678901234567890&quot;);\n\nconst bigintFromNumber = BigInt(10); \/\/ \u4e0e 10n \u76f8\u540c\n<\/code><\/pre>\n<h2>\u6570\u5b66\u8fd0\u7b97\u7b26<\/h2>\n<p><code>BigInt<\/code>\u00a0\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u53ef\u4ee5\u50cf\u5e38\u89c4\u6570\u5b57\u7c7b\u578b\u4e00\u6837\u4f7f\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-js\">alert(1n + 2n); \/\/ 3\n\nalert(5n \/ 2n); \/\/ 2\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff1a\u9664\u6cd5\u00a0<code>5\/2<\/code>\u00a0\u7684\u7ed3\u679c\u5411\u96f6\u8fdb\u884c\u820d\u5165\uff0c\u820d\u5165\u540e\u5f97\u5230\u7684\u7ed3\u679c\u6ca1\u6709\u4e86\u5c0f\u6570\u90e8\u5206\u3002\u5bf9 bigint \u7684\u6240\u6709\u64cd\u4f5c\uff0c\u8fd4\u56de\u7684\u7ed3\u679c\u4e5f\u662f bigint\u3002<br \/>\n\u6211\u4eec\u4e0d\u53ef\u4ee5\u628a bigint \u548c\u5e38\u89c4\u6570\u5b57\u7c7b\u578b\u6df7\u5408\u4f7f\u7528\uff1a<\/p>\n<pre><code class=\"language-js\">alert(1n + 2); \/\/ Error: Cannot mix BigInt and other types\n<\/code><\/pre>\n<p>\u5982\u679c\u6709\u9700\u8981\uff0c\u6211\u4eec\u5e94\u8be5\u663e\u5f0f\u5730\u8f6c\u6362\u5b83\u4eec\uff1a\u4f7f\u7528\u00a0<code>BigInt()<\/code>\u00a0\u6216\u8005\u00a0<code>Number()<\/code>\uff0c\u50cf\u8fd9\u6837\uff1a<\/p>\n<pre><code class=\"language-js\">let bigint = 1n;\nlet number = 2;\n\n\/\/ \u5c06 number \u8f6c\u6362\u4e3a bigint\nalert(bigint + BigInt(number)); \/\/ 3\n\n\/\/ \u5c06 bigint \u8f6c\u6362\u4e3a number\nalert(Number(bigint) + number); \/\/ 3\n<\/code><\/pre>\n<p>\u8f6c\u6362\u64cd\u4f5c\u59cb\u7ec8\u662f\u9759\u9ed8\u7684\uff0c\u7edd\u4e0d\u4f1a\u62a5\u9519\uff0c\u4f46\u662f\u5982\u679c bigint \u592a\u5927\u800c\u6570\u5b57\u7c7b\u578b\u65e0\u6cd5\u5bb9\u7eb3\uff0c\u5219\u4f1a\u622a\u65ad\u591a\u4f59\u7684\u4f4d\uff0c\u56e0\u6b64\u6211\u4eec\u5e94\u8be5\u8c28\u614e\u8fdb\u884c\u6b64\u7c7b\u8f6c\u6362\u3002<\/p>\n<blockquote>\n<p>BigInt \u4e0d\u652f\u6301\u4e00\u5143\u52a0\u6cd5<br \/>\n\u4e00\u5143\u52a0\u6cd5\u8fd0\u7b97\u7b26\u00a0<code>+value<\/code>\uff0c\u662f\u5927\u5bb6\u719f\u77e5\u7684\u5c06\u00a0<code>value<\/code>\u00a0\u8f6c\u6362\u6210\u6570\u5b57\u7c7b\u578b\u7684\u65b9\u6cd5\u3002<br \/>\n\u4e3a\u4e86\u907f\u514d\u6df7\u6dc6\uff0c\u5728 bigint \u4e2d\u4e0d\u652f\u6301\u4e00\u5143\u52a0\u6cd5\uff1a<\/p>\n<\/blockquote>\n<pre><code class=\"language-js\">let bigint = 1n;\n\nalert( +bigint ); \/\/ error\n<\/code><\/pre>\n<blockquote>\n<p>\u6240\u4ee5\u6211\u4eec\u5e94\u8be5\u7528\u00a0<code>Number()<\/code>\u00a0\u6765\u5c06\u4e00\u4e2a bigint \u8f6c\u6362\u6210\u4e00\u4e2a\u6570\u5b57\u7c7b\u578b\u3002<\/p>\n<\/blockquote>\n<h2>\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h2>\n<p>\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff0c\u4f8b\u5982\u00a0<code>&lt;<\/code>\u00a0\u548c\u00a0<code>&gt;<\/code>\uff0c\u4f7f\u7528\u5b83\u4eec\u6765\u5bf9 bigint \u548c number \u7c7b\u578b\u7684\u6570\u5b57\u8fdb\u884c\u6bd4\u8f83\u6ca1\u6709\u95ee\u9898\uff1a<\/p>\n<pre><code class=\"language-js\">alert( 2n &gt; 1n ); \/\/ true\n\nalert( 2n &gt; 1 ); \/\/ true\n<\/code><\/pre>\n<p>\u4f46\u662f\u8bf7\u6ce8\u610f\uff0c\u7531\u4e8e number \u548c bigint \u5c5e\u4e8e\u4e0d\u540c\u7c7b\u578b\uff0c\u5b83\u4eec\u53ef\u80fd\u5728\u8fdb\u884c\u00a0<code>==<\/code>\u00a0\u6bd4\u8f83\u65f6\u76f8\u7b49\uff0c\u4f46\u5728\u8fdb\u884c\u00a0<code>===<\/code>\uff08\u4e25\u683c\u76f8\u7b49\uff09\u6bd4\u8f83\u65f6\u4e0d\u76f8\u7b49\uff1a<\/p>\n<pre><code class=\"language-js\">alert( 1 == 1n ); \/\/ true\n\nalert( 1 === 1n ); \/\/ false\n<\/code><\/pre>\n<h2>\u5e03\u5c14\u8fd0\u7b97<\/h2>\n<p>\u5f53\u5728\u00a0<code>if<\/code>\u00a0\u6216\u5176\u4ed6\u5e03\u5c14\u8fd0\u7b97\u4e2d\u65f6\uff0cbigint \u7684\u884c\u4e3a\u7c7b\u4f3c\u4e8e number\u3002<br \/>\n\u4f8b\u5982\uff0c\u5728\u00a0<code>if<\/code>\u00a0\u4e2d\uff0cbigint\u00a0<code>0n<\/code>\u00a0\u4e3a\u5047\uff0c\u5176\u4ed6\u503c\u4e3a\u00a0<code>true<\/code>\uff1a<\/p>\n<pre><code class=\"language-js\">if (0n) {\n  \/\/ \u6c38\u8fdc\u4e0d\u4f1a\u6267\u884c\n}\n<\/code><\/pre>\n<p>\u5e03\u5c14\u8fd0\u7b97\u7b26\uff0c\u4f8b\u5982\u00a0<code>||<\/code>\uff0c<code>&amp;&amp;<\/code>\u00a0\u548c\u5176\u4ed6\u8fd0\u7b97\u7b26\uff0c\u5904\u7406 bigint \u7684\u65b9\u5f0f\u4e5f\u7c7b\u4f3c\u4e8e number\uff1a<\/p>\n<pre><code class=\"language-js\">alert( 1n || 2 ); \/\/ 1\uff081n \u88ab\u8ba4\u4e3a\u662f\u771f\uff09\n\nalert( 0n || 2 ); \/\/ 2\uff080n \u88ab\u8ba4\u4e3a\u662f\u5047\uff09\n<\/code><\/pre>\n<h2>Polyfill<\/h2>\n<p>Polyfilling bigint \u6bd4\u8f83\u68d8\u624b\u3002\u539f\u56e0\u662f\u8bb8\u591a JavaScript \u8fd0\u7b97\u7b26\uff0c\u6bd4\u5982\u00a0<code>+<\/code>\u00a0\u548c\u00a0<code>-<\/code>\u00a0\u7b49\uff0c\u5728\u5bf9\u5f85 bigint \u7684\u884c\u4e3a\u4e0a\u4e0e\u5e38\u89c4 number \u76f8\u6bd4\u6709\u6240\u4e0d\u540c\u3002<br \/>\n\u4f8b\u5982\uff0cbigint \u7684\u9664\u6cd5\u603b\u662f\u8fd4\u56de bigint\uff08\u5982\u679c\u9700\u8981\uff0c\u4f1a\u8fdb\u884c\u820d\u5165\uff09\u3002<br \/>\n\u60f3\u8981\u6a21\u62df\u8fd9\u79cd\u884c\u4e3a\uff0cpolyfill \u9700\u8981\u5206\u6790\u4ee3\u7801\uff0c\u5e76\u7528\u5176\u51fd\u6570\u66ff\u6362\u6240\u6709\u6b64\u7c7b\u8fd0\u7b97\u7b26\u3002\u4f46\u662f\u8fd9\u6837\u505a\u5f88\u9ebb\u70e6\uff0c\u5e76\u4e14\u4f1a\u8017\u8d39\u5f88\u591a\u6027\u80fd\u3002<br \/>\n\u6240\u4ee5\uff0c\u76ee\u524d\u5e76\u6ca1\u6709\u4e00\u4e2a\u4f17\u6240\u5468\u77e5\u7684\u597d\u7528\u7684 polyfill\u3002<br \/>\n\u4e0d\u8fc7\uff0c<a href=\"https:\/\/github.com\/GoogleChromeLabs\/jsbi\">JSBI<\/a>\u00a0\u5e93\u7684\u5f00\u53d1\u8005\u63d0\u51fa\u4e86\u53e6\u4e00\u79cd\u89e3\u51b3\u65b9\u6848\u3002<br \/>\n\u8be5\u5e93\u4f7f\u7528\u81ea\u5df1\u7684\u65b9\u6cd5\u5b9e\u73b0\u4e86\u5927\u7684\u6570\u5b57\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u66ff\u4ee3\u539f\u751f\u7684 bigint\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u8fd0\u7b97<\/th>\n<th>\u539f\u751f\u00a0<code>BigInt<\/code><\/th>\n<th>JSBI<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u4ece Number \u521b\u5efa<\/td>\n<td><code>a = BigInt(789)<\/code><\/td>\n<td><code>a = JSBI.BigInt(789)<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u52a0\u6cd5<\/td>\n<td><code>c = a + b<\/code><\/td>\n<td><code>c = JSBI.add(a, b)<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u51cf\u6cd5<\/td>\n<td><code>c = a - b<\/code><\/td>\n<td><code>c = JSBI.subtract(a, b)<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u2026\u2026\u7136\u540e\uff0c\u5bf9\u4e8e\u90a3\u4e9b\u652f\u6301 