{"id":691,"date":"2024-06-26T11:15:04","date_gmt":"2024-06-26T03:15:04","guid":{"rendered":"https:\/\/levin.ink\/?p=691"},"modified":"2024-06-26T11:15:04","modified_gmt":"2024-06-26T03:15:04","slug":"js-3-15-%e6%9d%82%e9%a1%b9%e4%ba%8c","status":"publish","type":"post","link":"https:\/\/levin.ink\/?p=691","title":{"rendered":"JS &#8211; 3-15 \u6742\u9879\u4e8c"},"content":{"rendered":"<h1>DOM \u53d8\u52a8\u89c2\u5bdf\u5668 Mutation observer<\/h1>\n<p><code>MutationObserver<\/code>\u00a0\u662f\u4e00\u4e2a\u5185\u5efa\u5bf9\u8c61\uff0c\u5b83\u89c2\u5bdf DOM \u5143\u7d20\uff0c\u5e76\u5728\u68c0\u6d4b\u5230\u66f4\u6539\u65f6\u89e6\u53d1\u56de\u8c03\u3002<br \/>\n\u6211\u4eec\u5c06\u9996\u5148\u770b\u4e00\u4e0b\u8bed\u6cd5\uff0c\u7136\u540e\u63a2\u7a76\u4e00\u4e2a\u5b9e\u9645\u7684\u7528\u4f8b\uff0c\u4ee5\u4e86\u89e3\u5b83\u5728\u4ec0\u4e48\u5730\u65b9\u6709\u7528\u3002<\/p>\n<h2>\u8bed\u6cd5<\/h2>\n<p><code>MutationObserver<\/code>\u00a0\u4f7f\u7528\u7b80\u5355\u3002<br \/>\n\u9996\u5148\uff0c\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u5e26\u6709\u56de\u8c03\u51fd\u6570\u7684\u89c2\u5bdf\u5668\uff1a<\/p>\n<pre><code class=\"language-js\">let observer = new MutationObserver(callback);\n<\/code><\/pre>\n<p>\u7136\u540e\u5c06\u5176\u9644\u52a0\u5230\u4e00\u4e2a DOM \u8282\u70b9\uff1a<\/p>\n<pre><code class=\"language-js\">observer.observe(node, config);\n<\/code><\/pre>\n<p><code>config<\/code>\u00a0\u662f\u4e00\u4e2a\u5177\u6709\u5e03\u5c14\u9009\u9879\u7684\u5bf9\u8c61\uff0c\u8be5\u5e03\u5c14\u9009\u9879\u8868\u793a\u201c\u5c06\u5bf9\u54ea\u4e9b\u66f4\u6539\u505a\u51fa\u53cd\u5e94\u201d\uff1a<\/p>\n<ul>\n<li><code>childList<\/code>\u00a0\u2014\u2014\u00a0<code>node<\/code>\u00a0\u7684\u76f4\u63a5\u5b50\u8282\u70b9\u7684\u66f4\u6539\uff0c<\/li>\n<li><code>subtree<\/code>\u00a0\u2014\u2014\u00a0<code>node<\/code>\u00a0\u7684\u6240\u6709\u540e\u4ee3\u7684\u66f4\u6539\uff0c<\/li>\n<li><code>attributes<\/code>\u00a0\u2014\u2014\u00a0<code>node<\/code>\u00a0\u7684\u7279\u6027\uff08attribute\uff09\uff0c<\/li>\n<li><code>attributeFilter<\/code>\u00a0\u2014\u2014 \u7279\u6027\u540d\u79f0\u6570\u7ec4\uff0c\u53ea\u89c2\u5bdf\u9009\u5b9a\u7684\u7279\u6027\u3002<\/li>\n<li><code>characterData<\/code>\u00a0\u2014\u2014 \u662f\u5426\u89c2\u5bdf\u00a0<code>node.data<\/code>\uff08\u6587\u672c\u5185\u5bb9\uff09\uff0c<br \/>\n\u5176\u4ed6\u51e0\u4e2a\u9009\u9879\uff1a<\/li>\n<li><code>attributeOldValue<\/code>\u00a0\u2014\u2014 \u5982\u679c\u4e3a\u00a0<code>true<\/code>\uff0c\u5219\u5c06\u7279\u6027\u7684\u65e7\u503c\u548c\u65b0\u503c\u90fd\u4f20\u9012\u7ed9\u56de\u8c03\uff08\u53c2\u89c1\u4e0b\u6587\uff09\uff0c\u5426\u5219\u53ea\u4f20\u65b0\u503c\uff08\u9700\u8981\u00a0<code>attributes<\/code>\u00a0\u9009\u9879\uff09\uff0c<\/li>\n<li><code>characterDataOldValue<\/code>\u00a0\u2014\u2014 \u5982\u679c\u4e3a\u00a0<code>true<\/code>\uff0c\u5219\u5c06\u00a0<code>node.data<\/code>\u00a0\u7684\u65e7\u503c\u548c\u65b0\u503c\u90fd\u4f20\u9012\u7ed9\u56de\u8c03\uff08\u53c2\u89c1\u4e0b\u6587\uff09\uff0c\u5426\u5219\u53ea\u4f20\u65b0\u503c\uff08\u9700\u8981\u00a0<code>characterData<\/code>\u00a0\u9009\u9879\uff09\u3002<br \/>\n\u7136\u540e\uff0c\u5728\u53d1\u751f\u4efb\u4f55\u66f4\u6539\u540e\uff0c\u5c06\u6267\u884c\u201c\u56de\u8c03\u201d\uff1a\u66f4\u6539\u88ab\u4f5c\u4e3a\u4e00\u4e2a\u00a0<a href=\"https:\/\/dom.spec.whatwg.org\/#mutationrecord\">MutationRecord<\/a>\u00a0\u5bf9\u8c61\u5217\u8868\u4f20\u5165\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c\u800c\u89c2\u5bdf\u5668\u81ea\u8eab\u4f5c\u4e3a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002<br \/>\n<a href=\"https:\/\/dom.spec.whatwg.org\/#mutationrecord\">MutationRecord<\/a>\u00a0\u5bf9\u8c61\u5177\u6709\u4ee5\u4e0b\u5c5e\u6027\uff1a<\/li>\n<li><code>type<\/code>\u00a0\u2014\u2014 \u53d8\u52a8\u7c7b\u578b\uff0c\u4ee5\u4e0b\u7c7b\u578b\u4e4b\u4e00\uff1a\n<ul>\n<li><code>&quot;attributes&quot;<\/code>\uff1a\u7279\u6027\u88ab\u4fee\u6539\u4e86\uff0c<\/li>\n<li><code>&quot;characterData&quot;<\/code>\uff1a\u6570\u636e\u88ab\u4fee\u6539\u4e86\uff0c\u7528\u4e8e\u6587\u672c\u8282\u70b9\uff0c<\/li>\n<li><code>&quot;childList&quot;<\/code>\uff1a\u6dfb\u52a0\/\u5220\u9664\u4e86\u5b50\u5143\u7d20\u3002<\/li>\n<\/ul>\n<\/li>\n<li><code>target<\/code>\u00a0\u2014\u2014 \u66f4\u6539\u53d1\u751f\u5728\u4f55\u5904\uff1a<code>&quot;attributes&quot;<\/code>\u00a0\u6240\u5728\u7684\u5143\u7d20\uff0c\u6216\u00a0<code>&quot;characterData&quot;<\/code>\u00a0\u6240\u5728\u7684\u6587\u672c\u8282\u70b9\uff0c\u6216\u00a0<code>&quot;childList&quot;<\/code>\u00a0\u53d8\u52a8\u6240\u5728\u7684\u5143\u7d20\uff0c<\/li>\n<li><code>addedNodes\/removedNodes<\/code>\u00a0\u2014\u2014 \u6dfb\u52a0\/\u5220\u9664\u7684\u8282\u70b9\uff0c<\/li>\n<li><code>previousSibling\/nextSibling<\/code>\u00a0\u2014\u2014 \u6dfb\u52a0\/\u5220\u9664\u7684\u8282\u70b9\u7684\u4e0a\u4e00\u4e2a\/\u4e0b\u4e00\u4e2a\u5144\u5f1f\u8282\u70b9\uff0c<\/li>\n<li><code>attributeName\/attributeNamespace<\/code>\u00a0\u2014\u2014 \u88ab\u66f4\u6539\u7684\u7279\u6027\u7684\u540d\u79f0\/\u547d\u540d\u7a7a\u95f4\uff08\u7528\u4e8e XML\uff09\uff0c<\/li>\n<li><code>oldValue<\/code>\u00a0\u2014\u2014 \u4e4b\u524d\u7684\u503c\uff0c\u4ec5\u9002\u7528\u4e8e\u7279\u6027\u6216\u6587\u672c\u66f4\u6539\uff0c\u5982\u679c\u8bbe\u7f6e\u4e86\u76f8\u5e94\u9009\u9879\u00a0<code>attributeOldValue<\/code>\/<code>characterDataOldValue<\/code>\u3002<br \/>\n\u4f8b\u5982\uff0c\u8fd9\u91cc\u6709\u4e00\u4e2a\u00a0<code>&lt;div&gt;<\/code>\uff0c\u5b83\u5177\u6709\u00a0<code>contentEditable<\/code>\u00a0\u7279\u6027\u3002\u8be5\u7279\u6027\u4f7f\u6211\u4eec\u53ef\u4ee5\u805a\u7126\u548c\u7f16\u8f91\u5143\u7d20\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-html\">&lt;div contentEditable id=&quot;elem&quot;&gt;Click and &lt;b&gt;edit&lt;\/b&gt;, please&lt;\/div&gt;\n\n&lt;script&gt;\nlet observer = new MutationObserver(mutationRecords =&gt; {\n  console.log(mutationRecords); \/\/ console.log(the changes)\n});\n\n\/\/ \u89c2\u5bdf\u9664\u4e86\u7279\u6027\u4e4b\u5916\u7684\u6240\u6709\u53d8\u52a8\nobserver.observe(elem, {\n  childList: true, \/\/ \u89c2\u5bdf\u76f4\u63a5\u5b50\u8282\u70b9\n  subtree: true, \/\/ \u53ca\u5176\u66f4\u4f4e\u7684\u540e\u4ee3\u8282\u70b9\n  characterDataOldValue: true \/\/ \u5c06\u65e7\u7684\u6570\u636e\u4f20\u9012\u7ed9\u56de\u8c03\n});\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u5728\u6d4f\u89c8\u5668\u4e2d\u8fd0\u884c\u4e0a\u9762\u8fd9\u6bb5\u4ee3\u7801\uff0c\u5e76\u805a\u7126\u5230\u7ed9\u5b9a\u7684\u00a0<code>&lt;div&gt;<\/code>\u00a0\u4e0a\uff0c\u7136\u540e\u66f4\u6539\u00a0<code>&lt;b&gt;edit&lt;\/b&gt;<\/code>\u00a0\u4e2d\u7684\u6587\u672c\uff0c<code>console.log<\/code>\u00a0\u5c06\u663e\u793a\u4e00\u4e2a\u53d8\u52a8\uff1a<\/p>\n<pre><code class=\"language-js\">mutationRecords = [{\n  type: &quot;characterData&quot;,\n  oldValue: &quot;edit&quot;,\n  target: &lt;text node&gt;,\n  \/\/ \u5176\u4ed6\u5c5e\u6027\u4e3a\u7a7a\n}];\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u8fdb\u884c\u66f4\u590d\u6742\u7684\u7f16\u8f91\u64cd\u4f5c\uff0c\u4f8b\u5982\u5220\u9664\u00a0<code>&lt;b&gt;edit&lt;\/b&gt;<\/code>\uff0c\u90a3\u4e48\u53d8\u52a8\u4e8b\u4ef6\u53ef\u80fd\u4f1a\u5305\u542b\u591a\u4e2a\u53d8\u52a8\u8bb0\u5f55\uff1a<\/p>\n<pre><code class=\"language-js\">mutationRecords = [{\n  type: &quot;childList&quot;,\n  target: &lt;div#elem&gt;,\n  removedNodes: [&lt;b&gt;],\n  nextSibling: &lt;text node&gt;,\n  previousSibling: &lt;text node&gt;\n  \/\/ \u5176\u4ed6\u5c5e\u6027\u4e3a\u7a7a\n}, {\n  type: &quot;characterData&quot;\n  target: &lt;text node&gt;\n  \/\/ ...\u53d8\u52a8\u7684\u8be6\u7ec6\u4fe1\u606f\u53d6\u51b3\u4e8e\u6d4f\u89c8\u5668\u5982\u4f55\u5904\u7406\u6b64\u7c7b\u5220\u9664\n  \/\/ \u5b83\u53ef\u80fd\u662f\u5c06\u4e24\u4e2a\u76f8\u90bb\u7684\u6587\u672c\u8282\u70b9 &quot;edit &quot; \u548c &quot;, please&quot; \u5408\u5e76\u6210\u4e00\u4e2a\u8282\u70b9\uff0c\n  \/\/ \u6216\u8005\u53ef\u80fd\u5c06\u5b83\u4eec\u7559\u5728\u5355\u72ec\u7684\u6587\u672c\u8282\u70b9\u4e2d\n}];\n<\/code><\/pre>\n<p>\u56e0\u6b64\uff0c<code>MutationObserver<\/code>\u00a0\u5141\u8bb8\u5bf9 DOM \u5b50\u6811\u4e2d\u7684\u4efb\u4f55\u66f4\u6539\u4f5c\u51fa\u53cd\u5e94\u3002<\/p>\n<h2>\u7528\u4e8e\u96c6\u6210<\/h2>\n<p>\u5728\u4ec0\u4e48\u65f6\u5019\u53ef\u80fd\u6709\u7528\uff1f<br \/>\n\u60f3\u8c61\u4e00\u4e0b\uff0c\u4f60\u9700\u8981\u6dfb\u52a0\u4e00\u4e2a\u7b2c\u4e09\u65b9\u811a\u672c\uff0c\u8be5\u811a\u672c\u4e0d\u4ec5\u5305\u542b\u6709\u7528\u7684\u529f\u80fd\uff0c\u8fd8\u4f1a\u6267\u884c\u4e00\u4e9b\u6211\u4eec\u4e0d\u60f3\u8981\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u663e\u793a\u5e7f\u544a\u00a0<code>&lt;div class=&quot;ads&quot;&gt;Unwanted ads&lt;\/div&gt;<\/code>\u3002<br \/>\n\u5f53\u7136\uff0c\u7b2c\u4e09\u65b9\u811a\u672c\u6ca1\u6709\u63d0\u4f9b\u5220\u9664\u5b83\u7684\u673a\u5236\u3002<br \/>\n\u4f7f\u7528\u00a0<code>MutationObserver<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u76d1\u6d4b\u5230\u6211\u4eec\u4e0d\u9700\u8981\u7684\u5143\u7d20\u4f55\u65f6\u51fa\u73b0\u5728\u6211\u4eec\u7684 DOM \u4e2d\uff0c\u5e76\u5c06\u5176\u5220\u9664\u3002<br \/>\n\u8fd8\u6709\u4e00\u4e9b\u5176\u4ed6\u60c5\u51b5\uff0c\u4f8b\u5982\u7b2c\u4e09\u65b9\u811a\u672c\u4f1a\u5c06\u67d0\u4e9b\u5185\u5bb9\u6dfb\u52a0\u5230\u6211\u4eec\u7684\u6587\u6863\u4e2d\uff0c\u5e76\u4e14\u6211\u4eec\u5e0c\u671b\u68c0\u6d4b\u51fa\u8fd9\u79cd\u60c5\u51b5\u4f55\u65f6\u53d1\u751f\uff0c\u4ee5\u8c03\u6574\u9875\u9762\uff0c\u52a8\u6001\u8c03\u6574\u67d0\u4e9b\u5185\u5bb9\u7684\u5927\u5c0f\u7b49\u3002<br \/>\n<code>MutationObserver<\/code>\u00a0\u4f7f\u6211\u4eec\u80fd\u591f\u5b9e\u73b0\u8fd9\u79cd\u9700\u6c42\u3002<\/p>\n<h2>\u7528\u4e8e\u67b6\u6784<\/h2>\n<p>\u4ece\u67b6\u6784\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c<code>MutationObserver<\/code>\u00a0\u6709\u4e0d\u9519\u7684\u4f5c\u7528\u3002<br \/>\n\u5047\u8bbe\u6211\u4eec\u6b63\u5728\u5efa\u7acb\u4e00\u4e2a\u6709\u5173\u7f16\u7a0b\u7684\u7f51\u7ad9\u3002\u81ea\u7136\u5730\uff0c\u6587\u7ae0\u548c\u5176\u4ed6\u6750\u6599\u4e2d\u53ef\u80fd\u5305\u542b\u6e90\u4ee3\u7801\u6bb5\u3002<br \/>\n\u5728 HTML \u6807\u8bb0\uff08markup\uff09\u4e2d\u7684\u6b64\u7c7b\u7247\u6bb5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre><code class=\"language-html\">...\n&lt;pre class=&quot;language-javascript&quot;&gt;&lt;code&gt;\n  \/\/ \u8fd9\u91cc\u662f\u4ee3\u7801\n  let hello = &quot;world&quot;;\n&lt;\/code&gt;&lt;\/pre&gt;\n...