{"id":698,"date":"2024-06-28T00:23:23","date_gmt":"2024-06-27T16:23:23","guid":{"rendered":"https:\/\/levin.ink\/?p=698"},"modified":"2024-06-28T00:23:23","modified_gmt":"2024-06-27T16:23:23","slug":"js-3-17-%e4%ba%8c%e8%bf%9b%e5%88%b6%e6%95%b0%e6%8d%ae%ef%bc%8c%e6%96%87%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/levin.ink\/?p=698","title":{"rendered":"JS &#8211; 3-17 \u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u6587\u4ef6"},"content":{"rendered":"<h1>ArrayBuffer \u4e8c\u8fdb\u5236\u6587\u4ef6<\/h1>\n<p>\u5728 Web \u5f00\u53d1\u4e2d\uff0c\u5f53\u6211\u4eec\u5904\u7406\u6587\u4ef6\u65f6\uff08\u521b\u5efa\uff0c\u4e0a\u4f20\uff0c\u4e0b\u8f7d\uff09\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u4e8c\u8fdb\u5236\u6570\u636e\u3002\u53e6\u4e00\u4e2a\u5178\u578b\u7684\u5e94\u7528\u573a\u666f\u662f\u56fe\u50cf\u5904\u7406\u3002<br \/>\n\u8fd9\u4e9b\u90fd\u53ef\u4ee5\u901a\u8fc7 JavaScript \u8fdb\u884c\u5904\u7406\uff0c\u800c\u4e14\u4e8c\u8fdb\u5236\u64cd\u4f5c\u6027\u80fd\u66f4\u9ad8\u3002<br \/>\n\u4e0d\u8fc7\uff0c\u5728 JavaScript \u4e2d\u6709\u5f88\u591a\u79cd\u4e8c\u8fdb\u5236\u6570\u636e\u683c\u5f0f\uff0c\u4f1a\u6709\u70b9\u5bb9\u6613\u6df7\u6dc6\u3002\u4ec5\u4e3e\u51e0\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<ul>\n<li><code>ArrayBuffer<\/code>\uff0c<code>Uint8Array<\/code>\uff0c<code>DataView<\/code>\uff0c<code>Blob<\/code>\uff0c<code>File<\/code>\u00a0\u53ca\u5176\u4ed6\u3002<br \/>\n\u4e0e\u5176\u4ed6\u8bed\u8a00\u76f8\u6bd4\uff0cJavaScript \u4e2d\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u662f\u4ee5\u975e\u6807\u51c6\u65b9\u5f0f\u5b9e\u73b0\u7684\u3002\u4f46\u662f\uff0c\u5f53\u6211\u4eec\u7406\u6e05\u695a\u4ee5\u540e\uff0c\u4e00\u5207\u5c31\u4f1a\u53d8\u5f97\u76f8\u5f53\u7b80\u5355\u4e86\u3002<br \/>\n<strong>\u57fa\u672c\u7684\u4e8c\u8fdb\u5236\u5bf9\u8c61\u662f\u00a0<code>ArrayBuffer<\/code>\u00a0\u2014\u2014 \u5bf9\u56fa\u5b9a\u957f\u5ea6\u7684\u8fde\u7eed\u5185\u5b58\u7a7a\u95f4\u7684\u5f15\u7528\u3002<\/strong><br \/>\n\u6211\u4eec\u8fd9\u6837\u521b\u5efa\u5b83\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let buffer = new ArrayBuffer(16); \/\/ \u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a 16 \u7684 buffer\nalert(buffer.byteLength); \/\/ 16\n<\/code><\/pre>\n<p>\u5b83\u4f1a\u5206\u914d\u4e00\u4e2a 16 \u5b57\u8282\u7684\u8fde\u7eed\u5185\u5b58\u7a7a\u95f4\uff0c\u5e76\u7528 0 \u8fdb\u884c\u9884\u586b\u5145\u3002<\/p>\n<blockquote>\n<p><code>ArrayBuffer<\/code>\u00a0\u4e0d\u662f\u67d0\u79cd\u4e1c\u897f\u7684\u6570\u7ec4<br \/>\n\u8ba9\u6211\u4eec\u5148\u6f84\u6e05\u4e00\u4e2a\u53ef\u80fd\u7684\u8bef\u533a\u3002<code>ArrayBuffer<\/code>\u00a0\u4e0e\u00a0<code>Array<\/code>\u00a0\u6ca1\u6709\u4efb\u4f55\u5171\u540c\u4e4b\u5904\uff1a<\/p>\n<ul>\n<li>\u5b83\u7684\u957f\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u6211\u4eec\u65e0\u6cd5\u589e\u52a0\u6216\u51cf\u5c11\u5b83\u7684\u957f\u5ea6\u3002<\/li>\n<li>\u5b83\u6b63\u597d\u5360\u7528\u4e86\u5185\u5b58\u4e2d\u7684\u90a3\u4e48\u591a\u7a7a\u95f4\u3002<\/li>\n<li>\u8981\u8bbf\u95ee\u5355\u4e2a\u5b57\u8282\uff0c\u9700\u8981\u53e6\u4e00\u4e2a\u201c\u89c6\u56fe\u201d\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u00a0<code>buffer[index]<\/code>\u3002<\/li>\n<\/ul>\n<\/blockquote>\n<p><code>ArrayBuffer<\/code>\u00a0\u662f\u4e00\u4e2a\u5185\u5b58\u533a\u57df\u3002\u5b83\u91cc\u9762\u5b58\u50a8\u4e86\u4ec0\u4e48\uff1f\u65e0\u4ece\u5224\u65ad\u3002\u53ea\u662f\u4e00\u4e2a\u539f\u59cb\u7684\u5b57\u8282\u5e8f\u5217\u3002<br \/>\n<strong>\u5982\u8981\u64cd\u4f5c\u00a0<code>ArrayBuffer<\/code>\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528\u201c\u89c6\u56fe\u201d\u5bf9\u8c61\u3002<\/strong><br \/>\n\u89c6\u56fe\u5bf9\u8c61\u672c\u8eab\u5e76\u4e0d\u5b58\u50a8\u4efb\u4f55\u4e1c\u897f\u3002\u5b83\u662f\u4e00\u526f\u201c\u773c\u955c\u201d\uff0c\u900f\u8fc7\u5b83\u6765\u89e3\u91ca\u5b58\u50a8\u5728\u00a0<code>ArrayBuffer<\/code>\u00a0\u4e2d\u7684\u5b57\u8282\u3002<br \/>\n\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong><code>Uint8Array<\/code><\/strong>\u00a0\u2014\u2014 \u5c06\u00a0<code>ArrayBuffer<\/code>\u00a0\u4e2d\u7684\u6bcf\u4e2a\u5b57\u8282\u89c6\u4e3a 0 \u5230 255 \u4e4b\u95f4\u7684\u5355\u4e2a\u6570\u5b57\uff08\u6bcf\u4e2a\u5b57\u8282\u662f 8 \u4f4d\uff0c\u56e0\u6b64\u53ea\u80fd\u5bb9\u7eb3\u90a3\u4e48\u591a\uff09\u3002\u8fd9\u79f0\u4e3a \u201c8 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u201d\u3002<\/li>\n<li><strong><code>Uint16Array<\/code><\/strong>\u00a0\u2014\u2014 \u5c06\u6bcf 2 \u4e2a\u5b57\u8282\u89c6\u4e3a\u4e00\u4e2a 0 \u5230 65535 \u4e4b\u95f4\u7684\u6574\u6570\u3002\u8fd9\u79f0\u4e3a \u201c16 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u201d\u3002<\/li>\n<li><strong><code>Uint32Array<\/code><\/strong>\u00a0\u2014\u2014 \u5c06\u6bcf 4 \u4e2a\u5b57\u8282\u89c6\u4e3a\u4e00\u4e2a 0 \u5230 4294967295 \u4e4b\u95f4\u7684\u6574\u6570\u3002\u8fd9\u79f0\u4e3a \u201c32 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u201d\u3002<\/li>\n<li><strong><code>Float64Array<\/code><\/strong>\u00a0\u2014\u2014 \u5c06\u6bcf 8 \u4e2a\u5b57\u8282\u89c6\u4e3a\u4e00\u4e2a\u00a0<code>5.0x10-324<\/code>\u00a0\u5230\u00a0<code>1.8x10308<\/code>\u00a0\u4e4b\u95f4\u7684\u6d6e\u70b9\u6570\u3002<br \/>\n\u56e0\u6b64\uff0c\u4e00\u4e2a 16 \u5b57\u8282\u00a0<code>ArrayBuffer<\/code>\u00a0\u4e2d\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u53ef\u4ee5\u89e3\u91ca\u4e3a 16 \u4e2a\u201c\u5c0f\u6570\u5b57\u201d\uff0c\u6216 8 \u4e2a\u66f4\u5927\u7684\u6570\u5b57\uff08\u6bcf\u4e2a\u6570\u5b57 2 \u4e2a\u5b57\u8282\uff09\uff0c\u6216 4 \u4e2a\u66f4\u5927\u7684\u6570\u5b57\uff08\u6bcf\u4e2a\u6570\u5b57 4 \u4e2a\u5b57\u8282\uff09\uff0c\u6216 2 \u4e2a\u9ad8\u7cbe\u5ea6\u7684\u6d6e\u70b9\u6570\uff08\u6bcf\u4e2a\u6570\u5b57 8 \u4e2a\u5b57\u8282\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-20240627233631.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-20240627233631.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20240627233631.png\"><\/div><br \/>\n<code>ArrayBuffer<\/code>\u00a0\u662f\u6838\u5fc3\u5bf9\u8c61\uff0c\u662f\u6240\u6709\u7684\u57fa\u7840\uff0c\u662f\u539f\u59cb\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u3002<br \/>\n\u4f46\u662f\uff0c\u5982\u679c\u6211\u4eec\u8981\u5199\u5165\u503c\u6216\u904d\u5386\u5b83\uff0c\u57fa\u672c\u4e0a\u51e0\u4e4e\u6240\u6709\u64cd\u4f5c \u2014\u2014 \u6211\u4eec\u5fc5\u987b\u4f7f\u7528\u89c6\u56fe\uff08view\uff09\uff0c\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let buffer = new ArrayBuffer(16); \/\/ \u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a 16 \u7684 buffer\n\nlet view = new Uint32Array(buffer); \/\/ \u5c06 buffer \u89c6\u4e3a\u4e00\u4e2a 32 \u4f4d\u6574\u6570\u7684\u5e8f\u5217\n\nalert(Uint32Array.BYTES_PER_ELEMENT); \/\/ \u6bcf\u4e2a\u6574\u6570 4 \u4e2a\u5b57\u8282\n\nalert(view.length); \/\/ 4\uff0c\u5b83\u5b58\u50a8\u4e86 4 \u4e2a\u6574\u6570\nalert(view.byteLength); \/\/ 16\uff0c\u5b57\u8282\u4e2d\u7684\u5927\u5c0f\n\n\/\/ \u8ba9\u6211\u4eec\u5199\u5165\u4e00\u4e2a\u503c\nview[0] = 123456;\n\n\/\/ \u904d\u5386\u503c\nfor(let num of view) {\n  alert(num); \/\/ 