bigint \u7684\u6d4f\u89c8\u5668\uff0c\u53ef\u4ee5\u4f7f\u7528 polyfill\uff08Babel \u63d2\u4ef6\uff09\u5c06 JSBI \u8c03\u7528\u8f6c\u6362\u4e3a\u539f\u751f\u7684 bigint\u3002<br \/>\n\u6362\u53e5\u8bdd\u8bf4\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u5efa\u8bae\u6211\u4eec\u5728\u5199\u4ee3\u7801\u65f6\u4f7f\u7528 JSBI \u66ff\u4ee3\u539f\u751f\u7684 bigint\u3002\u4f46\u662f JSBI \u5728\u5185\u90e8\u50cf\u4f7f\u7528 bigint \u4e00\u6837\u4f7f\u7528 number\uff0c\u5e76\u6700\u5927\u7a0b\u5ea6\u6309\u7167\u89c4\u8303\u8fdb\u884c\u6a21\u62df\uff0c\u6240\u4ee5\u4ee3\u7801\u5df2\u7ecf\u662f\u51c6\u5907\u597d\u8f6c\u6362\u6210 bigint \u7684\u4e86\uff08bigint-ready\uff09\u3002<br \/>\n\u5bf9\u4e8e\u4e0d\u652f\u6301 bigint \u7684\u5f15\u64ce\uff0c\u6211\u4eec\u53ef\u4ee5\u201c\u6309\u539f\u6837\u201d\u4f7f\u7528\u6b64\u7c7b JSBI \u4ee3\u7801\uff0c\u5bf9\u4e8e\u90a3\u4e9b\u652f\u6301 bigint \u7684\u5f15\u64ce \u2014\u2014 polyfill \u4f1a\u5c06\u8c03\u7528\u8f6c\u6362\u4e3a\u539f\u751f\u7684 bigint\u3002<\/p>\n<h2>MORE<\/h2>\n<ul>\n<li><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/BigInt\">MDN \u6587\u6863\u5bf9 BigInt \u7684\u4ecb\u7ecd<\/a>\u3002<\/li>\n<li><a href=\"https:\/\/tc39.es\/ecma262\/#sec-bigint-objects\">ECMA262 \u89c4\u8303<\/a>\u3002<\/li>\n<\/ul>\n<h1>Unicode \u5b57\u7b26\u4e32\u5185\u5e55<\/h1>\n<blockquote>\n<p>\u8fdb\u9636\u77e5\u8bc6<br \/>\n\u672c\u8282\u5c06\u66f4\u6df1\u5165\u5730\u4ecb\u7ecd\u5b57\u7b26\u4e32\u7684\u5185\u90e8\u539f\u7406\u3002\u5982\u679c\u4f60\u6253\u7b97\u5904\u7406\u8868\u60c5\u7b26\u53f7\uff08emoji\uff09\u3001\u7f55\u89c1\u7684\u6570\u5b66\u6216\u8c61\u5f62\u6587\u5b57\u5b57\u7b26\uff0c\u6216\u5176\u4ed6\u7f55\u89c1\u5b57\u7b26\uff0c\u8fd9\u4e9b\u77e5\u8bc6\u5c06\u5bf9\u4f60\u5f88\u6709\u7528\u3002<\/p>\n<\/blockquote>\n<p>\u6b63\u5982\u6211\u4eec\u6240\u77e5\uff0cJavaScript \u7684\u5b57\u7b26\u4e32\u662f\u57fa\u4e8e\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Unicode\">Unicode<\/a>\u00a0\u7684\uff1a\u6bcf\u4e2a\u5b57\u7b26\u7531 1-4 \u4e2a\u5b57\u8282\u7684\u5b57\u8282\u5e8f\u5217\u8868\u793a\u3002<br \/>\nJavaScript \u5141\u8bb8\u6211\u4eec\u901a\u8fc7\u4e0b\u8ff0\u4e09\u79cd\u8868\u793a\u65b9\u5f0f\u4e4b\u4e00\u5c06\u4e00\u4e2a\u5b57\u7b26\u4ee5\u5176\u5341\u516d\u8fdb\u5236 Unicode \u7f16\u7801\u7684\u65b9\u5f0f\u63d2\u5165\u5230\u5b57\u7b26\u4e32\u4e2d\uff1a<\/p>\n<ul>\n<li><code>\\xXX<\/code><br \/>\n<code>XX<\/code>\u00a0\u5fc5\u987b\u662f\u4ecb\u4e8e\u00a0<code>00<\/code>\u00a0\u4e0e\u00a0<code>FF<\/code>\u00a0\u4e4b\u95f4\u7684\u4e24\u4f4d\u5341\u516d\u8fdb\u5236\u6570\uff0c<code>\\xXX<\/code>\u00a0\u8868\u793a Unicode \u7f16\u7801\u4e3a\u00a0<code>XX<\/code>\u00a0\u7684\u5b57\u7b26\u3002<br \/>\n\u56e0\u4e3a\u00a0<code>\\xXX<\/code>\u00a0\u7b26\u53f7\u53ea\u652f\u6301\u4e24\u4f4d\u5341\u516d\u8fdb\u5236\u6570\uff0c\u6240\u4ee5\u5b83\u53ea\u80fd\u7528\u4e8e\u524d 256 \u4e2a Unicode \u5b57\u7b26\u3002<br \/>\n\u8fd9\u524d 256 \u4e2a\u5b57\u7b26\u5305\u62ec\u62c9\u4e01\u5b57\u6bcd\u3001\u6700\u57fa\u672c\u7684\u8bed\u6cd5\u5b57\u7b26\u548c\u5176\u4ed6\u4e00\u4e9b\u5b57\u7b26\u3002\u4f8b\u5982\uff0c<code>&quot;\\x7A&quot;<\/code>\u00a0\u8868\u793a\u00a0<code>&quot;z&quot;<\/code>\u00a0(Unicode \u7f16\u7801\u4e3a\u00a0<code>U+007A<\/code>)\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-js\">alert( &quot;\\x7A&quot; ); \/\/ z\nalert( &quot;\\xA9&quot; ); \/\/ \u00a9 (\u7248\u6743\u7b26\u53f7)\n<\/code><\/pre>\n<ul>\n<li><code>\\uXXXX<\/code>\u00a0<code>XXXX<\/code>\u00a0\u5fc5\u987b\u662f 4 \u4f4d\u5341\u516d\u8fdb\u5236\u6570\uff0c\u503c\u4ecb\u4e8e\u00a0<code>0000<\/code>\u00a0\u548c\u00a0<code>FFFF<\/code>\u00a0\u4e4b\u95f4\u3002\u6b64\u65f6\uff0c<code>\\uXXXX<\/code>\u00a0\u4fbf\u8868\u793a Unicode \u7f16\u7801\u4e3a\u00a0<code>XXXX<\/code>\u00a0\u7684\u5b57\u7b26\u3002<br \/>\nUnicode \u503c\u5927\u4e8e\u00a0<code>U+FFFF<\/code>\u00a0\u7684\u5b57\u7b26\u4e5f\u53ef\u4ee5\u7528\u8fd9\u79cd\u65b9\u6cd5\u6765\u8868\u793a\uff0c\u4f46\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8981\u7528\u5230\u4ee3\u7406\u5bf9\uff08\u6211\u4eec\u5c06\u5728\u672c\u7ae0\u7684\u540e\u9762\u8ba8\u8bba\u5b83\uff09\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-js\">alert( &quot;\\u00A9&quot; ); \/\/ \u00a9, \u7b49\u540c\u4e8e \\xA9\uff0c\u53ea\u662f\u4f7f\u7528\u4e86\u56db\u4f4d\u5341\u516d\u8fdb\u5236\u6570\u8868\u793a\u800c\u5df2\nalert( &quot;\\u044F&quot; ); \/\/ \u044f\uff08\u897f\u91cc\u5c14\u5b57\u6bcd\uff09\nalert( &quot;\\u2191&quot; ); \/\/ \u2191\uff08\u4e0a\u7bad\u5934\u7b26\u53f7\uff09\n<\/code><\/pre>\n<ul>\n<li><code>\\u{X\u2026XXXXXX}<\/code><br \/>\n<code>X\u2026XXXXXX<\/code>\u00a0\u5fc5\u987b\u662f\u4ecb\u4e8e\u00a0<code>0<\/code>\u00a0\u548c\u00a0<code>10FFFF<\/code>\uff08Unicode \u5b9a\u4e49\u7684\u6700\u9ad8\u7801\u4f4d\uff09\u4e4b\u95f4\u7684 1 \u5230 6 \u4e2a\u5b57\u8282\u7684\u5341\u516d\u8fdb\u5236\u503c\u3002\u8fd9\u79cd\u8868\u793a\u65b9\u5f0f\u8ba9\u6211\u4eec\u80fd\u591f\u8f7b\u677e\u5730\u8868\u793a\u6240\u6709\u73b0\u6709\u7684 Unicode \u5b57\u7b26\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-js\">alert( &quot;\\u{20331}&quot; ); \/\/ \u4f6b, \u4e00\u4e2a\u4e0d\u5e38\u89c1\u7684\u4e2d\u6587\u5b57\u7b26\uff08\u957f Unicode\uff09\nalert( &quot;\\u{1F60D}&quot; ); \/\/ \ud83d\ude0d, \u4e00\u4e2a\u5fae\u7b11\u7b26\u53f7\uff08\u53e6\u4e00\u4e2a\u957f Unicode\uff09\n<\/code><\/pre>\n<h2>\u4ee3\u7406\u5bf9<\/h2>\n<p>\u6240\u6709\u5e38\u7528\u5b57\u7b26\u90fd\u6709\u5bf9\u5e94\u7684 2 \u5b57\u8282\u957f\u5ea6\u7684\u7f16\u7801\uff084 \u4f4d\u5341\u516d\u8fdb\u5236\u6570\uff09\u3002\u5927\u591a\u6570\u6b27\u6d32\u8bed\u8a00\u7684\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4ee5\u53ca\u57fa\u672c\u7edf\u4e00\u7684 CJK \u8868\u610f\u6587\u5b57\u96c6\uff08CJK \u2014\u2014 \u6765\u81ea\u4e2d\u6587\u3001\u65e5\u6587\u548c\u97e9\u6587\u4e66\u5199\u7cfb\u7edf\uff09\u4e2d\u7684\u5b57\u6bcd\uff0c\u5747\u6709\u5bf9\u5e94\u7684 2 \u5b57\u8282\u957f\u5ea6\u7684 Unicode \u7f16\u7801\u3002<br \/>\n\u6700\u521d\uff0cJavaScript \u662f\u57fa\u4e8e UTF-16 \u7f16\u7801\u7684\uff0c\u53ea\u5141\u8bb8\u6bcf\u4e2a\u5b57\u7b26\u5360 2 \u4e2a\u5b57\u8282\u957f\u5ea6\u3002\u4f46 2 \u4e2a\u5b57\u8282\u53ea\u5141\u8bb8 65536 \u79cd\u7ec4\u5408\uff0c\u8fd9\u5bf9\u4e8e\u8868\u793a Unicode \u91cc\u6bcf\u4e2a\u53ef\u80fd\u7b26\u7684\u53f7\u6765\u8bf4\uff0c\u662f\u4e0d\u591f\u7684\u3002<br \/>\n\u56e0\u6b64\uff0c\u9700\u8981\u4f7f\u7528\u8d85\u8fc7 2 \u4e2a\u5b57\u8282\u957f\u5ea6\u6765\u8868\u793a\u7684\u7a00\u6709\u7b26\u53f7\uff0c\u6211\u4eec\u5219\u4f7f\u7528\u4e00\u5bf9 2 \u5b57\u8282\u957f\u5ea6\u7684\u5b57\u7b26\u7f16\u7801\uff0c\u5b83\u88ab\u79f0\u4e3a\u201c\u4ee3\u7406\u5bf9\u201d\uff08surrogate pair\uff09\u3002<br \/>\n\u8fd9\u79cd\u505a\u4e5f\u6709\u526f\u4f5c\u7528 \u2014\u2014 \u8fd9\u4e9b\u7b26\u53f7\u7684\u957f\u5ea6\u4e3a\u00a0<code>2<\/code>\uff1a<\/p>\n<pre><code class=\"language-js\">alert( '\ud835\udcb3'.length ); \/\/ 2, \u5927\u5199\u7684\u6570\u5b66\u7b26\u53f7 X\nalert( '\ud83d\ude02'.length ); \/\/ 2, \u7b11\u54ed\u7684\u8868\u60c5\nalert( '\ud867\uddf6'.length ); \/\/ 2, \u4e00\u4e2a\u5c11\u89c1\u7684\u4e2d\u6587\u5b57\u7b26\n<\/code><\/pre>\n<p>\u8fd9\u662f\u56e0\u4e3a\u5728 JavaScript \u88ab\u521b\u9020\u51fa\u6765\u7684\u65f6\u5019\uff0c\u4ee3\u7406\u5bf9\u8fd9\u4e2a\u6982\u5ff5\u5e76\u4e0d\u5b58\u5728\uff0c\u56e0\u6b64\u8bed\u8a00\u5e76\u6ca1\u6709\u6b63\u786e\u5904\u7406\u5b83\u4eec\uff01<br \/>\n\u867d\u7136\u4e0a\u9762\u7684\u6bcf\u4e2a\u5b57\u7b26\u4e32\u90fd\u53ea\u6709\u4e00\u4e2a\u5b57\u7b26\uff0c\u4f46\u5176\u00a0<code>length<\/code>\u00a0\u5c5e\u6027\u663e\u793a\u5176\u957f\u5ea6\u4e3a\u00a0<code>2<\/code>\u3002<br \/>\n\u5982\u4f55\u83b7\u53d6\u8fd9\u4e9b\u7b26\u53f7\uff0c\u4e5f\u662f\u4e00\u4e2a\u68d8\u624b\u7684\u95ee\u9898\uff1a\u56e0\u4e3a\u7f16\u7a0b\u8bed\u8a00\u7684\u5927\u90e8\u5206\u529f\u80fd\u90fd\u5c06\u4ee3\u7406\u5bf9\u5f53\u4f5c\u4e24\u4e2a\u5b57\u7b26\u5bf9\u5f85\u3002<br \/>\n\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8f93\u51fa\u4e2d\u770b\u5230\u4e24\u4e2a\u5947\u602a\u7684\u5b57\u7b26\uff1a<\/p>\n<pre><code class=\"language-js\">alert( '\ud835\udcb3'[0] ); \/\/ \u663e\u793a\u51fa\u4e86\u4e00\u4e2a\u5947\u602a\u7684\u7b26\u53f7...\nalert( '\ud835\udcb3'[1] ); \/\/ ...\u4ee3\u7406\u5bf9\u7684\u7247\u6bb5\n<\/code><\/pre>\n<p>\u4ee3\u7406\u5bf9\u7684\u7247\u6bb5\u5931\u53bb\u5f7c\u6b64\u5c31\u6ca1\u6709\u610f\u4e49\u3002\u6240\u4ee5\u4e0a\u9762\u793a\u4f8b\u4e2d\u00a0<code>alert()<\/code>\u00a0\u6253\u5370\u51fa\u7684\u5185\u5bb9\u5176\u5b9e\u5c31\u662f\u6ca1\u6709\u4efb\u4f55\u610f\u4e49\u7684\u5783\u573e\u4fe1\u606f\u3002<br \/>\n\u4ece\u6280\u672f\u4e0a\u8bb2\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee3\u7406\u5bf9\u7684\u7f16\u7801\u6765\u68c0\u6d4b\u4ee3\u7406\u5bf9\uff1a\u5982\u679c\u4e00\u4e2a\u5b57\u7b26\u7684\u7f16\u7801\u5728\u00a0<code>0xd800..0xdbff<\/code>\u00a0\u8fd9\u4e2a\u8303\u56f4\u4e2d\uff0c\u90a3\u4e48\u5b83\u5c31\u662f\u4ee3\u7406\u5bf9\u7684\u524d\u4e00\u4e2a\u90e8\u5206\u3002\u4e0b\u4e00\u4e2a\u5b57\u7b26\uff08\u7b2c\u4e8c\u90e8\u5206\uff09\u7684\u7f16\u7801\u5fc5\u987b\u5728\u00a0<code>0xdc00..0xdfff<\/code>\u00a0\u8303\u56f4\u4e2d\u3002\u8fd9\u4e24\u4e2a\u8303\u56f4\u4e2d\u7684\u7f16\u7801\u662f\u89c4\u8303\u4e2d\u4e13\u4e3a\u4ee3\u7406\u5bf9\u9884\u7559\u7684\u3002<br \/>\n\u57fa\u4e8e\u6b64\uff0cJavaScript \u65b0\u589e\u4e86\u00a0<a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/String\/fromCodePoint\">String.fromCodePoint<\/a>\u00a0\u548c\u00a0<a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/String\/codePointAt\">str.codePointAt<\/a>\u00a0\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u6765\u5904\u7406\u4ee3\u7406\u5bf9\u3002<br \/>\n\u5b83\u4eec\u672c\u8d28\u4e0a\u4e0e\u00a0<a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/String\/fromCharCode\">String.fromCharCode<\/a>\u00a0\u548c\u00a0<a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/String\/charCodeAt\">str.charCodeAt<\/a>\u00a0\u76f8\u540c\uff0c\u4f46\u5b83\u4eec\u53ef\u4ee5\u6b63\u786e\u5730\u5904\u7406\u4ee3\u7406\u5bf9\u3002<br \/>\n\u5728\u8fd9\u91cc\u53ef\u4ee5\u770b\u51fa\u5b83\u4eec\u7684\u533a\u522b\uff1a<\/p>\n<pre><code class=\"language-js\">\/\/ charCodeAt \u4e0d\u4f1a\u8003\u8651\u4ee3\u7406\u5bf9\uff0c\u6240\u4ee5\u8fd4\u56de\u4e86 \ud835\udcb3 \u524d\u534a\u90e8\u5206\u7684\u7f16\u7801:\n\nalert( '\ud835\udcb3'.charCodeAt(0).toString(16) ); \/\/ d835\n\n\/\/ codePointAt \u53ef\u4ee5\u6b63\u786e\u5904\u7406\u4ee3\u7406\u5bf9\nalert( '\ud835\udcb3'.codePointAt(0).toString(16) ); \/\/ 1d4b3\uff0c\u8bfb\u53d6\u5230\u4e86\u5b8c\u6574\u7684\u4ee3\u7406\u5bf9\n<\/code><\/pre>\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u6211\u4eec\u4ece\u00a0<code>\ud835\udcb3<\/code>\u00a0\u7684\u4f4d\u7f6e 1 \u5f00\u59cb\u83b7\u53d6\u5bf9\u5e94\u7684\u7f16\u7801\uff08\u8fd9\u4e48\u505a\u662f\u4e0d\u5bf9\u7684\uff09\uff0c\u90a3\u4e48\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u90fd\u53ea\u4f1a\u8fd4\u56de\u6b64\u4ee3\u7406\u5bf9\u7684\u540e\u534a\u90e8\u5206\uff1a<\/p>\n<pre><code class=\"language-js\">alert( '\ud835\udcb3'.charCodeAt(1).toString(16) ); \/\/ dcb3\nalert( '\ud835\udcb3'.codePointAt(1).toString(16) ); \/\/ dcb3\n\/\/ \u65e0\u610f\u4e49\u7684\u4ee3\u7406\u5bf9\u540e\u534a\u90e8\u5206\n<\/code><\/pre>\n<p>\u4f60\u7a0d\u540e\u53ef\u4ee5\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/iterable\">Iterable object\uff08\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff09<\/a>\u00a0\u4e00\u7ae0\u4e2d\u627e\u5230\u66f4\u591a\u5904\u7406\u4ee3\u7406\u5bf9\u7684\u65b9\u5f0f\u3002\u53ef\u80fd\u4e5f\u6709\u4e13\u95e8\u5904\u7406\u4ee3\u7406\u5bf9\u7684\u5e93\uff0c\u4f46\u6ca1\u6709\u8db3\u591f\u6d41\u884c\u5230\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728\u8fd9\u91cc\u63a8\u8350\u7684\u5e93\u3002<\/p>\n<blockquote>\n<p>\u6ce8\u610f\uff1a\u5728\u4efb\u610f\u70b9\u62c6\u5206\u5b57\u7b26\u4e32\u662f\u5f88\u5371\u9669\u7684<br \/>\n\u6211\u4eec\u4e0d\u80fd\u968f\u610f\u5728\u4efb\u610f\u4f4d\u7f6e\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u62c6\u5206\uff0c\u4f8b\u5982\u901a\u8fc7\u00a0<code>str.slice(0, 4)<\/code>\u00a0\u83b7\u53d6\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5e76\u671f\u5f85\u5b83\u662f\u4e00\u4e2a\u6709\u6548\u7684\u5b57\u7b26\u4e32\uff1a<\/p>\n<\/blockquote>\n<pre><code class=\"language-js\">alert( 'hi \ud83d\ude02'.slice(0, 4) ); \/\/  hi [?]