\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u63d0\u9ad8\u53ef\u8bfb\u6027\uff0c\u540c\u65f6\u5bf9\u5176\u8fdb\u884c\u7f8e\u5316\uff0c\u6211\u4eec\u5c06\u5728\u6211\u4eec\u7684\u7f51\u7ad9\u4e0a\u4f7f\u7528 JavaScript \u8bed\u6cd5\u9ad8\u4eae\u663e\u793a\u5e93\uff0c\u4f8b\u5982\u00a0<a href=\"https:\/\/prismjs.com\/\">Prism.js<\/a>\u3002\u4e3a\u4e86\u4f7f\u7528 Prism \u5bf9\u4ee5\u4e0a\u4ee3\u7801\u7247\u6bb5\u8fdb\u884c\u8bed\u6cd5\u9ad8\u4eae\u663e\u793a\uff0c\u6211\u4eec\u8c03\u7528\u4e86\u00a0<code>Prism.highlightElem(pre)<\/code>\uff0c\u5b83\u4f1a\u68c0\u67e5\u6b64\u7c7b\u00a0<code>pre<\/code>\u00a0\u5143\u7d20\u7684\u5185\u5bb9\uff0c\u5e76\u4e3a\u8fd9\u4e9b\u5143\u7d20\u6dfb\u52a0\u7279\u6b8a\u7684\u6807\u7b7e\uff08tag\uff09\u548c\u6837\u5f0f\uff0c\u4ee5\u8fdb\u884c\u5f69\u8272\u8bed\u6cd5\u9ad8\u4eae\u663e\u793a\uff0c\u7c7b\u4f3c\u4e8e\u4f60\u5728\u672c\u6587\u7684\u793a\u4f8b\u4e2d\u770b\u5230\u7684\u90a3\u6837\u3002<br \/>\n\u90a3\u4e48\uff0c\u6211\u4eec\u5e94\u8be5\u5728\u4ec0\u4e48\u65f6\u5019\u6267\u884c\u8be5\u9ad8\u4eae\u663e\u793a\u65b9\u6cd5\u5462\uff1f\u6211\u4eec\u53ef\u4ee5\u5728\u00a0<code>DOMContentLoaded<\/code>\u00a0\u4e8b\u4ef6\u4e2d\u6267\u884c\uff0c\u6216\u8005\u5c06\u811a\u672c\u653e\u5728\u9875\u9762\u7684\u5e95\u90e8\u3002DOM \u5c31\u7eea\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u641c\u7d22\u5143\u7d20\u00a0<code>pre[class*=&quot;language&quot;]<\/code>\u00a0\u5e76\u5bf9\u5176\u8c03\u7528\u00a0<code>Prism.highlightElem<\/code>\uff1a<\/p>\n<pre><code class=\"language-js\">\/\/ \u9ad8\u4eae\u663e\u793a\u9875\u9762\u4e0a\u7684\u6240\u6709\u4ee3\u7801\u6bb5\ndocument.querySelectorAll('pre[class*=&quot;language&quot;]').forEach(Prism.highlightElem);\n<\/code><\/pre>\n<p>\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u4e00\u5207\u90fd\u5f88\u7b80\u5355\uff0c\u5bf9\u5427\uff1f\u6211\u4eec\u627e\u5230 HTML \u4e2d\u7684\u4ee3\u7801\u7247\u6bb5\u5e76\u9ad8\u4eae\u663e\u793a\u5b83\u4eec\u3002<br \/>\n\u73b0\u5728\u8ba9\u6211\u4eec\u7ee7\u7eed\u3002\u5047\u8bbe\u6211\u4eec\u8981\u4ece\u670d\u52a1\u5668\u52a8\u6001\u83b7\u53d6\u8d44\u6599\u3002\u6211\u4eec\u5c06\u00a0<a href=\"https:\/\/zh.javascript.info\/fetch\">\u5728\u672c\u6559\u7a0b\u7684\u540e\u7eed\u7ae0\u8282<\/a>\u00a0\u4e2d\u5b66\u4e60\u8fdb\u884c\u6b64\u64cd\u4f5c\u7684\u65b9\u6cd5\u3002\u76ee\u524d\uff0c\u53ea\u9700\u8981\u5173\u5fc3\u6211\u4eec\u4ece\u7f51\u7edc\u670d\u52a1\u5668\u83b7\u53d6 HTML \u6587\u7ae0\u5e76\u6309\u9700\u663e\u793a\uff1a<\/p>\n<pre><code class=\"language-js\">let article = \/* \u4ece\u670d\u52a1\u5668\u83b7\u53d6\u65b0\u5185\u5bb9 *\/\narticleElem.innerHTML = article;\n<\/code><\/pre>\n<p>\u65b0\u7684\u00a0<code>article<\/code>\u00a0HTML \u53ef\u80fd\u5305\u542b\u4ee3\u7801\u6bb5\u3002\u6211\u4eec\u9700\u8981\u5bf9\u5176\u8c03\u7528\u00a0<code>Prism.highlightElem<\/code>\uff0c\u5426\u5219\u5b83\u4eec\u5c06\u4e0d\u4f1a\u88ab\u9ad8\u4eae\u663e\u793a\u3002<br \/>\n<strong>\u5bf9\u4e8e\u52a8\u6001\u52a0\u8f7d\u7684\u6587\u7ae0\uff0c\u5e94\u8be5\u5728\u4f55\u5904\u4f55\u65f6\u8c03\u7528\u00a0<code>Prism.highlightElem<\/code>\uff1f<\/strong><br \/>\n\u6211\u4eec\u53ef\u4ee5\u5c06\u8be5\u8c03\u7528\u9644\u52a0\u5230\u52a0\u8f7d\u6587\u7ae0\u7684\u4ee3\u7801\u4e2d\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre><code class=\"language-js\">let article = \/* \u4ece\u670d\u52a1\u5668\u83b7\u53d6\u65b0\u5185\u5bb9 *\/\narticleElem.innerHTML = article;\n\nlet snippets = articleElem.querySelectorAll('pre[class*=&quot;language-&quot;]');\nsnippets.forEach(Prism.highlightElem);\n<\/code><\/pre>\n<p>\u2026\u2026\u4f46\u662f\uff0c\u60f3\u8c61\u4e00\u4e0b\uff0c\u5982\u679c\u4ee3\u7801\u4e2d\u6709\u5f88\u591a\u5730\u65b9\u90fd\u662f\u5728\u52a0\u8f7d\u5185\u5bb9\uff1a\u6587\u7ae0\uff0c\u6d4b\u9a8c\u548c\u8bba\u575b\u5e16\u5b50\u7b49\u3002\u6211\u4eec\u662f\u5426\u9700\u8981\u5728\u6bcf\u4e2a\u5730\u65b9\u90fd\u9644\u52a0\u4e00\u4e2a\u9ad8\u4eae\u663e\u793a\u8c03\u7528\uff0c\u4ee5\u5728\u5185\u5bb9\u52a0\u8f7d\u5b8c\u6210\u540e\uff0c\u9ad8\u4eae\u5185\u5bb9\u4e2d\u7684\u4ee3\u7801\u3002\u90a3\u5f88\u4e0d\u65b9\u4fbf\u3002<br \/>\n\u5e76\u4e14\uff0c\u5982\u679c\u5185\u5bb9\u662f\u7531\u7b2c\u4e09\u65b9\u6a21\u5757\u52a0\u8f7d\u7684\uff0c\u8be5\u600e\u4e48\u529e\uff1f\u4f8b\u5982\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u7531\u5176\u4ed6\u4eba\u7f16\u5199\u7684\u8bba\u575b\uff0c\u8be5\u8bba\u575b\u53ef\u4ee5\u52a8\u6001\u52a0\u8f7d\u5185\u5bb9\uff0c\u5e76\u4e14\u6211\u4eec\u60f3\u4e3a\u5176\u6dfb\u52a0\u8bed\u6cd5\u9ad8\u4eae\u663e\u793a\u3002\u6ca1\u6709\u4eba\u559c\u6b22\u4fee\u8865\u7b2c\u4e09\u65b9\u811a\u672c\u3002<br \/>\n\u5e78\u8fd0\u7684\u662f\uff0c\u8fd8\u6709\u53e6\u4e00\u79cd\u9009\u62e9\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>MutationObserver<\/code>\u00a0\u6765\u81ea\u52a8\u68c0\u6d4b\u4f55\u65f6\u5728\u9875\u9762\u4e2d\u63d2\u5165\u4e86\u4ee3\u7801\u6bb5\uff0c\u5e76\u9ad8\u4eae\u663e\u793a\u5b83\u4eec\u3002<br \/>\n\u56e0\u6b64\uff0c\u6211\u4eec\u5728\u4e00\u4e2a\u5730\u65b9\u5904\u7406\u9ad8\u4eae\u663e\u793a\u529f\u80fd\uff0c\u4ece\u800c\u4f7f\u6211\u4eec\u65e0\u9700\u96c6\u6210\u5b83\u3002<\/p>\n<h3>\u52a8\u6001\u9ad8\u4eae\u663e\u793a\u793a\u4f8b<\/h3>\n<p>\u8fd9\u662f\u4e00\u4e2a\u5de5\u4f5c\u793a\u4f8b\u3002<br \/>\n\u5982\u679c\u4f60\u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\uff0c\u5b83\u5c06\u5f00\u59cb\u89c2\u5bdf\u4e0b\u9762\u7684\u5143\u7d20\uff0c\u5e76\u9ad8\u4eae\u663e\u793a\u73b0\u5728\u6b64\u5904\u7684\u6240\u6709\u4ee3\u7801\u6bb5\uff1a<\/p>\n<pre><code class=\"language-js\">let observer = new MutationObserver(mutations =&gt; {\n\n  for(let mutation of mutations) {\n    \/\/ \u68c0\u67e5\u65b0\u8282\u70b9\uff0c\u6709\u4ec0\u4e48\u9700\u8981\u9ad8\u4eae\u663e\u793a\u7684\u5417\uff1f\n\n    for(let node of mutation.addedNodes) {\n      \/\/ \u6211\u4eec\u53ea\u8ddf\u8e2a\u5143\u7d20\uff0c\u8df3\u8fc7\u5176\u4ed6\u8282\u70b9\uff08\u4f8b\u5982\u6587\u672c\u8282\u70b9\uff09\n      if (!