123456\uff0c\u7136\u540e 0\uff0c0\uff0c0\uff08\u4e00\u5171 4 \u4e2a\u503c\uff09\n}\n<\/code><\/pre>\n<h2>TypedArray<\/h2>\n<p>\u6240\u6709\u8fd9\u4e9b\u89c6\u56fe\uff08<code>Uint8Array<\/code>\uff0c<code>Uint32Array<\/code>\u00a0\u7b49\uff09\u7684\u901a\u7528\u672f\u8bed\u662f\u00a0<a href=\"https:\/\/tc39.github.io\/ecma262\/#sec-typedarray-objects\">TypedArray<\/a>\u3002\u5b83\u4eec\u5171\u4eab\u540c\u4e00\u65b9\u6cd5\u548c\u5c5e\u6027\u96c6\u3002<br \/>\n\u8bf7\u6ce8\u610f\uff0c\u6ca1\u6709\u540d\u4e3a\u00a0<code>TypedArray<\/code>\u00a0\u7684\u6784\u9020\u5668\uff0c\u5b83\u53ea\u662f\u8868\u793a\u00a0<code>ArrayBuffer<\/code>\u00a0\u4e0a\u7684\u89c6\u56fe\u4e4b\u4e00\u7684\u901a\u7528\u603b\u79f0\u672f\u8bed\uff1a<code>Int8Array<\/code>\uff0c<code>Uint8Array<\/code>\u00a0\u53ca\u5176\u4ed6\uff0c\u5f88\u5feb\u5c31\u4f1a\u6709\u5b8c\u6574\u5217\u8868\u3002<br \/>\n\u5f53\u4f60\u770b\u5230\u00a0<code>new TypedArray<\/code>\u00a0\u4e4b\u7c7b\u7684\u5185\u5bb9\u65f6\uff0c\u5b83\u8868\u793a\u00a0<code>new Int8Array<\/code>\u3001<code>new Uint8Array<\/code>\u00a0\u53ca\u5176\u4ed6\u4e2d\u4e4b\u4e00\u3002<br \/>\n\u7c7b\u578b\u5316\u6570\u7ec4\u7684\u884c\u4e3a\u7c7b\u4f3c\u4e8e\u5e38\u89c4\u6570\u7ec4\uff1a\u5177\u6709\u7d22\u5f15\uff0c\u5e76\u4e14\u662f\u53ef\u8fed\u4ee3\u7684\u3002<br \/>\n\u4e00\u4e2a\u7c7b\u578b\u5316\u6570\u7ec4\u7684\u6784\u9020\u5668\uff08\u65e0\u8bba\u662f\u00a0<code>Int8Array<\/code>\u00a0\u6216\u00a0<code>Float64Array<\/code>\uff0c\u90fd\u65e0\u5173\u7d27\u8981\uff09\uff0c\u5176\u884c\u4e3a\u5404\u4e0d\u76f8\u540c\uff0c\u5e76\u4e14\u53d6\u51b3\u4e8e\u53c2\u6570\u7c7b\u578b\u3002<br \/>\n\u53c2\u6570\u6709 5 \u79cd\u53d8\u4f53\uff1a<\/p>\n<pre><code class=\"language-js\">new TypedArray(buffer, [byteOffset], [length]);\nnew TypedArray(object);\nnew TypedArray(typedArray);\nnew TypedArray(length);\nnew TypedArray();\n<\/code><\/pre>\n<ol>\n<li>\u5982\u679c\u7ed9\u5b9a\u7684\u662f\u00a0<code>ArrayBuffer<\/code>\u00a0\u53c2\u6570\uff0c\u5219\u4f1a\u5728\u5176\u4e0a\u521b\u5efa\u89c6\u56fe\u3002\u6211\u4eec\u5df2\u7ecf\u7528\u8fc7\u8be5\u8bed\u6cd5\u4e86\u3002<br \/>\n\u53ef\u9009\uff0c\u6211\u4eec\u53ef\u4ee5\u7ed9\u5b9a\u8d77\u59cb\u4f4d\u7f6e\u00a0<code>byteOffset<\/code>\uff08\u9ed8\u8ba4\u4e3a 0\uff09\u4ee5\u53ca\u00a0<code>length<\/code>\uff08\u9ed8\u8ba4\u81f3 buffer \u7684\u672b\u5c3e\uff09\uff0c\u8fd9\u6837\u89c6\u56fe\u5c06\u4ec5\u6db5\u76d6\u00a0<code>buffer<\/code>\u00a0\u7684\u4e00\u90e8\u5206\u3002<\/li>\n<li>\u5982\u679c\u7ed9\u5b9a\u7684\u662f\u00a0<code>Array<\/code>\uff0c\u6216\u4efb\u4f55\u7c7b\u6570\u7ec4\u5bf9\u8c61\uff0c\u5219\u4f1a\u521b\u5efa\u4e00\u4e2a\u76f8\u540c\u957f\u5ea6\u7684\u7c7b\u578b\u5316\u6570\u7ec4\uff0c\u5e76\u590d\u5236\u5176\u5185\u5bb9\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b83\u6765\u9884\u586b\u5145\u6570\u7ec4\u7684\u6570\u636e\uff1a<\/li>\n<\/ol>\n<pre><code class=\"language-js\">let arr = new Uint8Array([0, 1, 2, 3]);\nalert( arr.length ); \/\/ 4\uff0c\u521b\u5efa\u4e86\u76f8\u540c\u957f\u5ea6\u7684\u4e8c\u8fdb\u5236\u6570\u7ec4\nalert( arr[1] ); \/\/ 1\uff0c\u7528\u7ed9\u5b9a\u503c\u586b\u5145\u4e86 4 \u4e2a\u5b57\u8282\uff08\u65e0\u7b26\u53f7 8 \u4f4d\u6574\u6570\uff09\n<\/code><\/pre>\n<ol start=\"3\">\n<li>\u5982\u679c\u7ed9\u5b9a\u7684\u662f\u53e6\u4e00\u4e2a\u00a0<code>TypedArray<\/code>\uff0c\u4e5f\u662f\u5982\u6b64\uff1a\u521b\u5efa\u4e00\u4e2a\u76f8\u540c\u957f\u5ea6\u7684\u7c7b\u578b\u5316\u6570\u7ec4\uff0c\u5e76\u590d\u5236\u5176\u5185\u5bb9\u3002\u5982\u679c\u9700\u8981\u7684\u8bdd\uff0c\u6570\u636e\u5728\u6b64\u8fc7\u7a0b\u4e2d\u4f1a\u88ab\u8f6c\u6362\u4e3a\u65b0\u7684\u7c7b\u578b\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">let arr16 = new Uint16Array([1, 1000]);\nlet arr8 = new Uint8Array(arr16);\nalert( arr8[0] ); \/\/ 1\nalert( arr8[1] ); \/\/ 232\uff0c\u8bd5\u56fe\u590d\u5236 1000\uff0c\u4f46\u65e0\u6cd5\u5c06 1000 \u653e\u8fdb 8 \u4f4d\u5b57\u8282\u4e2d\uff08\u8be6\u8ff0\u89c1\u4e0b\u6587\uff09\u3002\n<\/code><\/pre>\n<ol start=\"4\">\n<li>\u5bf9\u4e8e\u6570\u5b57\u53c2\u6570\u00a0<code>length<\/code>\u00a0\u2014\u2014 \u521b\u5efa\u7c7b\u578b\u5316\u6570\u7ec4\u4ee5\u5305\u542b\u8fd9\u4e48\u591a\u5143\u7d20\u3002\u5b83\u7684\u5b57\u8282\u957f\u5ea6\u5c06\u662f\u00a0<code>length<\/code>\u00a0\u4e58\u4ee5\u5355\u4e2a\u00a0<code>TypedArray.BYTES_PER_ELEMENT<\/code>\u00a0\u4e2d\u7684\u5b57\u8282\u6570\uff1a<\/li>\n<li>\u4e0d\u5e26\u53c2\u6570\u7684\u60c5\u51b5\u4e0b\uff0c\u521b\u5efa\u957f\u5ea6\u4e3a\u96f6\u7684\u7c7b\u578b\u5316\u6570\u7ec4\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u521b\u5efa\u4e00\u4e2a\u00a0<code>TypedArray<\/code>\uff0c\u800c\u65e0\u9700\u63d0\u53ca\u00a0<code>ArrayBuffer<\/code>\u3002\u4f46\u662f\uff0c\u89c6\u56fe\u79bb\u4e0d\u5f00\u5e95\u5c42\u7684\u00a0<code>ArrayBuffer<\/code>\uff0c\u56e0\u6b64\uff0c\u9664\u7b2c\u4e00\u79cd\u60c5\u51b5\uff08\u5df2\u63d0\u4f9b\u00a0<code>ArrayBuffer<\/code>\uff09\u5916\uff0c\u5176\u4ed6\u6240\u6709\u60c5\u51b5\u90fd\u4f1a\u81ea\u52a8\u521b\u5efa\u00a0<code>ArrayBuffer<\/code>\u3002<br \/>\n\u5982\u8981\u8bbf\u95ee\u5e95\u5c42\u7684\u00a0<code>ArrayBuffer<\/code>\uff0c\u90a3\u4e48\u5728\u00a0<code>TypedArray<\/code>\u00a0\u4e2d\u6709\u5982\u4e0b\u7684\u5c5e\u6027\uff1a<\/li>\n<\/ol>\n<ul>\n<li><code>arr.buffer<\/code>\u00a0\u2014\u2014 \u5f15\u7528\u00a0<code>ArrayBuffer<\/code>\u3002<\/li>\n<li><code>arr.byteLength<\/code>\u00a0\u2014\u2014\u00a0<code>ArrayBuffer<\/code>\u00a0\u7684\u957f\u5ea6\u3002<br \/>\n\u56e0\u6b64\uff0c\u6211\u4eec\u603b\u662f\u53ef\u4ee5\u4ece\u4e00\u4e2a\u89c6\u56fe\u8f6c\u5230\u53e6\u4e00\u4e2a\u89c6\u56fe\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let arr8 = new Uint8Array([0, 1, 2, 3]);\n\n\/\/ \u540c\u4e00\u6570\u636e\u7684\u53e6\u4e00\u4e2a\u89c6\u56fe\nlet arr16 = new Uint16Array(arr8.buffer);\n<\/code><\/pre>\n<p>\u4e0b\u9762\u662f\u7c7b\u578b\u5316\u6570\u7ec4\u7684\u5217\u8868\uff1a<\/p>\n<ul>\n<li><code>Uint8Array<\/code>\uff0c<code>Uint16Array<\/code>\uff0c<code>Uint32Array<\/code>\u00a0\u2014\u2014 \u7528\u4e8e 8\u300116 \u548c 32 \u4f4d\u7684\u6574\u6570\u3002\n<ul>\n<li><code>Uint8ClampedArray<\/code>\u00a0\u2014\u2014 \u7528\u4e8e 8 \u4f4d\u6574\u6570\uff0c\u5728\u8d4b\u503c\u65f6\u4fbf\u201c\u56fa\u5b9a\u201c\u5176\u503c\uff08\u89c1\u4e0b\u6587\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<li><code>Int8Array<\/code>\uff0c<code>Int16Array<\/code>\uff0c<code>Int32Array<\/code>\u00a0\u2014\u2014 \u7528\u4e8e\u6709\u7b26\u53f7\u6574\u6570\uff08\u53ef\u4ee5\u4e3a\u8d1f\u6570\uff09\u3002<\/li>\n<li><code>Float32Array<\/code>\uff0c<code>Float64Array<\/code>\u00a0\u2014\u2014 \u7528\u4e8e 32 \u4f4d\u548c 64 \u4f4d\u7684\u6709\u7b26\u53f7\u6d6e\u70b9\u6570\u3002<\/li>\n<\/ul>\n<blockquote>\n<p>\u6ca1\u6709\u00a0<code>int8<\/code>\u00a0\u6216\u7c7b\u4f3c\u7684\u5355\u503c\u7c7b\u578b<br \/>\n\u8bf7\u6ce8\u610f\uff0c\u5c3d\u7ba1\u6709\u7c7b\u4f3c\u00a0<code>Int8Array<\/code>\u00a0\u8fd9\u6837\u7684\u540d\u79f0\uff0c\u4f46 JavaScript \u4e2d\u5e76\u6ca1\u6709\u50cf\u00a0<code>int<\/code>\uff0c\u6216\u00a0<code>int8<\/code>\u00a0\u8fd9\u6837\u7684\u5355\u503c\u7c7b\u578b\u3002<br \/>\n\u8fd9\u662f\u5408\u4e4e\u903b\u8f91\u7684\uff0c\u56e0\u4e3a\u00a0<code>Int8Array<\/code>\u00a0\u4e0d\u662f\u8fd9\u4e9b\u5355\u503c\u7684\u6570\u7ec4\uff0c\u800c\u662f\u00a0<code>ArrayBuffer<\/code>\u00a0\u4e0a\u7684\u89c6\u56fe\u3002<\/p>\n<\/blockquote>\n<h3>\u8d8a\u754c\u884c\u4e3a<\/h3>\n<p>\u5982\u679c\u6211\u4eec\u5c1d\u8bd5\u5c06\u8d8a\u754c\u503c\u5199\u5165\u7c7b\u578b\u5316\u6570\u7ec4\u4f1a\u51fa\u73b0\u4ec0\u4e48\u60c5\u51b5\uff1f\u4e0d\u4f1a\u62a5\u9519\u3002\u4f46\u662f\u591a\u4f59\u7684\u4f4d\u88ab\u5207\u9664\u3002<br \/>\n\u4f8b\u5982\uff0c\u6211\u4eec\u5c1d\u8bd5\u5c06 256 \u653e\u5165\u00a0<code>Uint8Array<\/code>\u3002256 \u7684\u4e8c\u8fdb\u5236\u683c\u5f0f\u662f\u00a0<code>100000000<\/code>\uff089 \u4f4d\uff09\uff0c\u4f46\u00a0<code>Uint8Array<\/code>\u00a0\u6bcf\u4e2a\u503c\u53ea\u6709 8 \u4f4d\uff0c\u56e0\u6b64\u53ef\u7528\u8303\u56f4\u4e3a 0 \u5230 255\u3002<br \/>\n\u5bf9\u4e8e\u66f4\u5927\u7684\u6570\u5b57\uff0c\u4ec5\u5b58\u50a8\u6700\u53f3\u8fb9\u7684\uff08\u4f4e\u4f4d\u6709\u6548\uff098 \u4f4d\uff0c\u5176\u4f59\u90e8\u5206\u88ab\u5207\u9664\uff1a<br \/>\n\u56e0\u6b64\u7ed3\u679c\u662f 0\u3002<br \/>\n257 \u7684\u4e8c\u8fdb\u5236\u683c\u5f0f\u662f\u00a0<code>100000001<\/code>\uff089 \u4f4d\uff09\uff0c\u6700\u53f3\u8fb9\u7684 8 \u4f4d\u4f1a\u88ab\u5b58\u50a8\uff0c\u56e0\u6b64\u6570\u7ec4\u4e2d\u4f1a\u6709\u00a0<code>1<\/code>\uff1a<br \/>\n\u6362\u53e5\u8bdd\u8bf4\uff0c\u8be5\u6570\u5b57\u5bf9 2^8\u00a0\u53d6\u6a21\u7684\u7ed3\u679c\u88ab\u4fdd\u5b58\u4e86\u4e0b\u6765\u3002<br \/>\n<code>Uint8ClampedArray<\/code>\u00a0\u5728\u8fd9\u65b9\u9762\u6bd4\u8f83\u7279\u6b8a\uff0c\u5b83\u7684\u8868\u73b0\u4e0d\u592a\u4e00\u6837\u3002\u5bf9\u4e8e\u5927\u4e8e 255 \u7684\u4efb\u4f55\u6570\u5b57\uff0c\u5b83\u5c06\u4fdd\u5b58\u4e3a 255\uff0c\u5bf9\u4e8e\u4efb\u4f55\u8d1f\u6570\uff0c\u5b83\u5c06\u4fdd\u5b58\u4e3a 0\u3002\u6b64\u884c\u4e3a\u5bf9\u4e8e\u56fe\u50cf\u5904\u7406\u5f88\u6709\u7528\u3002<\/p>\n<h2>TypedArray \u65b9\u6cd5<\/h2>\n<p><code>TypedArray<\/code>\u00a0\u5177\u6709\u5e38\u89c4\u7684\u00a0<code>Array<\/code>\u00a0\u65b9\u6cd5\uff0c\u4f46\u6709\u4e2a\u660e\u663e\u7684\u4f8b\u5916\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u904d\u5386\uff08iterate\uff09\uff0c<code>map<\/code>\uff0c<code>slice<\/code>\uff0c<code>find<\/code>\u00a0\u548c\u00a0<code>reduce<\/code>\u00a0\u7b49\u3002<br \/>\n\u4f46\u6709\u51e0\u4ef6\u4e8b\u6211\u4eec\u505a\u4e0d\u4e86\uff1a<\/p>\n<ul>\n<li>\u6ca1\u6709\u00a0<code>splice<\/code>\u00a0\u2014\u2014 \u6211\u4eec\u65e0\u6cd5\u201c\u5220\u9664\u201d\u4e00\u4e2a\u503c\uff0c\u56e0\u4e3a\u7c7b\u578b\u5316\u6570\u7ec4\u662f\u7f13\u51b2\u533a\uff08buffer\uff09\u4e0a\u7684\u89c6\u56fe\uff0c\u5e76\u4e14\u7f13\u51b2\u533a\uff08buffer\uff09\u662f\u56fa\u5b9a\u7684\u3001\u8fde\u7eed\u7684\u5185\u5b58\u533a\u57df\u3002\u6211\u4eec\u6240\u80fd\u505a\u7684\u5c31\u662f\u5206\u914d\u4e00\u4e2a\u96f6\u503c\u3002<\/li>\n<li>\u65e0\u00a0<code>concat<\/code>\u00a0\u65b9\u6cd5\u3002<br \/>\n\u8fd8\u6709\u4e24\u79cd\u5176\u4ed6\u65b9\u6cd5\uff1a<\/li>\n<li><code>arr.set(fromArr, [offset])<\/code>\u00a0\u4ece\u00a0<code>offset<\/code>\uff08\u9ed8\u8ba4\u4e3a 0\uff09\u5f00\u59cb\uff0c\u5c06\u00a0<code>fromArr<\/code>\u00a0\u4e2d\u7684\u6240\u6709\u5143\u7d20\u590d\u5236\u5230\u00a0<code>arr<\/code>\u3002<\/li>\n<li><code>arr.subarray([begin, end])<\/code>\u00a0\u521b\u5efa\u4e00\u4e2a\u4ece\u00a0<code>begin<\/code>\u00a0\u5230\u00a0<code>end<\/code>\uff08\u4e0d\u5305\u62ec\uff09\u76f8\u540c\u7c7b\u578b\u7684\u65b0\u89c6\u56fe\u3002\u8fd9\u7c7b\u4f3c\u4e8e\u00a0<code>slice<\/code>\u00a0\u65b9\u6cd5\uff08\u540c\u6837\u4e5f\u652f\u6301\uff09\uff0c\u4f46\u4e0d\u590d\u5236\u4efb\u4f55\u5185\u5bb9 \u2014\u2014 \u53ea\u662f\u521b\u5efa\u4e00\u4e2a\u65b0\u89c6\u56fe\uff0c\u4ee5\u5bf9\u7ed9\u5b9a\u7247\u6bb5\u7684\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\u3002<br \/>\n\u6709\u4e86\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u590d\u5236\u3001\u6df7\u5408\u7c7b\u578b\u5316\u6570\u7ec4\uff0c\u4ece\u73b0\u6709\u6570\u7ec4\u521b\u5efa\u65b0\u6570\u7ec4\u7b49\u3002<\/li>\n<\/ul>\n<h2>DataView<\/h2>\n<p><a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/DataView\">DataView<\/a>\u00a0\u662f\u5728\u00a0<code>ArrayBuffer<\/code>\u00a0\u4e0a\u7684\u4e00\u79cd\u7279\u6b8a\u7684\u8d85\u7075\u6d3b\u201c\u672a\u7c7b\u578b\u5316\u201d\u89c6\u56fe\u3002\u5b83\u5141\u8bb8\u4ee5\u4efb\u4f55\u683c\u5f0f\u8bbf\u95ee\u4efb\u4f55\u504f\u79fb\u91cf\uff08offset\uff09\u7684\u6570\u636e\u3002<\/p>\n<ul>\n<li>\u5bf9\u4e8e\u7c7b\u578b\u5316\u7684\u6570\u7ec4\uff0c\u6784\u9020\u5668\u51b3\u5b9a\u4e86\u5176\u683c\u5f0f\u3002\u6574\u4e2a\u6570\u7ec4\u5e94\u8be5\u662f\u7edf\u4e00\u7684\u3002\u7b2c i \u4e2a\u6570\u5b57\u662f\u00a0<code>arr[i]<\/code>\u3002<\/li>\n<li>\u901a\u8fc7\u00a0<code>DataView<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>.getUint8(i)<\/code>\u00a0\u6216\u00a0<code>.getUint16(i)<\/code>\u00a0\u4e4b\u7c7b\u7684\u65b9\u6cd5\u8bbf\u95ee\u6570\u636e\u3002\u6211\u4eec\u5728\u8c03\u7528\u65b9\u6cd5\u65f6\u9009\u62e9\u683c\u5f0f\uff0c\u800c\u4e0d\u662f\u5728\u6784\u9020\u7684\u65f6\u5019\u3002<br \/>\n\u8bed\u6cd5\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">new DataView(buffer, [byteOffset], [byteLength])\n<\/code><\/pre>\n<ul>\n<li><strong><code>buffer<\/code><\/strong>\u00a0\u2014\u2014 \u5e95\u5c42\u7684\u00a0<code>ArrayBuffer<\/code>\u3002\u4e0e\u7c7b\u578b\u5316\u6570\u7ec4\u4e0d\u540c\uff0c<code>DataView<\/code>\u00a0\u4e0d\u4f1a\u81ea\u884c\u521b\u5efa\u7f13\u51b2\u533a\uff08buffer\uff09\u3002\u6211\u4eec\u9700\u8981\u4e8b\u5148\u51c6\u5907\u597d\u3002<\/li>\n<li><strong><code>byteOffset<\/code><\/strong>\u00a0\u2014\u2014 \u89c6\u56fe\u7684\u8d77\u59cb\u5b57\u8282\u4f4d\u7f6e\uff08\u9ed8\u8ba4\u4e3a 0\uff09\u3002<\/li>\n<li><strong><code>byteLength<\/code><\/strong>\u00a0\u2014\u2014 \u89c6\u56fe\u7684\u5b57\u8282\u957f\u5ea6\uff08\u9ed8\u8ba4\u81f3\u00a0<code>buffer<\/code>\u00a0\u7684\u672b\u5c3e\uff09\u3002<br \/>\n\u4f8b\u5982\uff0c\u8fd9\u91cc\u6211\u4eec\u4ece\u540c\u4e00\u4e2a buffer \u4e2d\u63d0\u53d6\u4e0d\u540c\u683c\u5f0f\u7684\u6570\u5b57\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">\/\/ 4 \u4e2a\u5b57\u8282\u7684\u4e8c\u8fdb\u5236\u6570\u7ec4\uff0c\u6bcf\u4e2a\u90fd\u662f\u6700\u5927\u503c 255\nlet buffer = new Uint8Array([255, 255, 255, 255]).buffer;\n\nlet dataView = new DataView(buffer);\n\n\/\/ \u5728\u504f\u79fb\u91cf\u4e3a 0 \u5904\u83b7\u53d6 8 \u4f4d\u6570\u5b57\nalert( dataView.getUint8(0) ); \/\/ 255\n\n\/\/ \u73b0\u5728\u5728\u504f\u79fb\u91cf\u4e3a 0 \u5904\u83b7\u53d6 16 \u4f4d\u6570\u5b57\uff0c\u5b83\u7531 2 \u4e2a\u5b57\u8282\u7ec4\u6210\uff0c\u4e00\u8d77\u89e3\u6790\u4e3a 65535\nalert( dataView.getUint16(0) ); \/\/ 65535\uff08\u6700\u5927\u7684 16 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\uff09\n\n\/\/ \u5728\u504f\u79fb\u91cf\u4e3a 0 \u5904\u83b7\u53d6 32 \u4f4d\u6570\u5b57\nalert( dataView.getUint32(0) ); \/\/ 4294967295\uff08\u6700\u5927\u7684 32 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\uff09\n\ndataView.setUint32(0, 0); \/\/ \u5c06 4 \u4e2a\u5b57\u8282\u7684\u6570\u5b57\u8bbe\u4e3a 