\n<\/code><\/pre>\n<blockquote>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u770b\u5230\u4e00\u4e2a\u6ca1\u6709\u610f\u4e49\u7684\u5783\u573e\u5b57\u7b26\u88ab\u6253\u5370\u4e86\u51fa\u6765\uff08\u7b11\u54ed\u8868\u60c5\u4ee3\u7406\u5bf9\u7684\u524d\u534a\u90e8\u5206\uff09\u3002<br \/>\n\u5982\u679c\u4f60\u671f\u671b\u53ef\u9760\u5730\u4f7f\u7528\u4ee3\u7406\u5bf9\uff0c\u8bf7\u6ce8\u610f\u8fd9\u4e00\u70b9\u3002\u8fd9\u53ef\u80fd\u5e76\u4e0d\u662f\u4ec0\u4e48\u5927\u95ee\u9898\uff0c\u4f46\u81f3\u5c11\u4f60\u5e94\u8be5\u77e5\u9053\u53d1\u751f\u4e86\u4ec0\u4e48\u3002<\/p>\n<\/blockquote>\n<h2>\u53d8\u97f3\u7b26\u53f7\u548c\u89c4\u8303\u5316<\/h2>\n<p>\u5f88\u591a\u8bed\u8a00\u90fd\u6709\u7531\u57fa\u7840\u5b57\u7b26\u53ca\u5176\u4e0a\u65b9\/\u4e0b\u65b9\u7684\u6807\u8bb0\u6240\u7ec4\u6210\u7684\u7b26\u53f7\u3002<br \/>\n\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5b57\u6bcd\u00a0<code>a<\/code>\u00a0\u5c31\u662f\u8fd9\u4e9b\u5b57\u7b26\u00a0<code>\u00e0\u00e1\u00e2\u00e4\u00e3\u00e5\u0101<\/code>\u00a0\u7684\u57fa\u7840\u5b57\u7b26\u3002<br \/>\n\u5927\u591a\u6570\u5e38\u89c1\u7684\u201c\u590d\u5408\u201d\u5b57\u7b26\u5728 Unicode \u8868\u4e2d\u90fd\u6709\u81ea\u5df1\u7684\u7f16\u7801\u3002\u4f46\u4e0d\u662f\u6240\u6709\u8fd9\u4e9b\u5b57\u7b26\u90fd\u6709\u81ea\u5df1\u7684\u7f16\u7801\uff0c\u56e0\u4e3a\u53ef\u80fd\u7684\u7ec4\u5408\u5f62\u5f0f\u592a\u591a\u4e86\u3002<br \/>\n\u4e3a\u4e86\u652f\u6301\u4efb\u610f\u7684\u7ec4\u5408\uff0cUnicode \u6807\u51c6\u5141\u8bb8\u6211\u4eec\u4f7f\u7528\u591a\u4e2a Unicode \u5b57\u7b26\uff1a\u57fa\u7840\u5b57\u7b26\u540e\u8ddf\u7740\u4e00\u4e2a\u6216\u591a\u4e2a\u201c\u88c5\u9970\u201d\u5b83\u7684\u201c\u6807\u8bb0\u201d\u5b57\u7b26\u3002<br \/>\n\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u5728\u00a0<code>S<\/code>\u00a0\u540e\u9644\u52a0\u4e0a\u7279\u6b8a\u7684\u201c\u4e0a\u65b9\u7684\u70b9\u201d\u5b57\u7b26\uff08\u7f16\u7801\u4e3a\u00a0<code>\\u0307<\/code>\uff09\uff0c\u5219\u663e\u793a\u4e3a \u1e60\u3002<\/p>\n<pre><code class=\"language-js\">alert( 'S\\u0307' ); \/\/ S\u0307\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u9700\u8981\u5728\u5b57\u6bcd\u4e0a\u65b9\uff08\u6216\u4e0b\u65b9\uff09\u6dfb\u52a0\u4e00\u4e2a\u989d\u5916\u7684\u6807\u8bb0 \u2014\u2014 \u5f88\u7b80\u5355\uff0c\u53ea\u9700\u6dfb\u52a0\u5fc5\u8981\u7684\u6807\u8bb0\u5b57\u7b26\u5373\u53ef\u3002<br \/>\n\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u7ee7\u7eed\u5728\u540e\u9762\u9644\u52a0\u4e00\u4e2a\u201c\u4e0b\u65b9\u7684\u70b9\u201d\u7b26\u53f7\uff08\u7f16\u7801\u00a0<code>\\u0323<\/code>\uff09\uff0c\u90a3\u4e48\u6211\u4eec\u5c06\u5f97\u5230\u4e00\u4e2a\u201c\u4e0a\u4e0b\u90fd\u6709\u4e00\u4e2a\u70b9\u7b26\u53f7\u7684 S\u201d\uff1a<code>\u1e68<\/code>\u3002<br \/>\n\u5c31\u50cf\u8fd9\u6837\uff1a<\/p>\n<pre><code class=\"language-js\">alert( 'S\\u0307\\u0323' ); \/\/ S\u0307\u0323\n<\/code><\/pre>\n<p>\u8fd9\u63d0\u4f9b\u4e86\u6781\u5927\u7684\u7075\u6d3b\u6027\uff0c\u4f46\u4e5f\u5e26\u6765\u4e86\u4e00\u4e2a\u6709\u8da3\u7684\u95ee\u9898\uff1a\u4e24\u4e2a\u5b57\u7b26\u53ef\u80fd\u5728\u89c6\u89c9\u4e0a\u770b\u8d77\u6765\u76f8\u540c\uff0c\u4f46\u5374\u4f7f\u7528\u7684\u662f\u4e0d\u540c\u7684 Unicode \u7ec4\u5408\u3002<br \/>\n\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"language-js\">let s1 = 'S\\u0307\\u0323'; \/\/ S\u0307\u0323, S + \u4e0a\u65b9\u70b9\u7b26\u53f7 + \u4e0b\u65b9\u70b9\u7b26\u53f7\nlet s2 = 'S\\u0323\\u0307'; \/\/ S\u0323\u0307, S + \u4e0b\u65b9\u70b9\u7b26\u53f7 + \u4e0a\u65b9\u70b9\u7b26\u53f7\n\nalert( `s1: ${s1}, s2: ${s2}` );\n\nalert( s1 == s2 ); \/\/ \u5c3d\u7ba1\u8fd9\u4e24\u4e2a\u5b57\u7b26\u5728\u6211\u4eec\u770b\u6765\u662f\u76f8\u901a\u7684\uff0c\u4f46\u7ed3\u679c\u5374\u662f false\n<\/code><\/pre>\n<p>\u201cUnicode \u89c4\u8303\u5316\u201d\u7b97\u6cd5\u53ef\u4ee5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u8be5\u7b97\u6cd5\u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5355\u4e00\u7684\u201c\u89c4\u8303\u7684\u201d\u5f62\u5f0f\u3002<br \/>\n\u53ef\u4ee5\u501f\u52a9\u00a0<a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/String\/normalize\">str.normalize()<\/a>\u00a0\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n<pre><code class=\"language-js\">alert( &quot;S\\u0307\\u0323&quot;.normalize() == &quot;S\\u0323\\u0307&quot;.normalize() ); \/\/ true\n<\/code><\/pre>\n<p>\u6709\u610f\u601d\u7684\u662f\uff0c\u5728\u6211\u4eec\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>normalize()<\/code>\u00a0\u5c06 3 \u4e2a\u5b57\u7b26\u7684\u5e8f\u5217\u5408\u5e76\u4e3a\u4e86\u4e00\u4e2a\u5b57\u7b26\uff1a<code>\\u1e68<\/code>\uff08\u5e26\u6709\u4e0a\u4e0b\u4e24\u4e2a\u70b9\u7684 S\uff09\u3002<\/p>\n<pre><code class=\"language-js\">alert( &quot;S\\u0307\\u0323&quot;.normalize().length ); \/\/ 1\n\nalert( &quot;S\\u0307\\u0323&quot;.normalize() == &quot;\\u1e68&quot; ); \/\/ true\n<\/code><\/pre>\n<p>\u4f46\u5b9e\u9645\u5e76\u975e\u603b\u662f\u5982\u6b64\u3002\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\u7684\u539f\u56e0\u662f\u7b26\u53f7\u00a0<code>\u1e68<\/code>\u00a0\u662f\u201c\u8db3\u591f\u5e38\u89c1\u7684\u201d\uff0c\u6240\u4ee5 Unicode \u521b\u5efa\u8005\u5c06\u5176\u56ca\u62ec\u5728\u4e86 Unicode \u4e3b\u8868\u4e2d\uff0c\u5e76\u4e3a\u5176\u63d0\u4f9b\u4e86\u5bf9\u5e94\u7684\u7f16\u7801\u3002<br \/>\n\u5982\u679c\u4f60\u60f3\u4e86\u89e3\u5173\u4e8e Unicode \u89c4\u8303\u5316\u89c4\u5219\u548c\u53d8\u4f53\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u53ef\u4ee5\u53c2\u9605 Unicode \u6807\u51c6\u7684\u9644\u5f55\u4e2d\u7684\u5185\u5bb9\uff1a<a href=\"https:\/\/www.unicode.org\/reports\/tr15\/\">Unicode \u89c4\u8303\u5316\u5f62\u5f0f<\/a>\u3002\u4f46\u5c31\u5b9e\u7528\u800c\u8a00\uff0c\u672c\u8282\u4e2d\u7684\u4fe1\u606f\u5c31\u5df2\u7ecf\u8db3\u591f\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Proxy \u548c Reflect \u4e00\u4e2a\u00a0Proxy\u00a0\u5bf9\u8c61\u5305\u88c5\u53e6\u4e00\u4e2a\u5bf9\u8c61\u5e76\u62e6\u622a\u8bf8\u5982\u8bfb\u53d6\/\u5199\u5165\u5c5e\u6027\u548c\u5176\u4ed6\u64cd\u4f5c\uff0c\u53ef\u4ee5\u9009 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-678","post","type-post","status-publish","format-standard","hentry","category-front-end"],"_links":{"self":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/678","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=678"}],"version-history":[{"count":1,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/678\/revisions"}],"predecessor-version":[{"id":679,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/678\/revisions\/679"}],"wp:attachment":[{"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=678"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=678"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=678"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}