(node instanceof HTMLElement)) continue;\n\n      \/\/ \u68c0\u67e5\u63d2\u5165\u7684\u5143\u7d20\u662f\u5426\u4e3a\u4ee3\u7801\u6bb5\n      if (node.matches('pre[class*=&quot;language-&quot;]')) {\n        Prism.highlightElement(node);\n      }\n\n      \/\/ \u6216\u8005\u53ef\u80fd\u5728\u5b50\u6811\u7684\u67d0\u4e2a\u5730\u65b9\u6709\u4e00\u4e2a\u4ee3\u7801\u6bb5\uff1f\n      for(let elem of node.querySelectorAll('pre[class*=&quot;language-&quot;]')) {\n        Prism.highlightElement(elem);\n      }\n    }\n  }\n\n});\n\nlet demoElem = document.getElementById('highlight-demo');\n\nobserver.observe(demoElem, {childList: true, subtree: true});\n<\/code><\/pre>\n<p>\u7528\u6cd5\uff1a<\/p>\n<pre><code class=\"language-js\">let demoElem = document.getElementById('highlight-demo');\n\n\/\/ \u52a8\u6001\u63d2\u5165\u5e26\u6709\u4ee3\u7801\u6bb5\u7684\u5185\u5bb9\ndemoElem.innerHTML = `\u4e0b\u9762\u662f\u4e00\u4e2a\u4ee3\u7801\u6bb5\uff1a\n  &lt;pre class=&quot;language-javascript&quot;&gt;&lt;code&gt; let hello = &quot;world!&quot;; &lt;\/code&gt;&lt;\/pre&gt;\n  &lt;div&gt;\u53e6\u4e00\u4e2a\u4ee3\u7801\u6bb5\uff1a&lt;\/div&gt;\n  &lt;div&gt;\n    &lt;pre class=&quot;language-css&quot;&gt;&lt;code&gt;.class { margin: 5px; } &lt;\/code&gt;&lt;\/pre&gt;\n  &lt;\/div&gt;\n`;\n<\/code><\/pre>\n<p>\u73b0\u5728\u6211\u4eec\u6709\u4e86\u00a0<code>MutationObserver<\/code>\uff0c\u5b83\u53ef\u4ee5\u8ddf\u8e2a\u89c2\u5bdf\u5230\u7684\u5143\u7d20\u4e2d\u7684\uff0c\u6216\u8005\u6574\u4e2a\u00a0<code>document<\/code>\u00a0\u4e2d\u7684\u6240\u6709\u9ad8\u4eae\u663e\u793a\u3002\u6211\u4eec\u53ef\u4ee5\u5728 HTML \u4e2d\u6dfb\u52a0\/\u5220\u9664\u4ee3\u7801\u6bb5\uff0c\u800c\u65e0\u9700\u8003\u8651\u9ad8\u4eae\u95ee\u9898\u3002<\/p>\n<h2>\u5176\u4ed6\u65b9\u6cd5<\/h2>\n<p>\u6709\u4e00\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u505c\u6b62\u89c2\u5bdf\u8282\u70b9\uff1a<\/p>\n<ul>\n<li><code>observer.disconnect()<\/code>\u00a0\u2014\u2014 \u505c\u6b62\u89c2\u5bdf\u3002<br \/>\n\u5f53\u6211\u4eec\u505c\u6b62\u89c2\u5bdf\u65f6\uff0c\u89c2\u5bdf\u5668\u53ef\u80fd\u5c1a\u672a\u5904\u7406\u67d0\u4e9b\u66f4\u6539\u3002\u5728\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4f7f\u7528\uff1a<\/li>\n<li><code>observer.takeRecords()<\/code>\u00a0\u2014\u2014 \u83b7\u53d6\u5c1a\u672a\u5904\u7406\u7684\u53d8\u52a8\u8bb0\u5f55\u5217\u8868\uff0c\u8868\u4e2d\u8bb0\u5f55\u7684\u662f\u5df2\u7ecf\u53d1\u751f\uff0c\u4f46\u56de\u8c03\u6682\u672a\u5904\u7406\u7684\u53d8\u52a8\u3002<br \/>\n\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u4e00\u8d77\u4f7f\u7528\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-js\">\/\/ \u5982\u679c\u4f60\u5173\u5fc3\u53ef\u80fd\u672a\u5904\u7406\u7684\u8fd1\u671f\u7684\u53d8\u52a8\n\/\/ \u90a3\u4e48\uff0c\u5e94\u8be5\u5728 disconnect \u524d\u8c03\u7528\u83b7\u53d6\u672a\u5904\u7406\u7684\u53d8\u52a8\u5217\u8868\nlet mutationRecords = observer.takeRecords();\n\n\/\/ \u505c\u6b62\u8ddf\u8e2a\u53d8\u52a8\nobserver.disconnect();\n...\n<\/code><\/pre>\n<blockquote>\n<p><code>observer.takeRecords()<\/code>\u00a0\u8fd4\u56de\u7684\u8bb0\u5f55\u88ab\u4ece\u5904\u7406\u961f\u5217\u4e2d\u79fb\u9664<br \/>\n\u56de\u8c03\u51fd\u6570\u4e0d\u4f1a\u88ab\u00a0<code>observer.takeRecords()<\/code>\u00a0\u8fd4\u56de\u7684\u8bb0\u5f55\u8c03\u7528\u3002<\/p>\n<\/blockquote>\n<blockquote>\n<p>\u5783\u573e\u56de\u6536<br \/>\n\u89c2\u5bdf\u5668\u5728\u5185\u90e8\u5bf9\u8282\u70b9\u4f7f\u7528\u5f31\u5f15\u7528\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u4e00\u4e2a\u8282\u70b9\u88ab\u4ece DOM \u4e2d\u79fb\u9664\u4e86\uff0c\u5e76\u4e14\u8be5\u8282\u70b9\u53d8\u5f97\u4e0d\u53ef\u8bbf\u95ee\uff0c\u90a3\u4e48\u5b83\u5c31\u53ef\u4ee5\u88ab\u5783\u573e\u56de\u6536\u3002<br \/>\n\u89c2\u5bdf\u5230 DOM \u8282\u70b9\u8fd9\u4e00\u4e8b\u5b9e\u5e76\u4e0d\u80fd\u963b\u6b62\u5783\u573e\u56de\u6536\u3002<\/p>\n<\/blockquote>\n<h1>\u9009\u62e9 Selection \u548c\u8303\u56f4 Range<\/h1>\n<p>\u5728\u672c\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u6587\u6863\u4e2d\u7684\u9009\u62e9\u4ee5\u53ca\u5728\u8868\u5355\u5b57\u6bb5\uff08\u5982\u00a0<code>&lt;input&gt;<\/code>\uff09\u4e2d\u7684\u9009\u62e9\u3002<br \/>\nJavaScript \u53ef\u4ee5\u8bbf\u95ee\u73b0\u6709\u7684\u9009\u62e9\uff0c\u9009\u62e9\/\u53d6\u6d88\u5168\u90e8\u6216\u90e8\u5206 DOM \u8282\u70b9\u7684\u9009\u62e9\uff0c\u4ece\u6587\u6863\u4e2d\u5220\u9664\u6240\u9009\u90e8\u5206\uff0c\u5c06\u5176\u5305\u88c5\u5230\u4e00\u4e2a\u6807\u7b7e\uff08tag\uff09\u4e2d\uff0c\u7b49\u3002<br \/>\n\u4f60\u53ef\u4ee5\u5728\u672c\u7ae0\u672b\u5c3e\u7684\u201c\u603b\u7ed3\u201d\u90e8\u5206\u627e\u5230\u4e00\u4e9b\u5e38\u89c1\u7684\u4f7f\u7528\u65b9\u5f0f\u3002\u53ef\u80fd\u5c31\u5df2\u7ecf\u6ee1\u8db3\u4e86\u4f60\u5f53\u524d\u7684\u9700\u6c42\uff0c\u4f46\u5982\u679c\u4f60\u9605\u8bfb\u5168\u6587\uff0c\u5c06\u4f1a\u6709\u66f4\u591a\u6536\u83b7\u3002<br \/>\n\u5e95\u5c42\u7684\uff08underlying\uff09<code>Range<\/code>\u00a0\u548c\u00a0<code>Selection<\/code>\u00a0\u5bf9\u8c61\u5f88\u5bb9\u6613\u638c\u63e1\uff0c\u56e0\u6b64\uff0c\u4f60\u4e0d\u9700\u8981\u4efb\u4f55\u8bc0\u7a8d\u4fbf\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u505a\u4f60\u60f3\u8981\u505a\u7684\u4e8b\u513f\u3002<\/p>\n<h2>\u8303\u56f4<\/h2>\n<p>\u9009\u62e9\u7684\u57fa\u672c\u6982\u5ff5\u662f\u00a0<a href=\"https:\/\/dom.spec.whatwg.org\/#ranges\">Range<\/a>\uff1a\u672c\u8d28\u4e0a\u662f\u4e00\u5bf9\u201c\u8fb9\u754c\u70b9\u201d\uff1a\u8303\u56f4\u8d77\u70b9\u548c\u8303\u56f4\u7ec8\u70b9\u3002<br \/>\n\u5728\u6ca1\u6709\u4efb\u4f55\u53c2\u6570\u7684\u60c5\u51b5\u4e0b\uff0c\u521b\u5efa\u4e00\u4e2a\u00a0<code>Range<\/code>\u00a0\u5bf9\u8c61\uff1a<\/p>\n<pre><code class=\"language-js\">let