0\uff0c\u5373\u5c06\u6240\u6709\u5b57\u8282\u90fd\u8bbe\u4e3a 0\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u5c06\u6df7\u5408\u683c\u5f0f\u7684\u6570\u636e\u5b58\u50a8\u5728\u540c\u4e00\u7f13\u51b2\u533a\uff08buffer\uff09\u4e2d\u65f6\uff0c<code>DataView<\/code>\u00a0\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5f53\u6211\u4eec\u5b58\u50a8\u4e00\u4e2a\u6210\u5bf9\u5e8f\u5217\uff0816 \u4f4d\u6574\u6570\uff0c32 \u4f4d\u6d6e\u70b9\u6570\uff09\u65f6\uff0c\u7528\u00a0<code>DataView<\/code>\u00a0\u53ef\u4ee5\u8f7b\u677e\u8bbf\u95ee\u5b83\u4eec\u3002<\/p>\n<h1>TextDecoder \u548c TextEncoder<\/h1>\n<p>\u5982\u679c\u4e8c\u8fdb\u5236\u6570\u636e\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u600e\u4e48\u529e\uff1f\u4f8b\u5982\uff0c\u6211\u4eec\u6536\u5230\u4e86\u4e00\u4e2a\u5305\u542b\u6587\u672c\u6570\u636e\u7684\u6587\u4ef6\u3002<br \/>\n\u5185\u5efa\u7684\u00a0<a href=\"https:\/\/encoding.spec.whatwg.org\/#interface-textdecoder\">TextDecoder<\/a>\u00a0\u5bf9\u8c61\u5728\u7ed9\u5b9a\u7f13\u51b2\u533a\uff08buffer\uff09\u548c\u7f16\u7801\u683c\u5f0f\uff08encoding\uff09\u7684\u60c5\u51b5\u4e0b\uff0c\u5141\u8bb8\u5c06\u503c\u8bfb\u53d6\u4e3a\u5b9e\u9645\u7684 JavaScript \u5b57\u7b26\u4e32\u3002<br \/>\n\u9996\u5148\u6211\u4eec\u9700\u8981\u521b\u5efa\uff1a<\/p>\n<pre><code class=\"language-js\">let decoder = new TextDecoder(<span class='badge badge-primary'><\/span>, [options]);\n<\/code><\/pre>\n<ul>\n<li><strong><code>label<\/code><\/strong>\u00a0\u2014\u2014 \u7f16\u7801\u683c\u5f0f\uff0c\u9ed8\u8ba4\u4e3a\u00a0<code>utf-8<\/code>\uff0c\u4f46\u540c\u65f6\u4e5f\u652f\u6301\u00a0<code>big5<\/code>\uff0c<code>windows-1251<\/code>\u00a0\u7b49\u8bb8\u591a\u5176\u4ed6\u7f16\u7801\u683c\u5f0f\u3002<\/li>\n<li><strong><code>options<\/code><\/strong>\u00a0\u2014\u2014 \u53ef\u9009\u5bf9\u8c61\uff1a\n<ul>\n<li><strong><code>fatal<\/code><\/strong>\u00a0\u2014\u2014 \u5e03\u5c14\u503c\uff0c\u5982\u679c\u4e3a\u00a0<code>true<\/code>\u00a0\u5219\u4e3a\u65e0\u6548\uff08\u4e0d\u53ef\u89e3\u7801\uff09\u5b57\u7b26\u629b\u51fa\u5f02\u5e38\uff0c\u5426\u5219\uff08\u9ed8\u8ba4\uff09\u7528\u5b57\u7b26\u00a0<code>\\uFFFD<\/code>\u00a0\u66ff\u6362\u65e0\u6548\u5b57\u7b26\u3002<\/li>\n<li><strong><code>ignoreBOM<\/code><\/strong>\u00a0\u2014\u2014 \u5e03\u5c14\u503c\uff0c\u5982\u679c\u4e3a\u00a0<code>true<\/code>\u00a0\u5219\u5ffd\u7565 BOM\uff08\u53ef\u9009\u7684\u5b57\u8282\u987a\u5e8f Unicode \u6807\u8bb0\uff09\uff0c\u5f88\u5c11\u9700\u8981\u4f7f\u7528\u3002<br \/>\n\u2026\u2026\u7136\u540e\u89e3\u7801\uff1a<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let str = decoder.decode([input], [options]);\n<\/code><\/pre>\n<ul>\n<li><strong><code>input<\/code><\/strong>\u00a0\u2014\u2014 \u8981\u88ab\u89e3\u7801\u7684\u00a0<code>BufferSource<\/code>\u3002<\/li>\n<li><strong><code>options<\/code><\/strong>\u00a0\u2014\u2014 \u53ef\u9009\u5bf9\u8c61\uff1a\n<ul>\n<li><strong><code>stream<\/code><\/strong>\u00a0\u2014\u2014 \u5bf9\u4e8e\u89e3\u7801\u6d41\uff0c\u4e3a true\uff0c\u5219\u5c06\u4f20\u5165\u7684\u6570\u636e\u5757\uff08chunk\uff09\u4f5c\u4e3a\u53c2\u6570\u91cd\u590d\u8c03\u7528\u00a0<code>decoder<\/code>\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u591a\u5b57\u8282\u7684\u5b57\u7b26\u53ef\u80fd\u5076\u5c14\u4f1a\u5728\u5757\u4e0e\u5757\u4e4b\u95f4\u88ab\u5206\u5272\u3002\u8fd9\u4e2a\u9009\u9879\u544a\u8bc9\u00a0<code>TextDecoder<\/code>\u00a0\u8bb0\u4f4f\u201c\u672a\u5b8c\u6210\u201d\u7684\u5b57\u7b26\uff0c\u5e76\u5728\u4e0b\u4e00\u4e2a\u6570\u636e\u5757\u6765\u7684\u65f6\u5019\u8fdb\u884c\u89e3\u7801\u3002<br \/>\n\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let uint8Array = new Uint8Array([72, 101, 108, 108, 111]);\n\nalert( new TextDecoder().decode(uint8Array) ); \/\/ Hello\n<\/code><\/pre>\n<pre><code class=\"language-js\">let uint8Array = new Uint8Array([228, 189, 160, 229, 165, 189]);\n\nalert( new TextDecoder().decode(uint8Array) ); \/\/ \u4f60\u597d\n<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u5176\u521b\u5efa\u5b50\u6570\u7ec4\u89c6\u56fe\u6765\u89e3\u7801\u90e8\u5206\u7f13\u51b2\u533a\uff1a<\/p>\n<pre><code class=\"language-js\">let uint8Array = new Uint8Array([0, 72, 101, 108, 108, 111, 0]);\n\n\/\/ \u8be5\u5b57\u7b26\u4e32\u4f4d\u4e8e\u4e2d\u95f4\n\/\/ \u5728\u4e0d\u590d\u5236\u4efb\u4f55\u5185\u5bb9\u7684\u524d\u63d0\u4e0b\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u89c6\u56fe\nlet binaryString = uint8Array.subarray(1, -1);\n\nalert( new TextDecoder().decode(binaryString) ); \/\/ Hello\n<\/code><\/pre>\n<h2>TextEncoder<\/h2>\n<p><a href=\"https:\/\/encoding.spec.whatwg.org\/#interface-textencoder\">TextEncoder<\/a>\u00a0\u505a\u76f8\u53cd\u7684\u4e8b\u60c5 \u2014\u2014 \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u8282\u3002<br \/>\n\u8bed\u6cd5\u4e3a\uff1a<\/p>\n<pre><code class=\"language-js\">let encoder = new TextEncoder();\n<\/code><\/pre>\n<p>\u53ea\u652f\u6301\u00a0<code>utf-8<\/code>\u00a0\u7f16\u7801\u3002<br \/>\n\u5b83\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><strong><code>encode(str)<\/code><\/strong>\u00a0\u2014\u2014 \u4ece\u5b57\u7b26\u4e32\u8fd4\u56de\u00a0<code>Uint8Array<\/code>\u3002<\/li>\n<li><strong><code>encodeInto(str, destination)<\/code><\/strong>\u00a0\u2014\u2014 \u5c06\u00a0<code>str<\/code>\u00a0\u7f16\u7801\u5230\u00a0<code>destination<\/code>\u00a0\u4e2d\uff0c\u8be5\u76ee\u6807\u5fc5\u987b\u4e3a\u00a0<code>Uint8Array<\/code>\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-js\">let encoder = new TextEncoder();\n\nlet uint8Array = encoder.encode(&quot;Hello&quot;);\nalert(uint8Array); \/\/ 72,101,108,108,111\n<\/code><\/pre>\n<h1>Blob<\/h1>\n<p><code>arrayBuffer<\/code>\u00a0\u548c\u89c6\u56fe\uff08view\uff09\u90fd\u662f ECMA \u6807\u51c6\u7684\u4e00\u90e8\u5206\uff0c\u662f JavaScript \u7684\u4e00\u90e8\u5206\u3002<br \/>\n\u5728\u6d4f\u89c8\u5668\u4e2d\uff0c\u8fd8\u6709\u5176\u4ed6\u66f4\u9ad8\u7ea7\u7684\u5bf9\u8c61\uff0c\u7279\u522b\u662f\u00a0<code>Blob<\/code>\uff0c\u5728\u00a0<a href=\"https:\/\/www.w3.org\/TR\/FileAPI\/\">File API<\/a>\u00a0\u4e2d\u6709\u76f8\u5173\u63cf\u8ff0\u3002<br \/>\n<code>Blob<\/code>\u00a0\u7531\u4e00\u4e2a\u53ef\u9009\u7684\u5b57\u7b26\u4e32\u00a0<code>type<\/code>\uff08\u901a\u5e38\u662f MIME \u7c7b\u578b\uff09\u548c\u00a0<code>blobParts<\/code>\u00a0\u7ec4\u6210 \u2014\u2014 \u4e00\u7cfb\u5217\u5176\u4ed6\u00a0<code>Blob<\/code>\u00a0\u5bf9\u8c61\uff0c\u5b57\u7b26\u4e32\u548c\u00a0<code>BufferSource<\/code>\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-20240628000437.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-20240628000437.