range = new Range();\n<\/code><\/pre>\n<p>\u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>range.setStart(node, offset)<\/code>\u00a0\u548c\u00a0<code>range.setEnd(node, offset)<\/code>\u00a0\u6765\u8bbe\u7f6e\u9009\u62e9\u8fb9\u754c\u3002<br \/>\n\u6b63\u5982\u4f60\u53ef\u80fd\u731c\u5230\u7684\u90a3\u6837\uff0c\u6211\u4eec\u5c06\u8fdb\u4e00\u6b65\u4f7f\u7528\u00a0<code>Range<\/code>\u00a0\u5bf9\u8c61\u8fdb\u884c\u9009\u62e9\uff0c\u4f46\u9996\u5148\u8ba9\u6211\u4eec\u521b\u5efa\u4e00\u4e9b\u8fd9\u6837\u7684\u5bf9\u8c61\u3002<\/p>\n<h3>\u9009\u62e9\u90e8\u5206\u6587\u672c<\/h3>\n<p>\u6709\u8da3\u7684\u662f\uff0c\u8fd9\u4e24\u79cd\u65b9\u6cd5\u4e2d\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u00a0<code>node<\/code>\u00a0\u90fd\u53ef\u4ee5\u662f\u6587\u672c\u8282\u70b9\u6216\u5143\u7d20\u8282\u70b9\uff0c\u800c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7684\u542b\u4e49\u4f9d\u8d56\u4e8e\u6b64\u3002<br \/>\n<strong>\u5982\u679c\u00a0<code>node<\/code>\u00a0\u662f\u4e00\u4e2a\u6587\u672c\u8282\u70b9\uff0c\u90a3\u4e48\u00a0<code>offset<\/code>\u00a0\u5219\u5fc5\u987b\u662f\u5176\u6587\u672c\u4e2d\u7684\u4f4d\u7f6e\u3002<\/strong><br \/>\n\u4f8b\u5982\uff0c\u5bf9\u4e8e\u7ed9\u5b9a\u7684\u00a0<code>&lt;p&gt;Hello&lt;\/p&gt;<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u50cf\u4e0b\u9762\u8fd9\u6837\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u5b57\u6bcd \u201cll\u201d \u7684\u8303\u56f4\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;p id=&quot;p&quot;&gt;Hello&lt;\/p&gt;\n&lt;script&gt;\n  let range = new Range();\n  range.setStart(p.firstChild, 2);\n  range.setEnd(p.firstChild, 4);\n\n  \/\/ \u5bf9 range \u8fdb\u884c toString \u5904\u7406\uff0crange \u5219\u4f1a\u628a\u5176\u5305\u542b\u7684\u5185\u5bb9\u4ee5\u6587\u672c\u7684\u5f62\u5f0f\u8fd4\u56de\n  console.log(range); \/\/ ll\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u83b7\u53d6\u00a0<code>&lt;p&gt;<\/code>\u00a0\u7684\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\uff08\u5373\u6587\u672c\u8282\u70b9\uff09\u5e76\u6307\u5b9a\u5176\u4e2d\u7684\u6587\u672c\u4f4d\u7f6e\uff1a<br \/>\n<img decoding=\"async\" src=\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626101557.png\" alt=\"Pasted image 20240626101557.png\"><\/p>\n<h3>\u9009\u62e9\u5143\u7d20\u8282\u70b9<\/h3>\n<p><strong>\u6216\u8005\uff0c\u5982\u679c\u00a0<code>node<\/code>\u00a0\u662f\u4e00\u4e2a\u5143\u7d20\u8282\u70b9\uff0c\u90a3\u4e48\u00a0<code>offset<\/code>\u00a0\u5219\u5fc5\u987b\u662f\u5b50\u5143\u7d20\u7684\u7f16\u53f7\u3002<\/strong><br \/>\n\u8fd9\u5bf9\u4e8e\u521b\u5efa\u5305\u542b\u6574\u4e2a\u8282\u70b9\u7684\u8303\u56f4\u5f88\u65b9\u4fbf\uff0c\u800c\u4e0d\u662f\u5728\u5176\u6587\u672c\u4e2d\u7684\u67d0\u5904\u505c\u6b62\u3002<br \/>\n\u4f8b\u5982\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u66f4\u590d\u6742\u7684\u6587\u6863\u7247\u6bb5\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;p id=&quot;p&quot;&gt;Example: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;&lt;\/p&gt;\n<\/code><\/pre>\n<p>\u8fd9\u662f\u5b83\u7684 DOM \u7ed3\u6784\uff0c\u5305\u542b\u5143\u7d20\u548c\u6587\u672c\u8282\u70b9\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626101941.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-20240626101941.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20240626101941.png\"><\/div><br \/>\n\u8ba9\u6211\u4eec\u4e3a\u00a0<code>&quot;Example: &lt;i&gt;italic&lt;\/i&gt;&quot;<\/code>\u00a0\u8bbe\u7f6e\u4e00\u4e2a\u8303\u56f4\u3002<br \/>\n\u6b63\u5982\u6211\u4eec\u6240\u770b\u5230\u7684\uff0c\u8fd9\u4e2a\u77ed\u8bed\u6b63\u597d\u7531\u00a0<code>&lt;p&gt;<\/code>\u00a0\u7684\u7d22\u5f15\u4e3a\u00a0<code>0<\/code>\u00a0\u548c\u00a0<code>1<\/code>\u00a0\u7684\u4e24\u4e2a\u5b50\u5143\u7d20\u7ec4\u6210\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626102020.png\" alt=\"Pasted image 20240626102020.png\"><\/p>\n<ul>\n<li>\u8d77\u70b9\u4ee5\u00a0<code>&lt;p&gt;<\/code>\u00a0\u4f5c\u4e3a\u7236\u8282\u70b9\u00a0<code>node<\/code>\uff0c<code>0<\/code>\u00a0\u4f5c\u4e3a\u504f\u79fb\u91cf\u3002<br \/>\n\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u8bbe\u7f6e\u4e3a\u00a0<code>range.setStart(p, 0)<\/code>\u3002<\/li>\n<li>\u7ec8\u70b9\u4e5f\u662f\u4ee5\u00a0<code>&lt;p&gt;<\/code>\u00a0\u4f5c\u4e3a\u7236\u8282\u70b9\u00a0<code>node<\/code>\uff0c\u4f46\u4ee5\u00a0<code>2<\/code>\u00a0\u4f5c\u4e3a\u504f\u79fb\u91cf\uff08\u5b83\u6307\u5b9a\u6700\u5927\u8303\u56f4\uff0c\u4f46\u4e0d\u5305\u62ec\u00a0<code>offset<\/code>\uff09\u3002<br \/>\n\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u8bbe\u7f6e\u4e3a\u00a0<code>range.setEnd(p, 2)<\/code>\u3002<br \/>\n\u793a\u4f8b\u5982\u4e0b\uff0c\u5982\u679c\u4f60\u8fd0\u884c\u5b83\uff0c\u4f60\u53ef\u4ee5\u770b\u5230\u6587\u672c\u88ab\u9009\u4e2d\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-html\">&lt;p id=&quot;p&quot;&gt;Example: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;&lt;\/p&gt;\n\n&lt;script&gt;\n  let range = new Range();\n\n  range.setStart(p, 0);\n  range.setEnd(p, 2);\n\n  \/\/ \u8303\u56f4\u7684 toString \u4ee5\u6587\u672c\u5f62\u5f0f\u8fd4\u56de\u5176\u5185\u5bb9\uff0c\u4e0d\u5e26\u6807\u7b7e\n  console.log(range); \/\/ Example: italic\n\n  \/\/ \u5c06\u6b64\u8303\u56f4\u5e94\u7528\u4e8e\u6587\u6863\u9009\u62e9\uff0c\u540e\u6587\u6709\u89e3\u91ca\n  document.getSelection().addRange(range);\n&lt;\/script&gt;\n<\/code><\/pre>\n<blockquote>\n<p>\u8d77\u59cb\u548c\u7ed3\u675f\u7684\u8282\u70b9\u53ef\u4ee5\u4e0d\u540c<br \/>\n\u6211\u4eec\u4e0d\u662f\u5fc5\u987b\u5728\u00a0<code>setStart<\/code>\u00a0\u548c\u00a0<code>setEnd<\/code>\u00a0\u4e2d\u4f7f\u7528\u76f8\u540c\u7684\u8282\u70b9\u3002\u4e00\u4e2a\u8303\u56f4\u53ef\u80fd\u4f1a\u8de8\u8d8a\u5f88\u591a\u4e0d\u76f8\u5173\u7684\u8282\u70b9\u3002\u552f\u4e00\u8981\u6ce8\u610f\u7684\u662f\u7ec8\u70b9\u8981\u5728\u8d77\u70b9\u4e4b\u540e\u3002<\/p>\n<\/blockquote>\n<h3>\u9009\u62e9\u66f4\u5927\u7684\u7247\u6bb5<\/h3>\n<p>\u8ba9\u6211\u4eec\u5728\u793a\u4f8b\u4e2d\u9009\u62e9\u4e00\u4e2a\u66f4\u5927\u7684\u7247\u6bb5\uff0c\u50cf\u8fd9\u6837\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626102453.