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20240628000437.png\"><\/div><br \/>\n\u6784\u9020\u51fd\u6570\u7684\u8bed\u6cd5\u4e3a\uff1a<\/p>\n<pre><code class=\"language-js\">new Blob(blobParts, options);\n<\/code><\/pre>\n<ul>\n<li><strong><code>blobParts<\/code><\/strong>\u00a0\u662f\u00a0<code>Blob<\/code>\/<code>BufferSource<\/code>\/<code>String<\/code>\u00a0\u7c7b\u578b\u7684\u503c\u7684\u6570\u7ec4\u3002<\/li>\n<li><strong><code>options<\/code><\/strong>\u00a0\u53ef\u9009\u5bf9\u8c61\uff1a\n<ul>\n<li><strong><code>type<\/code><\/strong>\u00a0\u2014\u2014\u00a0<code>Blob<\/code>\u00a0\u7c7b\u578b\uff0c\u901a\u5e38\u662f MIME \u7c7b\u578b\uff0c\u4f8b\u5982\u00a0<code>image\/png<\/code>\uff0c<\/li>\n<li><strong><code>endings<\/code><\/strong>\u00a0\u2014\u2014 \u662f\u5426\u8f6c\u6362\u6362\u884c\u7b26\uff0c\u4f7f\u00a0<code>Blob<\/code>\u00a0\u5bf9\u5e94\u4e8e\u5f53\u524d\u64cd\u4f5c\u7cfb\u7edf\u7684\u6362\u884c\u7b26\uff08<code>\\r\\n<\/code>\u00a0\u6216\u00a0<code>\\n<\/code>\uff09\u3002\u9ed8\u8ba4\u4e3a\u00a0<code>&quot;transparent&quot;<\/code>\uff08\u5565\u4e5f\u4e0d\u505a\uff09\uff0c\u4e0d\u8fc7\u4e5f\u53ef\u4ee5\u662f\u00a0<code>&quot;native&quot;<\/code>\uff08\u8f6c\u6362\uff09\u3002<br \/>\n\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre><code class=\"language-js\">\/\/ \u4ece\u5b57\u7b26\u4e32\u521b\u5efa Blob\nlet blob = new Blob([&quot;&lt;html&gt;\u2026&lt;\/html&gt;&quot;], {type: 'text\/html'});\n\/\/ \u8bf7\u6ce8\u610f\uff1a\u7b2c\u4e00\u4e2a\u53c2\u6570\u5fc5\u987b\u662f\u4e00\u4e2a\u6570\u7ec4 [...]\n<\/code><\/pre>\n<pre><code class=\"language-js\">\/\/ \u4ece\u7c7b\u578b\u5316\u6570\u7ec4\uff08typed array\uff09\u548c\u5b57\u7b26\u4e32\u521b\u5efa Blob\nlet hello = new Uint8Array([72, 101, 108, 108, 111]); \/\/ \u4e8c\u8fdb\u5236\u683c\u5f0f\u7684 &quot;hello&quot;\n\nlet blob = new Blob([hello, ' ', 'world'], {type: 'text\/plain'});\n<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u7528\u00a0<code>slice<\/code>\u00a0\u65b9\u6cd5\u6765\u63d0\u53d6\u00a0<code>Blob<\/code>\u00a0\u7247\u6bb5\uff1a<\/p>\n<pre><code class=\"language-js\">blob.slice([byteStart], [byteEnd], [contentType]);\n<\/code><\/pre>\n<ul>\n<li><strong><code>byteStart<\/code><\/strong>\u00a0\u2014\u2014 \u8d77\u59cb\u5b57\u8282\uff0c\u9ed8\u8ba4\u4e3a 0\u3002<\/li>\n<li><strong><code>byteEnd<\/code><\/strong>\u00a0\u2014\u2014 \u6700\u540e\u4e00\u4e2a\u5b57\u8282\uff08\u4e0d\u5305\u62ec\uff0c\u9ed8\u8ba4\u4e3a\u6700\u540e\uff09\u3002<\/li>\n<li><strong><code>contentType<\/code><\/strong>\u00a0\u2014\u2014 \u65b0 blob \u7684\u00a0<code>type<\/code>\uff0c\u9ed8\u8ba4\u4e0e\u6e90 blob \u76f8\u540c\u3002<br \/>\n\u53c2\u6570\u503c\u7c7b\u4f3c\u4e8e\u00a0<code>array.slice<\/code>\uff0c\u4e5f\u5141\u8bb8\u662f\u8d1f\u6570\u3002<\/li>\n<\/ul>\n<blockquote>\n<p><code>Blob<\/code>\u00a0\u5bf9\u8c61\u662f\u4e0d\u53ef\u6539\u53d8\u7684<br \/>\n\u6211\u4eec\u65e0\u6cd5\u76f4\u63a5\u5728\u00a0<code>Blob<\/code>\u00a0\u4e2d\u66f4\u6539\u6570\u636e\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u00a0<code>slice<\/code>\u00a0\u83b7\u5f97\u00a0<code>Blob<\/code>\u00a0\u7684\u591a\u4e2a\u90e8\u5206\uff0c\u4ece\u8fd9\u4e9b\u90e8\u5206\u521b\u5efa\u65b0\u7684\u00a0<code>Blob<\/code>\u00a0\u5bf9\u8c61\uff0c\u5c06\u5b83\u4eec\u7ec4\u6210\u65b0\u7684\u00a0<code>Blob<\/code>\uff0c\u7b49\u3002<br \/>\n\u8fd9\u79cd\u884c\u4e3a\u7c7b\u4f3c\u4e8e JavaScript \u5b57\u7b26\u4e32\uff1a\u6211\u4eec\u65e0\u6cd5\u66f4\u6539\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\uff0c\u4f46\u53ef\u4ee5\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u6539\u52a8\u8fc7\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<\/blockquote>\n<h2>Blob \u7528\u4f5c URL<\/h2>\n<p>Blob \u53ef\u4ee5\u5f88\u5bb9\u6613\u7528\u4f5c\u00a0<code>&lt;a&gt;<\/code>\u3001<code>&lt;img&gt;<\/code>\u00a0\u6216\u5176\u4ed6\u6807\u7b7e\u7684 URL\uff0c\u6765\u663e\u793a\u5b83\u4eec\u7684\u5185\u5bb9\u3002<br \/>\n\u591a\u4e8f\u4e86\u00a0<code>type<\/code>\uff0c\u8ba9\u6211\u4eec\u4e5f\u53ef\u4ee5\u4e0b\u8f7d\/\u4e0a\u4f20\u00a0<code>Blob<\/code>\u00a0\u5bf9\u8c61\uff0c\u800c\u5728\u7f51\u7edc\u8bf7\u6c42\u4e2d\uff0c<code>type<\/code>\u00a0\u81ea\u7136\u5730\u53d8\u6210\u4e86\u00a0<code>Content-Type<\/code>\u3002<br \/>\n\u8ba9\u6211\u4eec\u4ece\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u5f00\u59cb\u3002\u901a\u8fc7\u70b9\u51fb\u94fe\u63a5\uff0c\u4f60\u53ef\u4ee5\u4e0b\u8f7d\u4e00\u4e2a\u5177\u6709\u52a8\u6001\u751f\u6210\u7684\u5185\u5bb9\u4e3a\u00a0<code>hello world<\/code>\u00a0\u7684\u00a0<code>Blob<\/code>\u00a0\u7684\u6587\u4ef6\uff1a<\/p>\n<pre><code class=\"language-js\">&lt;!-- download \u7279\u6027\uff08attribute\uff09\u5f3a\u5236\u6d4f\u89c8\u5668\u4e0b\u8f7d\u800c\u4e0d\u662f\u5bfc\u822a --&gt;\n&lt;a download=&quot;hello.txt&quot; href='#' id=&quot;link&quot;&gt;Download&lt;\/a&gt;\n\n&lt;script&gt;\nlet blob = new Blob([&quot;Hello, world!&quot;], {type: 'text\/plain'});\n\nlink.href = URL.createObjectURL(blob);\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728 Javascript \u4e2d\u52a8\u6001\u521b\u5efa\u4e00\u4e2a\u94fe\u63a5\uff0c\u901a\u8fc7\u00a0<code>link.click()<\/code>\u00a0\u6a21\u62df\u4e00\u4e2a\u70b9\u51fb\uff0c\u7136\u540e\u4fbf\u81ea\u52a8\u4e0b\u8f7d\u4e86\u3002<br \/>\n\u4e0b\u9762\u662f\u7c7b\u4f3c\u7684\u4ee3\u7801\uff0c\u6b64\u4ee3\u7801\u53ef\u4ee5\u8ba9\u7528\u6237\u65e0\u9700\u4efb\u4f55 HTML \u5373\u53ef\u4e0b\u8f7d\u52a8\u6001\u751f\u6210\u7684\u00a0<code>Blob<\/code>\uff08\u8bd1\u6ce8\uff1a\u4e5f\u5c31\u662f\u901a\u8fc7\u4ee3\u7801\u6a21\u62df\u7528\u6237\u70b9\u51fb\uff0c\u4ece\u800c\u81ea\u52a8\u4e0b\u8f7d\uff09\uff1a<\/p>\n<pre><code class=\"language-js\">let link = document.createElement('a');\nlink.download = 'hello.txt';\n\nlet blob = new Blob(['Hello, world!'], {type: 'text\/plain'});\n\nlink.href = URL.createObjectURL(blob);\n\nlink.click();\n\nURL.revokeObjectURL(link.href);\n<\/code><\/pre>\n<p><code>URL.createObjectURL<\/code>\u00a0\u53d6\u4e00\u4e2a\u00a0<code>Blob<\/code>\uff0c\u5e76\u4e3a\u5176\u521b\u5efa\u4e00\u4e2a\u552f\u4e00\u7684 URL\uff0c\u5f62\u5f0f\u4e3a\u00a0<code>blob:&lt;origin&gt;\/&lt;uuid&gt;<\/code>\u3002<br \/>\n\u4e5f\u5c31\u662f\u00a0<code>link.href<\/code>\u00a0\u7684\u503c\u7684\u6837\u5b50\uff1a<\/p>\n<pre><code class=\"language-Text\">blob:https:\/\/javascript.info\/1e67e00e-860d-40a5-89ae-6ab0cbee6273\n<\/code><\/pre>\n<p>\u6d4f\u89c8\u5668\u5185\u90e8\u4e3a\u6bcf\u4e2a\u901a\u8fc7\u00a0<code>URL.createObjectURL<\/code>\u00a0\u751f\u6210\u7684 URL \u5b58\u50a8\u4e86\u4e00\u4e2a URL \u2192\u00a0<code>Blob<\/code>\u00a0\u6620\u5c04\u3002\u56e0\u6b64\uff0c\u6b64\u7c7b URL \u5f88\u77ed\uff0c\u4f46\u53ef\u4ee5\u8bbf\u95ee\u00a0<code>Blob<\/code>\u3002<br \/>\n\u751f\u6210\u7684 URL\uff08\u5373\u5176\u94fe\u63a5\uff09\u4ec5\u5728\u5f53\u524d\u6587\u6863\u6253\u5f00\u7684\u72b6\u6001\u4e0b\u624d\u6709\u6548\u3002\u5b83\u5141\u8bb8\u5f15\u7528\u00a0<code>&lt;img&gt;<\/code>\u3001<code>&lt;a&gt;<\/code>\u00a0\u4e2d\u7684\u00a0<code>Blob<\/code>\uff0c\u4ee5\u53ca\u57fa\u672c\u4e0a\u4efb\u4f55\u5176\u4ed6\u671f\u671b URL \u7684\u5bf9\u8c61\u3002<br \/>\n\u4e0d\u8fc7\u5b83\u6709\u4e2a\u526f\u4f5c\u7528\u3002\u867d\u7136\u8fd9\u91cc\u6709\u00a0<code>Blob<\/code>\u00a0\u7684\u6620\u5c04\uff0c\u4f46\u00a0<code>Blob<\/code>\u00a0\u672c\u8eab\u53ea\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\u7684\u3002\u6d4f\u89c8\u5668\u65e0\u6cd5\u91ca\u653e\u5b83\u3002<br \/>\n\u5728\u6587\u6863\u9000\u51fa\u65f6\uff08unload\uff09\uff0c\u8be5\u6620\u5c04\u4f1a\u88ab\u81ea\u52a8\u6e05\u9664\uff0c\u56e0\u6b64\u00a0<code>Blob<\/code>\u00a0\u4e5f\u76f8\u5e94\u88ab\u91ca\u653e\u4e86\u3002\u4f46\u662f\uff0c\u5982\u679c\u5e94\u7528\u7a0b\u5e8f\u5bff\u547d\u5f88\u957f\uff0c\u90a3\u8fd9\u4e2a\u91ca\u653e\u5c31\u4e0d\u4f1a\u5f88\u5feb\u53d1\u751f\u3002<br \/>\n<strong>\u56e0\u6b64\uff0c\u5982\u679c\u6211\u4eec\u521b\u5efa\u4e00\u4e2a URL\uff0c\u90a3\u4e48\u5373\u4f7f\u6211\u4eec\u4e0d\u518d\u9700\u8981\u8be5\u00a0<code>Blob<\/code>\u00a0\u4e86\uff0c\u5b83\u4e5f\u4f1a\u88ab\u6302\u5728\u5185\u5b58\u4e2d\u3002<\/strong><br \/>\n<code>URL.revokeObjectURL(url)<\/code>\u00a0\u4ece\u5185\u90e8\u6620\u5c04\u4e2d\u79fb\u9664\u5f15\u7528\uff0c\u56e0\u6b64\u5141\u8bb8\u00a0<code>Blob<\/code>\u00a0\u88ab\u5220\u9664\uff08\u5982\u679c\u6ca1\u6709\u5176\u4ed6\u5f15\u7528\u7684\u8bdd\uff09\uff0c\u5e76\u91ca\u653e\u5185\u5b58\u3002<br \/>\n\u5728\u4e0a\u9762\u6700\u540e\u4e00\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u6253\u7b97\u4ec5\u4f7f\u7528\u4e00\u6b21\u00a0<code>Blob<\/code>\uff0c\u6765\u8fdb\u884c\u5373\u65f6\u4e0b\u8f7d\uff0c\u56e0\u6b64\u6211\u4eec\u7acb\u5373\u8c03\u7528\u00a0<code>URL.revokeObjectURL(link.href)<\/code>\u3002<br \/>\n\u800c\u5728\u524d\u4e00\u4e2a\u5e26\u6709\u53ef\u70b9\u51fb\u7684 HTML \u94fe\u63a5\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4e0d\u8c03\u7528\u00a0<code>URL.revokeObjectURL(link.href)<\/code>\uff0c\u56e0\u4e3a\u90a3\u6837\u4f1a\u4f7f\u00a0<code>Blob<\/code>\u00a0URL \u65e0\u6548\u3002\u5728\u8c03\u7528\u8be5\u65b9\u6cd5\u540e\uff0c\u7531\u4e8e\u6620\u5c04\u88ab\u5220\u9664\u4e86\uff0c\u56e0\u6b64\u8be5 URL \u4e5f\u5c31\u4e0d\u518d\u8d77\u4f5c\u7528\u4e86\u3002<\/p>\n<h2>Blob \u8f6c\u6362\u4e3a base64<\/h2>\n<p><code>URL.createObjectURL<\/code>\u00a0\u7684\u4e00\u4e2a\u66ff\u4ee3\u65b9\u6cd5\u662f\uff0c\u5c06\u00a0<code>Blob<\/code>\u00a0\u8f6c\u6362\u4e3a base64-\u7f16\u7801\u7684\u5b57\u7b26\u4e32\u3002<br \/>\n\u8fd9\u79cd\u7f16\u7801\u5c06\u4e8c\u8fdb\u5236\u6570\u636e\u8868\u793a\u4e3a\u4e00\u4e2a\u7531 0 \u5230 64 \u7684 ASCII \u7801\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\uff0c\u975e\u5e38\u5b89\u5168\u4e14\u201c\u53ef\u8bfb\u201c\u3002\u66f4\u91cd\u8981\u7684\u662f \u2014\u2014 \u6211\u4eec\u53ef\u4ee5\u5728 \u201cdata-url\u201d \u4e2d\u4f7f\u7528\u6b64\u7f16\u7801\u3002<br \/>\n<a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/http\/Data_URIs\">\u201cdata-url\u201d<\/a>\u00a0\u7684\u5f62\u5f0f\u4e3a\u00a0<code>data:[&lt;mediatype&gt;][;base64],&lt;data&gt;<\/code>\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u4efb\u4f55\u5730\u65b9\u4f7f\u7528\u8fd9\u79cd url\uff0c\u548c\u4f7f\u7528\u201c\u5e38\u89c4\u201d url \u4e00\u6837\u3002<br \/>\n\u4f8b\u5982\uff0c\u8fd9\u662f\u4e00\u4e2a\u7b11\u8138\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;img src=&quot;data:image\/png;base64,R0lGODlhDAAMAKIFAF5LAP\/zxAAAANyuAP\/gaP\/\/\/wAAAAAAACH5BAEAAAUALAAAAAAMAAwAAAMlWLPcGjDKFYi9lxKBOaGcF35DhWHamZUW0K4mAbiwWtuf0uxFAgA7&quot;&gt;\n<\/code><\/pre>\n<p>\u6d4f\u89c8\u5668\u5c06\u89e3\u7801\u8be5\u5b57\u7b26\u4e32\uff0c\u5e76\u663e\u793a\u56fe\u50cf\uff1a&lt;img src=&quot;data:image\/png;base64,R0lGODlhDAAMAKIFAF5LAP\/zxAAAANyuAP\/gaP\/\/\/wAAAAAAACH5BAEAAAUALAAAAAAMAAwAAAMlWLPcGjDKFYi9lxKBOaGcF35DhWHamZUW0K4mAbiwWtuf0uxFAgA7&quot;&gt;\u6211\u4eec\u4f7f\u7528\u5185\u5efa\u7684\u00a0<code>FileReader<\/code>\u00a0\u5bf9\u8c61\u6765\u5c06\u00a0<code>Blob<\/code>\u00a0\u8f6c\u6362\u4e3a base64\u3002\u5b83\u53ef\u4ee5\u5c06\u00a0<code>Blob<\/code>\u00a0\u4e2d\u7684\u6570\u636e\u8bfb\u53d6\u4e3a\u591a\u79cd\u683c\u5f0f\u3002\u5728<a href=\"https:\/\/zh.javascript.info\/file\">\u4e0b\u4e00\u7ae0<\/a>\u00a0\u6211\u4eec\u5c06\u66f4\u6df1\u5165\u5730\u4ecb\u7ecd\u5b83\u3002<br \/>\n\u4e0b\u9762\u662f\u4e0b\u8f7d\u00a0<code>Blob<\/code>\u00a0\u7684\u793a\u4f8b\uff0c\u8fd9\u6b21\u662f\u901a\u8fc7 base-64\uff1a<\/p>\n<pre><code class=\"language-js\">let link = document.createElement('a');\nlink.download = 'hello.txt';\n\nlet blob = new Blob(['Hello, world!'], {type: 'text\/plain'});\n\nlet reader = new FileReader();\nreader.readAsDataURL(blob); \/\/ \u5c06 Blob \u8f6c\u6362\u4e3a base64 \u5e76\u8c03\u7528 onload\n\nreader.onload = function() {\n  link.href = reader.result; \/\/ data url\n  link.click();\n};\n<\/code><\/pre>\n<p>\u8fd9\u4e24\u79cd\u4ece\u00a0<code>Blob<\/code>\u00a0\u521b\u5efa URL \u7684\u65b9\u6cd5\u90fd\u53ef\u4ee5\u7528\u3002\u4f46\u901a\u5e38\u00a0<code>URL.createObjectURL(blob)<\/code>\u00a0\u66f4\u7b80\u5355\u5feb\u6377\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240628001538.png\" alt=\"Pasted image 20240628001538.png\"><\/p>\n<h2>Image \u8f6c\u6362\u4e3a blob<\/h2>\n<p>\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u56fe\u50cf\uff08image\uff09\u7684\u3001\u56fe\u50cf\u7684\u4e00\u90e8\u5206\u3001\u6216\u8005\u751a\u81f3\u521b\u5efa\u4e00\u4e2a\u9875\u9762\u622a\u56fe\u7684\u00a0<code>Blob<\/code>\u3002\u8fd9\u6837\u65b9\u4fbf\u5c06\u5176\u4e0a\u4f20\u81f3\u5176\u4ed6\u5730\u65b9\u3002<br \/>\n\u56fe\u50cf\u64cd\u4f5c\u662f\u901a\u8fc7\u00a0<code>&lt;canvas&gt;<\/code>\u00a0\u5143\u7d20\u6765\u5b9e\u73b0\u7684\uff1a<\/p>\n<ol>\n<li>\u4f7f\u7528\u00a0<a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/api\/CanvasRenderingContext2D\/drawImage\">canvas.drawImage<\/a>\u00a0\u5728 canvas \u4e0a\u7ed8\u5236\u56fe\u50cf\uff08\u6216\u56fe\u50cf\u7684\u4e00\u90e8\u5206\uff09\u3002<\/li>\n<li>\u8c03\u7528 canvas \u65b9\u6cd5\u00a0<a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/api\/HTMLCanvasElement\/toBlob\">.toBlob(callback, format, quality)<\/a>\u00a0\u521b\u5efa\u4e00\u4e2a\u00a0<code>Blob<\/code>\uff0c\u5e76\u5728\u521b\u5efa\u5b8c\u6210\u540e\u4f7f\u7528\u5176\u8fd0\u884c\u00a0<code>callback<\/code>\u3002<br \/>\n\u5728\u4e0b\u9762\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u56fe\u50cf\u53ea\u662f\u88ab\u590d\u5236\u4e86\uff0c\u4e0d\u8fc7\u6211\u4eec\u53ef\u4ee5\u5728\u521b\u5efa blob \u4e4b\u524d\uff0c\u4ece\u4e2d\u88c1\u526a\u56fe\u50cf\uff0c\u6216\u8005\u5728 canvas \u4e0a\u5bf9\u5176\u8fdb\u884c\u8f6c\u6362\uff1a<\/li>\n<\/ol>\n<pre><code class=\"language-js\">\/\/ \u83b7\u53d6\u4efb\u4f55\u56fe\u50cf\nlet img = document.querySelector('img');\n\n\/\/ \u751f\u6210\u540c\u5c3a\u5bf8\u7684 &lt;canvas&gt;\nlet canvas = document.createElement('canvas');\ncanvas.width = img.clientWidth;\ncanvas.height = img.clientHeight;\n\nlet context = canvas.getContext('2d');\n\n\/\/ \u5411\u5176\u4e2d\u590d\u5236\u56fe\u50cf\uff08\u6b64\u65b9\u6cd5\u5141\u8bb8\u526a\u88c1\u56fe\u50cf\uff09\ncontext.drawImage(img, 0, 0);\n\/\/ \u6211\u4eec context.rotate()\uff0c\u5e76\u5728 canvas \u4e0a\u505a\u5f88\u591a\u5176\u4ed6\u4e8b\u60c5\n\n\/\/ toBlob \u662f\u5f02\u6b65\u64cd\u4f5c\uff0c\u7ed3\u675f\u540e\u4f1a\u8c03\u7528 callback\ncanvas.toBlob(function(blob) {\n  \/\/ blob \u521b\u5efa\u5b8c\u6210\uff0c\u4e0b\u8f7d\u5b83\n  let link = document.createElement('a');\n  link.download = 'example.png';\n\n  link.href = URL.createObjectURL(blob);\n  link.click();\n\n  \/\/ \u5220\u9664\u5185\u90e8 blob \u5f15\u7528\uff0c\u8fd9\u6837\u6d4f\u89c8\u5668\u53ef\u4ee5\u4ece\u5185\u5b58\u4e2d\u5c06\u5176\u6e05\u9664\n  URL.revokeObjectURL(link.href);\n}, 'image\/png');\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u66f4\u559c\u6b22\u00a0<code>async\/await<\/code>\u00a0\u800c\u4e0d\u662f callback\uff1a<\/p>\n<pre><code class=\"language-js\">let blob = await new Promise(resolve =&gt; canvasElem.toBlob(resolve, 'image\/png'));\n<\/code><\/pre>\n<p>\u5bf9\u4e8e\u9875\u9762\u622a\u5c4f\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8bf8\u5982\u00a0<a href=\"https:\/\/github.com\/niklasvh\/html2canvas\">https:\/\/github.com\/niklasvh\/html2canvas<\/a>\u00a0\u4e4b\u7c7b\u7684\u5e93\u3002\u5b83\u6240\u505a\u7684\u53ea\u662f\u626b\u4e00\u904d\u6d4f\u89c8\u5668\u9875\u9762\uff0c\u5e76\u5c06\u5176\u7ed8\u5236\u5728\u00a0<code>&lt;canvas&gt;<\/code>\u00a0\u4e0a\u3002\u7136\u540e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u50cf\u4e0a\u9762\u4e00\u6837\u83b7\u53d6\u4e00\u4e2a\u5b83\u7684\u00a0<code>Blob<\/code>\u3002<\/p>\n<h2>Blob \u8f6c\u6362\u4e3a ArrayBuffer<\/h2>\n<p><code>Blob<\/code>\u00a0\u6784\u9020\u5668\u5141\u8bb8\u4ece\u51e0\u4e4e\u4efb\u4f55\u4e1c\u897f\u521b\u5efa blob\uff0c\u5305\u62ec\u4efb\u4f55\u00a0<code>BufferSource<\/code>\u3002<br \/>\n\u4f46\u662f\uff0c\u5982\u679c\u6211\u4eec\u9700\u8981\u6267\u884c\u4f4e\u7ea7\u522b\u7684\u5904\u7406\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4ece\u00a0<code>blob.arrayBuffer()<\/code>\u00a0\u4e2d\u83b7\u53d6\u6700\u4f4e\u7ea7\u522b\u7684\u00a0<code>ArrayBuffer<\/code>\uff1a<\/p>\n<pre><code class=\"language-js\">\/\/ \u4ece blob \u83b7\u53d6 arrayBuffer\nconst bufferPromise = await blob.arrayBuffer();\n\n\/\/ \u6216\nblob.arrayBuffer().then(buffer =&gt; \/* \u5904\u7406 ArrayBuffer *\/);\n<\/code><\/pre>\n<h2>Blob \u8f6c\u6362\u4e3a Stream<\/h2>\n<p>\u5f53\u6211\u4eec\u8bfb\u53d6\u548c\u5199\u5165\u8d85\u8fc7\u00a0<code>2 GB<\/code>\u00a0\u7684 blob \u65f6\uff0c\u5c06\u5176\u8f6c\u6362\u4e3a\u00a0<code>arrayBuffer<\/code>\u00a0\u7684\u4f7f\u7528\u5bf9\u6211\u4eec\u6765\u8bf4\u4f1a\u66f4\u52a0\u5360\u7528\u5185\u5b58\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u5c06 blob \u8f6c\u6362\u4e3a stream \u8fdb\u884c\u5904\u7406\u3002<br \/>\nstream \u662f\u4e00\u79cd\u7279\u6b8a\u7684\u5bf9\u8c61\uff0c\u6211\u4eec\u53ef\u4ee5\u4ece\u5b83\u90a3\u91cc\u9010\u90e8\u5206\u5730\u8bfb\u53d6\uff08\u6216\u5199\u5165\uff09\u3002\u8fd9\u5757\u7684\u77e5\u8bc6\u70b9\u4e0d\u5728\u672c\u6587\u7684\u8303\u56f4\u4e4b\u5185\uff0c\u4f46\u8fd9\u91cc\u6709\u4e00\u4e2a\u4f8b\u5b50\uff0c\u4f60\u53ef\u4ee5\u5728\u00a0<a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Streams_API\">https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Streams_API<\/a>\u00a0\u4e86\u89e3\u66f4\u591a\u76f8\u5173\u5185\u5bb9\u3002\u5bf9\u4e8e\u9002\u5408\u9010\u6bb5\u5904\u7406\u7684\u6570\u636e\uff0c\u4f7f\u7528 stream \u662f\u5f88\u65b9\u4fbf\u7684\u3002<br \/>\n<code>Blob<\/code>\u00a0\u63a5\u53e3\u91cc\u7684\u00a0<code>stream()<\/code>\u00a0\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u00a0<code>ReadableStream<\/code>\uff0c\u5728\u88ab\u8bfb\u53d6\u65f6\u53ef\u4ee5\u8fd4\u56de\u00a0<code>Blob<\/code>\u00a0\u4e2d\u5305\u542b\u7684\u6570\u636e\u3002<br \/>\n\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre><code class=\"language-js\">\/\/ \u4ece blob \u83b7\u53d6\u53ef\u8bfb\u6d41\uff08readableStream\uff09\nconst readableStream = blob.stream();\nconst stream = readableStream.getReader();\n\nwhile (true) {\n  \/\/ \u5bf9\u4e8e\u6bcf\u6b21\u8fed\u4ee3\uff1avalue \u662f\u4e0b\u4e00\u4e2a blob \u6570\u636e\u7247\u6bb5\n  let { done, value } = await stream.read();\n  if (done) {\n    \/\/ \u8bfb\u53d6\u5b8c\u6bd5\uff0cstream \u91cc\u5df2\u7ecf\u6ca1\u6709\u6570\u636e\u4e86\n    console.log('all blob processed.');\n    break;\n  }\n\n  \/\/ \u5bf9\u521a\u4ece blob \u4e2d\u8bfb\u53d6\u7684\u6570\u636e\u7247\u6bb5\u505a\u4e00\u4e9b\u5904\u7406\n  console.log(value);\n}\n<\/code><\/pre>\n<h1>File \u548c FileReader<\/h1>\n<p><a href=\"https:\/\/www.w3.org\/TR\/FileAPI\/#dfn-file\">File<\/a>\u00a0\u5bf9\u8c61\u7ee7\u627f\u81ea\u00a0<code>Blob<\/code>\uff0c\u5e76\u6269\u5c55\u4e86\u4e0e\u6587\u4ef6\u7cfb\u7edf\u76f8\u5173\u7684\u529f\u80fd\u3002<br \/>\n\u6709\u4e24\u79cd\u65b9\u5f0f\u53ef\u4ee5\u83b7\u53d6\u5b83\u3002<br \/>\n\u7b2c\u4e00\u79cd\uff0c\u4e0e\u00a0<code>Blob<\/code>\u00a0\u7c7b\u4f3c\uff0c\u6709\u4e00\u4e2a\u6784\u9020\u5668\uff1a<\/p>\n<pre><code class=\"language-js\">new File(fileParts, fileName, [options])\n<\/code><\/pre>\n<ul>\n<li><strong><code>fileParts<\/code><\/strong>\u00a0\u2014\u2014 Blob\/BufferSource\/String \u7c7b\u578b\u503c\u7684\u6570\u7ec4\u3002<\/li>\n<li><strong><code>fileName<\/code><\/strong>\u00a0\u2014\u2014 \u6587\u4ef6\u540d\u5b57\u7b26\u4e32\u3002<\/li>\n<li><strong><code>options<\/code><\/strong>\u00a0\u2014\u2014 \u53ef\u9009\u5bf9\u8c61\uff1a\n<ul>\n<li><strong><code>lastModified<\/code><\/strong>\u00a0\u2014\u2014 \u6700\u540e\u4e00\u6b21\u4fee\u6539\u7684\u65f6\u95f4\u6233\uff08\u6574\u6570\u65e5\u671f\uff09\u3002<br \/>\n\u7b2c\u4e8c\u79cd\uff0c\u66f4\u5e38\u89c1\u7684\u662f\uff0c\u6211\u4eec\u4ece\u00a0<code>&lt;input type=&quot;file&quot;&gt;<\/code>\u00a0\u6216\u62d6\u653e\u6216\u5176\u4ed6\u6d4f\u89c8\u5668\u63a5\u53e3\u6765\u83b7\u53d6\u6587\u4ef6\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cfile \u5c06\u4ece\u64cd\u4f5c\u7cfb\u7edf\uff08OS\uff09\u83b7\u5f97 this \u4fe1\u606f\u3002<br \/>\n\u7531\u4e8e\u00a0<code>File<\/code>\u00a0\u662f\u7ee7\u627f\u81ea\u00a0<code>Blob<\/code>\u00a0\u7684\uff0c\u6240\u4ee5\u00a0<code>File<\/code>\u00a0\u5bf9\u8c61\u5177\u6709\u76f8\u540c\u7684\u5c5e\u6027\uff0c\u9644\u52a0\uff1a<\/li>\n<\/ul>\n<\/li>\n<li><code>name<\/code>\u00a0\u2014\u2014 \u6587\u4ef6\u540d\uff0c<\/li>\n<li><code>lastModified<\/code>\u00a0\u2014\u2014 \u6700\u540e\u4e00\u6b21\u4fee\u6539\u7684\u65f6\u95f4\u6233\u3002<br \/>\n\u8fd9\u5c31\u662f\u6211\u4eec\u4ece\u00a0<code>&lt;input type=&quot;file&quot;&gt;<\/code>\u00a0\u4e2d\u83b7\u53d6\u00a0<code>File<\/code>\u00a0\u5bf9\u8c61\u7684\u65b9\u5f0f\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-html\">&lt;input type=&quot;file&quot; onchange=&quot;showFile(this)&quot;&gt;\n\n&lt;script&gt;\nfunction showFile(input) {\n  let file = input.files[0];\n\n  alert(`File name: ${file.name}`); \/\/ \u4f8b\u5982 my.png\n  alert(`Last modified: ${file.lastModified}`); \/\/ \u4f8b\u5982 1552830408824\n}\n&lt;\/script&gt;\n<\/code><\/pre>\n<blockquote>\n<p>\u8bf7\u6ce8\u610f\uff1a<br \/>\n\u8f93\u5165\uff08input\uff09\u53ef\u4ee5\u9009\u62e9\u591a\u4e2a\u6587\u4ef6\uff0c\u56e0\u6b64\u00a0<code>input.files<\/code>\u00a0\u662f\u4e00\u4e2a\u7c7b\u6570\u7ec4\u5bf9\u8c61\u3002\u8fd9\u91cc\u6211\u4eec\u53ea\u6709\u4e00\u4e2a\u6587\u4ef6\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u53d6\u00a0<code>input.files[0]<\/code>\u3002<\/p>\n<\/blockquote>\n<h2>FileReader<\/h2>\n<p><a href=\"https:\/\/www.w3.org\/TR\/FileAPI\/#dfn-filereader\">FileReader<\/a>\u00a0\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5176\u552f\u4e00\u76ee\u7684\u662f\u4ece\u00a0<code>Blob<\/code>\uff08\u56e0\u6b64\u4e5f\u4ece\u00a0<code>File<\/code>\uff09\u5bf9\u8c61\u4e2d\u8bfb\u53d6\u6570\u636e\u3002<br \/>\n\u5b83\u4f7f\u7528\u4e8b\u4ef6\u6765\u4f20\u9012\u6570\u636e\uff0c\u56e0\u4e3a\u4ece\u78c1\u76d8\u8bfb\u53d6\u6570\u636e\u53ef\u80fd\u6bd4\u8f83\u8d39\u65f6\u95f4\u3002<br \/>\n\u6784\u9020\u51fd\u6570\uff1a<\/p>\n<pre><code class=\"language-js\">let reader = new FileReader(); \/\/ \u6ca1\u6709\u53c2\u6570\n<\/code><\/pre>\n<p>\u4e3b\u8981\u65b9\u6cd5:<\/p>\n<ul>\n<li><strong><code>readAsArrayBuffer(blob)<\/code><\/strong>\u00a0\u2014\u2014 \u5c06\u6570\u636e\u8bfb\u53d6\u4e3a\u4e8c\u8fdb\u5236\u683c\u5f0f\u7684\u00a0<code>ArrayBuffer<\/code>\u3002<\/li>\n<li><strong><code>readAsText(blob, [encoding])<\/code><\/strong>\u00a0\u2014\u2014 \u5c06\u6570\u636e\u8bfb\u53d6\u4e3a\u7ed9\u5b9a\u7f16\u7801\uff08\u9ed8\u8ba4\u4e3a\u00a0<code>utf-8<\/code>\u00a0\u7f16\u7801\uff09\u7684\u6587\u672c\u5b57\u7b26\u4e32\u3002<\/li>\n<li><strong><code>readAsDataURL(blob)<\/code><\/strong>\u00a0\u2014\u2014 \u8bfb\u53d6\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5e76\u5c06\u5176\u7f16\u7801\u4e3a base64 \u7684 data url\u3002<\/li>\n<li><strong><code>abort()<\/code><\/strong>\u00a0\u2014\u2014 \u53d6\u6d88\u64cd\u4f5c\u3002<br \/>\n<code>read*<\/code>\u00a0\u65b9\u6cd5\u7684\u9009\u62e9\uff0c\u53d6\u51b3\u4e8e\u6211\u4eec\u559c\u6b22\u54ea\u79cd\u683c\u5f0f\uff0c\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u6570\u636e\u3002<\/li>\n<li><code>readAsArrayBuffer<\/code>\u00a0\u2014\u2014 \u7528\u4e8e\u4e8c\u8fdb\u5236\u6587\u4ef6\uff0c\u6267\u884c\u4f4e\u7ea7\u522b\u7684\u4e8c\u8fdb\u5236\u64cd\u4f5c\u3002\u5bf9\u4e8e\u8bf8\u5982\u5207\u7247\uff08slicing\uff09\u4e4b\u7c7b\u7684\u9ad8\u7ea7\u522b\u7684\u64cd\u4f5c\uff0c<code>File<\/code>\u00a0\u662f\u7ee7\u627f\u81ea\u00a0<code>Blob<\/code>\u00a0\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u8c03\u7528\u5b83\u4eec\uff0c\u800c\u65e0\u9700\u8bfb\u53d6\u3002<\/li>\n<li><code>readAsText<\/code>\u00a0\u2014\u2014 \u7528\u4e8e\u6587\u672c\u6587\u4ef6\uff0c\u5f53\u6211\u4eec\u60f3\u8981\u83b7\u53d6\u5b57\u7b26\u4e32\u65f6\u3002<\/li>\n<li><code>readAsDataURL<\/code>\u00a0\u2014\u2014 \u5f53\u6211\u4eec\u60f3\u5728\u00a0<code>src<\/code>\u00a0\u4e2d\u4f7f\u7528\u6b64\u6570\u636e\uff0c\u5e76\u5c06\u5176\u7528\u4e8e\u00a0<code>img<\/code>\u00a0\u6216\u5176\u4ed6\u6807\u7b7e\u65f6\u3002\u6b63\u5982\u6211\u4eec\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/blob\">Blob<\/a>\u00a0\u4e00\u7ae0\u4e2d\u6240\u8bb2\u7684\uff0c\u8fd8\u6709\u4e00\u79cd\u7528\u4e8e\u6b64\u7684\u8bfb\u53d6\u6587\u4ef6\u7684\u66ff\u4ee3\u65b9\u6848\uff1a<code>URL.createObjectURL(file)<\/code>\u3002<br \/>\n\u8bfb\u53d6\u8fc7\u7a0b\u4e2d\uff0c\u6709\u4ee5\u4e0b\u4e8b\u4ef6\uff1a<\/li>\n<li><code>loadstart<\/code>\u00a0\u2014\u2014 \u5f00\u59cb\u52a0\u8f7d\u3002<\/li>\n<li><code>progress<\/code>\u00a0\u2014\u2014 \u5728\u8bfb\u53d6\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u3002<\/li>\n<li><code>load<\/code>\u00a0\u2014\u2014 \u8bfb\u53d6\u5b8c\u6210\uff0c\u6ca1\u6709 error\u3002<\/li>\n<li><code>abort<\/code>\u00a0\u2014\u2014 \u8c03\u7528\u4e86\u00a0<code>abort()<\/code>\u3002<\/li>\n<li><code>error<\/code>\u00a0\u2014\u2014 \u51fa\u73b0 error\u3002<\/li>\n<li><code>loadend<\/code>\u00a0\u2014\u2014 \u8bfb\u53d6\u5b8c\u6210\uff0c\u65e0\u8bba\u6210\u529f\u8fd8\u662f\u5931\u8d25\u3002<br \/>\n\u8bfb\u53d6\u5b8c\u6210\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u8bbf\u95ee\u8bfb\u53d6\u7ed3\u679c\uff1a<\/li>\n<li><code>reader.result<\/code>\u00a0\u662f\u7ed3\u679c\uff08\u5982\u679c\u6210\u529f\uff09<\/li>\n<li><code>reader.error<\/code>\u00a0\u662f error\uff08\u5982\u679c\u5931\u8d25\uff09\u3002<br \/>\n\u4f7f\u7528\u6700\u5e7f\u6cdb\u7684\u4e8b\u4ef6\u65e0\u7591\u662f\u00a0<code>load<\/code>\u00a0\u548c\u00a0<code>error<\/code>\u3002<br \/>\n\u8fd9\u662f\u4e00\u4e2a\u8bfb\u53d6\u6587\u4ef6\u7684\u793a\u4f8b\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-html\">&lt;input type=&quot;file&quot; onchange=&quot;readFile(this)&quot;&gt;\n\n&lt;script&gt;\nfunction readFile(input) {\n  let file = input.files[0];\n\n  let reader = new FileReader();\n\n  reader.readAsText(file);\n\n  reader.onload = function() {\n    console.log(reader.result);\n  };\n\n  reader.onerror = function() {\n    console.log(reader.error);\n  };\n\n}\n&lt;\/script&gt;\n<\/code><\/pre>\n<blockquote>\n<p><code>FileReader<\/code>\u00a0\u7528\u4e8e blob<br \/>\n\u6b63\u5982\u6211\u4eec\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/blob\">Blob<\/a>\u00a0\u4e00\u7ae0\u4e2d\u6240\u63d0\u5230\u7684\uff0c<code>FileReader<\/code>\u00a0\u4e0d\u4ec5\u53ef\u8bfb\u53d6\u6587\u4ef6\uff0c\u8fd8\u53ef\u8bfb\u53d6\u4efb\u4f55 blob\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b83\u5c06 blob \u8f6c\u6362\u4e3a\u5176\u4ed6\u683c\u5f0f\uff1a<\/p>\n<ul>\n<li><code>readAsArrayBuffer(blob)<\/code>\u00a0\u2014\u2014 \u8f6c\u6362\u4e3a\u00a0<code>ArrayBuffer<\/code>\uff0c<\/li>\n<li><code>readAsText(blob, [encoding])<\/code>\u00a0\u2014\u2014 \u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff08<code>TextDecoder<\/code>\u00a0\u7684\u4e00\u4e2a\u66ff\u4ee3\u65b9\u6848\uff09\uff0c<\/li>\n<li><code>readAsDataURL(blob)<\/code>\u00a0\u2014\u2014 \u8f6c\u6362\u4e3a base64 \u7684 data url\u3002<\/li>\n<\/ul>\n<\/blockquote>\n<blockquote>\n<p>\u5728 Web Workers \u4e2d\u53ef\u4ee5\u4f7f\u7528\u00a0<code>FileReaderSync<\/code><br \/>\n\u5bf9\u4e8e Web Worker\uff0c\u8fd8\u6709\u4e00\u79cd\u540c\u6b65\u7684\u00a0<code>FileReader<\/code>\u00a0\u53d8\u4f53\uff0c\u79f0\u4e3a\u00a0<a href=\"https:\/\/www.w3.org\/TR\/FileAPI\/#FileReaderSync\">FileReaderSync<\/a>\u3002<br \/>\n\u5b83\u7684\u8bfb\u53d6\u65b9\u6cd5\u00a0<code>read*<\/code>\u00a0\u4e0d\u4f1a\u751f\u6210\u4e8b\u4ef6\uff0c\u4f46\u662f\u4f1a\u50cf\u5e38\u89c4\u51fd\u6570\u90a3\u6837\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u3002<br \/>\n\u4e0d\u8fc7\uff0c\u8fd9\u4ec5\u5728 Web Worker \u4e2d\u53ef\u7528\uff0c\u56e0\u4e3a\u5728\u8bfb\u53d6\u6587\u4ef6\u7684\u65f6\u5019\uff0c\u540c\u6b65\u8c03\u7528\u4f1a\u6709\u5ef6\u8fdf\uff0c\u800c\u5728 Web Worker \u4e2d\uff0c\u8fd9\u79cd\u5ef6\u8fdf\u5e76\u4e0d\u662f\u5f88\u91cd\u8981\u3002\u5b83\u4e0d\u4f1a\u5f71\u54cd\u9875\u9762\u3002<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>ArrayBuffer \u4e8c\u8fdb\u5236\u6587\u4ef6 \u5728 Web \u5f00\u53d1\u4e2d\uff0c\u5f53\u6211\u4eec\u5904\u7406\u6587\u4ef6\u65f6\uff08\u521b\u5efa\uff0c\u4e0a\u4f20\uff0c\u4e0b\u8f7d\uff09\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u4e8c\u8fdb\u5236 [&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-698","post","type-post","status-publish","format-standard","hentry","category-front-end"],"_links":{"self":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/698","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=698"}],"version-history":[{"count":1,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/698\/revisions"}],"predecessor-version":[{"id":699,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/698\/revisions\/699"}],"wp:attachment":[{"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=698"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=698"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=698"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}