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-20240626102453.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20240626102453.png\"><\/div><br \/>\n\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\u5982\u4f55\u5b9e\u73b0\u5b83\u4e86\u3002\u6211\u4eec\u53ea\u9700\u8981\u5c06\u8d77\u70b9\u548c\u7ec8\u70b9\u8bbe\u7f6e\u4e3a\u6587\u672c\u8282\u70b9\u4e2d\u7684\u76f8\u5bf9\u504f\u79fb\u91cf\u5373\u53ef\u3002<br \/>\n\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u8303\u56f4\uff0c\u5b83\uff1a<\/p>\n<ul>\n<li>\u4ece\u00a0<code>&lt;p&gt;<\/code>\u00a0\u7684\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\u7684\u4f4d\u7f6e 2 \u5f00\u59cb\uff08\u9009\u62e9 &quot;Ex<strong>ample:<\/strong>\u00a0&quot; \u4e2d\u9664\u524d\u4e24\u4e2a\u5b57\u6bcd\u5916\u7684\u6240\u6709\u5b57\u6bcd\uff09<\/li>\n<li>\u5230\u00a0<code>&lt;b&gt;<\/code>\u00a0\u7684\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\u7684\u4f4d\u7f6e 3 \u7ed3\u675f\uff08\u9009\u62e9 \u201c<strong>bol<\/strong>d\u201d \u7684\u524d\u4e09\u4e2a\u5b57\u6bcd\uff0c\u5c31\u8fd9\u4e9b\uff09\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-html\">&lt;p id=&quot;p&quot;&gt;Example: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;&lt;\/p&gt;\n\n&lt;script&gt;\n  let range = new Range();\n\n  range.setStart(p.firstChild, 2);\n  range.setEnd(p.querySelector('b').firstChild, 3);\n\n  console.log(range); \/\/ ample: italic and bol\n\n  \/\/ \u4f7f\u7528\u6b64\u8303\u56f4\u8fdb\u884c\u9009\u62e9\uff08\u540e\u6587\u6709\u89e3\u91ca\uff09\n  window.getSelection().addRange(range);\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u6b63\u5982\u4f60\u6240\u770b\u5230\u7684\uff0c\u9009\u62e9\u6211\u4eec\u60f3\u8981\u7684\u8303\u56f4\u5176\u5b9e\u5f88\u5bb9\u6613\u5b9e\u73b0\u3002<br \/>\n\u5982\u679c\u6211\u4eec\u60f3\u5c06\u8282\u70b9\u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5143\u7d20\u4f20\u5165\u00a0<code>setStart\/setEnd<\/code>\u3002\u5426\u5219\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u6587\u672c\u5c42\u7ea7\u4e0a\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<h2>range \u5c5e\u6027<\/h2>\n<p>\u6211\u4eec\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\u521b\u5efa\u7684\u00a0<code>range<\/code>\u00a0\u5bf9\u8c61\u5177\u6709\u4ee5\u4e0b\u5c5e\u6027\uff1a<br \/>\n<img decoding=\"async\" src=\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626102558.png\" alt=\"Pasted image 20240626102558.png\"><\/p>\n<ul>\n<li><code>startContainer<\/code>\uff0c<code>startOffset<\/code>\u00a0\u2014\u2014 \u8d77\u59cb\u8282\u70b9\u548c\u504f\u79fb\u91cf\uff0c\n<ul>\n<li>\u5728\u4e0a\u4f8b\u4e2d\uff1a\u5206\u522b\u662f\u00a0<code>&lt;p&gt;<\/code>\u00a0\u4e2d\u7684\u7b2c\u4e00\u4e2a\u6587\u672c\u8282\u70b9\u548c\u00a0<code>2<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<li><code>endContainer<\/code>\uff0c<code>endOffset<\/code>\u00a0\u2014\u2014 \u7ed3\u675f\u8282\u70b9\u548c\u504f\u79fb\u91cf\uff0c\n<ul>\n<li>\u5728\u4e0a\u4f8b\u4e2d\uff1a\u5206\u522b\u662f\u00a0<code>&lt;b&gt;<\/code>\u00a0\u4e2d\u7684\u7b2c\u4e00\u4e2a\u6587\u672c\u8282\u70b9\u548c\u00a0<code>3<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<li><code>collapsed<\/code>\u00a0\u2014\u2014 \u5e03\u5c14\u503c\uff0c\u5982\u679c\u8303\u56f4\u5728\u540c\u4e00\u70b9\u4e0a\u5f00\u59cb\u548c\u7ed3\u675f\uff08\u6240\u4ee5\u8303\u56f4\u5185\u6ca1\u6709\u5185\u5bb9\uff09\u5219\u4e3a\u00a0<code>true<\/code>\uff0c\n<ul>\n<li>\u5728\u4e0a\u4f8b\u4e2d\uff1a<code>false<\/code><\/li>\n<\/ul>\n<\/li>\n<li><code>commonAncestorContainer<\/code>\u00a0\u2014\u2014 \u5728\u8303\u56f4\u5185\u7684\u6240\u6709\u8282\u70b9\u4e2d\u6700\u8fd1\u7684\u5171\u540c\u7956\u5148\u8282\u70b9\uff0c\n<ul>\n<li>\u5728\u4e0a\u4f8b\u4e2d\uff1a<code>&lt;p&gt;<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u9009\u62e9\u8303\u56f4\u7684\u65b9\u6cd5<\/h2>\n<p>\u6709\u8bb8\u591a\u4fbf\u5229\u7684\u65b9\u6cd5\u53ef\u4ee5\u64cd\u7eb5\u8303\u56f4\u3002<br \/>\n\u6211\u4eec\u5df2\u7ecf\u89c1\u8fc7\u4e86\u00a0<code>setStart<\/code>\u00a0\u548c\u00a0<code>setEnd<\/code>\uff0c\u8fd9\u8fd8\u6709\u5176\u4ed6\u7c7b\u4f3c\u7684\u65b9\u6cd5\u3002<br \/>\n\u8bbe\u7f6e\u8303\u56f4\u7684\u8d77\u70b9\uff1a<\/p>\n<ul>\n<li><code>setStart(node, offset)<\/code>\u00a0\u5c06\u8d77\u70b9\u8bbe\u7f6e\u5728\uff1a<code>node<\/code>\u00a0\u4e2d\u7684\u4f4d\u7f6e\u00a0<code>offset<\/code><\/li>\n<li><code>setStartBefore(node)<\/code>\u00a0\u5c06\u8d77\u70b9\u8bbe\u7f6e\u5728\uff1a<code>node<\/code>\u00a0\u524d\u9762<\/li>\n<li><code>setStartAfter(node)<\/code>\u00a0\u5c06\u8d77\u70b9\u8bbe\u7f6e\u5728\uff1a<code>node<\/code>\u00a0\u540e\u9762<br \/>\n\u8bbe\u7f6e\u8303\u56f4\u7684\u7ec8\u70b9\uff08\u7c7b\u4f3c\u7684\u65b9\u6cd5\uff09\uff1a<\/li>\n<li><code>setEnd(node, offset)<\/code>\u00a0\u5c06\u7ec8\u70b9\u8bbe\u7f6e\u4e3a\uff1a<code>node<\/code>\u00a0\u4e2d\u7684\u4f4d\u7f6e\u00a0<code>offset<\/code><\/li>\n<li><code>setEndBefore(node)<\/code>\u00a0\u5c06\u7ec8\u70b9\u8bbe\u7f6e\u4e3a\uff1a<code>node<\/code>\u00a0\u524d\u9762<\/li>\n<li><code>setEndAfter(node)<\/code>\u00a0\u5c06\u7ec8\u70b9\u8bbe\u7f6e\u4e3a\uff1a<code>node<\/code>\u00a0\u540e\u9762<br \/>\n\u4ece\u6280\u672f\u4e0a\u8bb2\uff0c<code>setStart\/setEnd<\/code>\u00a0\u53ef\u4ee5\u505a\u4efb\u4f55\u4e8b\uff0c\u4f46\u662f\u66f4\u591a\u7684\u65b9\u6cd5\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u4fbf\u6377\u6027\u3002<br \/>\n\u5728\u6240\u6709\u8fd9\u4e9b\u65b9\u6cd5\u4e2d\uff0c<code>node<\/code>\u00a0\u90fd\u53ef\u4ee5\u662f\u6587\u672c\u6216\u8005\u5143\u7d20\u8282\u70b9\uff1a\u5bf9\u4e8e\u6587\u672c\u8282\u70b9\uff0c\u504f\u79fb\u91cf\u00a0<code>offset<\/code>\u00a0\u8de8\u8d8a\u7684\u662f\u5f88\u591a\u5b57\u6bcd\uff0c\u800c\u5bf9\u4e8e\u5143\u7d20\u8282\u70b9\u5219\u8de8\u8d8a\u7684\u662f\u5f88\u591a\u5b50\u8282\u70b9\u3002<br \/>\n\u66f4\u591a\u521b\u5efa\u8303\u56f4\u7684\u65b9\u6cd5\uff1a<\/li>\n<li><code>selectNode(node)<\/code>\u00a0\u8bbe\u7f6e\u8303\u56f4\u4ee5\u9009\u62e9\u6574\u4e2a\u00a0<code>node<\/code><\/li>\n<li><code>selectNodeContents(node)<\/code>\u00a0\u8bbe\u7f6e\u8303\u56f4\u4ee5\u9009\u62e9\u6574\u4e2a\u00a0<code>node<\/code>\u00a0\u7684\u5185\u5bb9<\/li>\n<li><code>collapse(toStart)<\/code>\u00a0\u5982\u679c\u00a0<code>toStart=true<\/code>\u00a0\u5219\u8bbe\u7f6e end=start\uff0c\u5426\u5219\u8bbe\u7f6e start=end\uff0c\u4ece\u800c\u6298\u53e0\u8303\u56f4<\/li>\n<li><code>cloneRange()<\/code>\u00a0\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u76f8\u540c\u8d77\u70b9\/\u7ec8\u70b9\u7684\u65b0\u8303\u56f4<\/li>\n<\/ul>\n<h2>\u7f16\u8f91\u8303\u56f4\u7684\u65b9\u6cd5<\/h2>\n<p>\u521b\u5efa\u8303\u56f4\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u64cd\u4f5c\u5176\u5185\u5bb9\uff1a<\/p>\n<ul>\n<li><code>deleteContents()<\/code>\u00a0\u2014\u2014 \u4ece\u6587\u6863\u4e2d\u5220\u9664\u8303\u56f4\u4e2d\u7684\u5185\u5bb9<\/li>\n<li><code>extractContents()<\/code>\u00a0\u2014\u2014 \u4ece\u6587\u6863\u4e2d\u5220\u9664\u8303\u56f4\u4e2d\u7684\u5185\u5bb9\uff0c\u5e76\u5c06\u5220\u9664\u7684\u5185\u5bb9\u4f5c\u4e3a\u00a0<a href=\"https:\/\/zh.javascript.info\/modifying-document#document-fragment\">DocumentFragment<\/a>\u00a0\u8fd4\u56de<\/li>\n<li><code>cloneContents()<\/code>\u00a0\u2014\u2014 \u590d\u5236\u8303\u56f4\u4e2d\u7684\u5185\u5bb9\uff0c\u5e76\u5c06\u590d\u5236\u7684\u5185\u5bb9\u4f5c\u4e3a\u00a0<a href=\"https:\/\/zh.javascript.info\/modifying-document#document-fragment\">DocumentFragment<\/a>\u00a0\u8fd4\u56de<\/li>\n<li><code>insertNode(node)<\/code>\u00a0\u2014\u2014 \u5728\u8303\u56f4\u7684\u8d77\u59cb\u5904\u5c06\u00a0<code>node<\/code>\u00a0\u63d2\u5165\u6587\u6863<\/li>\n<li><code>surroundContents(node)<\/code>\u00a0\u2014\u2014 \u4f7f\u7528\u00a0<code>node<\/code>\u00a0\u5c06\u6240\u9009\u8303\u56f4\u4e2d\u7684\u5185\u5bb9\u5305\u88f9\u8d77\u6765\u3002\u8981\u4f7f\u6b64\u64cd\u4f5c\u6709\u6548\uff0c\u5219\u8be5\u8303\u56f4\u5fc5\u987b\u5305\u542b\u5176\u4e2d\u6240\u6709\u5143\u7d20\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u6807\u7b7e\uff1a\u4e0d\u80fd\u50cf\u00a0<code>&lt;i&gt;abc<\/code>\u00a0\u8fd9\u6837\u7684\u90e8\u5206\u8303\u56f4\u3002<br \/>\n\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u6211\u4eec\u57fa\u672c\u4e0a\u53ef\u4ee5\u5bf9\u9009\u5b9a\u7684\u8282\u70b9\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-html\">\u70b9\u51fb\u6309\u94ae\u8fd0\u884c\u6240\u9009\u5185\u5bb9\u4e0a\u7684\u65b9\u6cd5\uff0c\u70b9\u51fb &quot;resetExample&quot; \u8fdb\u884c\u91cd\u7f6e\u3002\n\n&lt;p id=&quot;p&quot;&gt;Example: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;&lt;\/p&gt;\n\n&lt;p id=&quot;result&quot;&gt;&lt;\/p&gt;\n&lt;script&gt;\n  let range = new Range();\n\n  \/\/ \u4e0b\u9762\u6f14\u793a\u4e86\u4e0a\u8ff0\u7684\u6bcf\u4e2a\u65b9\u6cd5\uff1a\n  let methods = {\n    deleteContents() {\n      range.deleteContents()\n    },\n    extractContents() {\n      let content = range.extractContents();\n      result.innerHTML = &quot;&quot;;\n      result.append(&quot;extracted: &quot;, content);\n    },\n    cloneContents() {\n      let content = range.cloneContents();\n      result.innerHTML = &quot;&quot;;\n      result.append(&quot;cloned: &quot;, content);\n    },\n    insertNode() {\n      let newNode = document.createElement('u');\n      newNode.innerHTML = &quot;NEW NODE&quot;;\n      range.insertNode(newNode);\n    },\n    surroundContents() {\n      let newNode = document.createElement('u');\n      try {\n        range.surroundContents(newNode);\n      } catch(e) { console.log(e) }\n    },\n    resetExample() {\n      p.innerHTML = `Example: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;`;\n      result.innerHTML = &quot;&quot;;\n\n      range.setStart(p.firstChild, 2);\n      range.setEnd(p.querySelector('b').firstChild, 3);\n\n      window.getSelection().removeAllRanges();\n      window.getSelection().addRange(range);\n    }\n  };\n\n  for(let method in methods) {\n    document.write(`&lt;div&gt;&lt;button onclick=&quot;methods.${method}()&quot;&gt;${method}&lt;\/button&gt;&lt;\/div&gt;`);\n  }\n\n  methods.resetExample();\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u8fd8\u6709\u6bd4\u8f83\u8303\u56f4\u7684\u65b9\u6cd5\uff0c\u4f46\u662f\u5f88\u5c11\u4f7f\u7528\u3002\u5f53\u4f60\u9700\u8981\u5b83\u4eec\u65f6\uff0c\u8bf7\u53c2\u8003\u00a0<a href=\"https:\/\/dom.spec.whatwg.org\/#interface-range\">\u89c4\u8303<\/a>\u00a0\u6216\u00a0<a href=\"https:\/\/developer.mozilla.org\/zh\/docs\/Web\/api\/Range\">MDN \u624b\u518c<\/a>\u3002<\/p>\n<h2>\u9009\u62e9<\/h2>\n<p><code>Range<\/code>\u00a0\u662f\u7528\u4e8e\u7ba1\u7406\u9009\u62e9\u8303\u56f4\u7684\u901a\u7528\u5bf9\u8c61\u3002\u5c3d\u7ba1\u521b\u5efa\u4e00\u4e2a\u00a0<code>Range<\/code>\u00a0\u5e76\u4e0d\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u5728\u5c4f\u5e55\u4e0a\u770b\u5230\u4e00\u4e2a\u5185\u5bb9\u9009\u62e9\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u00a0<code>Range<\/code>\u00a0\u5bf9\u8c61\u5e76\u4f20\u9012\u5b83\u4eec \u2014\u2014 \u4f46\u5b83\u4eec\u5e76\u4e0d\u4f1a\u5728\u89c6\u89c9\u4e0a\u9009\u62e9\u4efb\u4f55\u5185\u5bb9\u3002<br \/>\n\u6587\u6863\u9009\u62e9\u662f\u7531\u00a0<code>Selection<\/code>\u00a0\u5bf9\u8c61\u8868\u793a\u7684\uff0c\u53ef\u901a\u8fc7\u00a0<code>window.getSelection()<\/code>\u00a0\u6216\u00a0<code>document.getSelection()<\/code>\u00a0\u6765\u83b7\u53d6\u3002\u4e00\u4e2a\u9009\u62e9\u53ef\u4ee5\u5305\u62ec\u96f6\u4e2a\u6216\u591a\u4e2a\u8303\u56f4\u3002\u81f3\u5c11\uff0c<a href=\"https:\/\/www.w3.org\/TR\/selection-api\/\">Selection API \u89c4\u8303<\/a>\u00a0\u662f\u8fd9\u4e48\u8bf4\u7684\u3002\u4e0d\u8fc7\u5b9e\u9645\u4e0a\uff0c\u53ea\u6709 Firefox \u5141\u8bb8\u4f7f\u7528\u00a0Ctrl+click\u00a0(Mac \u4e0a\u7528\u00a0Cmd+click) \u5728\u6587\u6863\u4e2d\u9009\u62e9\u591a\u4e2a\u8303\u56f4\u3002<br \/>\n\u5176\u4ed6\u6d4f\u89c8\u5668\u6700\u591a\u652f\u6301 1 \u4e2a\u8303\u56f4\u3002\u6b63\u5982\u6211\u4eec\u5c06\u770b\u5230\u7684\uff0c\u67d0\u4e9b\u00a0<code>Selection<\/code>\u00a0\u65b9\u6cd5\u6697\u793a\u53ef\u80fd\u6709\u591a\u4e2a\u8303\u56f4\uff0c\u4f46\u540c\u6837\uff0c\u5728\u9664 Firefox \u4e4b\u5916\u7684\u6240\u6709\u6d4f\u89c8\u5668\u4e2d\uff0c\u8303\u56f4\u6700\u591a\u662f 1\u3002<\/p>\n<h2>\u9009\u62e9\u5c5e\u6027<\/h2>\n<p>\u5982\u524d\u6240\u8ff0\uff0c\u7406\u8bba\u4e0a\u4e00\u4e2a\u9009\u62e9\u53ef\u80fd\u5305\u542b\u591a\u4e2a\u8303\u56f4\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u8fd9\u4e2a\u65b9\u6cd5\u83b7\u53d6\u8fd9\u4e9b\u8303\u56f4\u5bf9\u8c61\uff1a<\/p>\n<ul>\n<li><code>getRangeAt(i)<\/code>\u00a0\u2014\u2014 \u83b7\u53d6\u7b2c\u00a0<code>i<\/code>\u00a0\u4e2a\u8303\u56f4\uff0c<code>i<\/code>\u00a0\u4ece\u00a0<code>0<\/code>\u00a0\u5f00\u59cb\u3002\u5728\u9664 Firefox \u4e4b\u5916\u7684\u6240\u6709\u6d4f\u89c8\u5668\u4e2d\uff0c\u4ec5\u4f7f\u7528\u00a0<code>0<\/code>\u3002<br \/>\n\u6b64\u5916\uff0c\u8fd8\u6709\u66f4\u65b9\u4fbf\u7684\u5c5e\u6027\u3002<br \/>\n\u4e0e\u8303\u56f4\u7c7b\u4f3c\uff0c\u9009\u62e9\u7684\u8d77\u70b9\u88ab\u79f0\u4e3a\u201c\u951a\u70b9\uff08anchor\uff09\u201d\uff0c\u7ec8\u70b9\u88ab\u79f0\u4e3a\u201c\u7126\u70b9\uff08focus\uff09\u201d\u3002<br \/>\n\u4e3b\u8981\u7684\u9009\u62e9\u5c5e\u6027\u6709\uff1a<\/li>\n<li><code>anchorNode<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u7684\u8d77\u59cb\u8282\u70b9\uff0c<\/li>\n<li><code>anchorOffset<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u5f00\u59cb\u7684\u00a0<code>anchorNode<\/code>\u00a0\u4e2d\u7684\u504f\u79fb\u91cf\uff0c<\/li>\n<li><code>focusNode<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u7684\u7ed3\u675f\u8282\u70b9\uff0c<\/li>\n<li><code>focusOffset<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u5f00\u59cb\u5904\u00a0<code>focusNode<\/code>\u00a0\u7684\u504f\u79fb\u91cf\uff0c<\/li>\n<li><code>isCollapsed<\/code>\u00a0\u2014\u2014 \u5982\u679c\u672a\u9009\u62e9\u4efb\u4f55\u5185\u5bb9\uff08\u7a7a\u8303\u56f4\uff09\u6216\u4e0d\u5b58\u5728\uff0c\u5219\u4e3a\u00a0<code>true<\/code>\u00a0\u3002<\/li>\n<li><code>rangeCount<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u4e2d\u7684\u8303\u56f4\u6570\uff0c\u9664 Firefox \u5916\uff0c\u5176\u4ed6\u6d4f\u89c8\u5668\u6700\u591a\u4e3a\u00a0<code>1<\/code>\u3002<\/li>\n<\/ul>\n<blockquote>\n<p>\u9009\u62e9\u548c\u8303\u56f4\u7684\u8d77\u70b9\u548c\u7ec8\u70b9\u5bf9\u6bd4<br \/>\n\u9009\u62e9\uff08selection\uff09\u7684\u951a\u70b9\/\u7126\u70b9\u548c\u00a0<code>Range<\/code>\u00a0\u7684\u8d77\u70b9\u548c\u7ec8\u70b9\u6709\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u533a\u522b\u3002<br \/>\n\u6b63\u5982\u6211\u4eec\u6240\u77e5\u9053\u7684\uff0c<code>Range<\/code>\u00a0\u5bf9\u8c61\u7684\u8d77\u70b9\u5fc5\u987b\u5728\u5176\u7ec8\u70b9\u4e4b\u524d\u3002<br \/>\n\u4f46\u5bf9\u4e8e\u9009\u62e9\uff0c\u5e76\u4e0d\u603b\u662f\u8fd9\u6837\u7684\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u5728\u4e24\u4e2a\u65b9\u5411\u4e0a\u4f7f\u7528\u9f20\u6807\u8fdb\u884c\u9009\u62e9\uff1a\u201c\u4ece\u5de6\u5230\u53f3\u201d\u6216\u201c\u4ece\u53f3\u5230\u5de6\u201d\u3002<br \/>\n\u6362\u53e5\u8bdd\u8bf4\uff0c\u5f53\u6309\u4e0b\u9f20\u6807\u6309\u952e\uff0c\u7136\u540e\u5b83\u5728\u6587\u6863\u4e2d\u5411\u524d\u79fb\u52a8\u65f6\uff0c\u5b83\u7ed3\u675f\u7684\u4f4d\u7f6e\uff08\u7126\u70b9\uff09\u5c06\u5728\u5b83\u5f00\u59cb\u7684\u4f4d\u7f6e\uff08\u951a\u70b9\uff09\u4e4b\u540e\u3002<br \/>\n\u4f8b\u5982\uff0c\u5982\u679c\u7528\u6237\u4f7f\u7528\u9f20\u6807\u4ece \u201cExample\u201d \u5f00\u59cb\u9009\u62e9\u5230 \u201citalic\u201d\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626105124.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-20240626105124.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20240626105124.png\"><\/div><br \/>\n\u4f46\u662f\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u4ece\u524d\u5411\u540e\u8fdb\u884c\u76f8\u540c\u7684\u9009\u62e9\uff1a\u4ece \u201citalic\u201d \u5230 \u201cExample\u201d\uff08\u4ece\u524d\u5411\u540e\uff09\uff0c\u8fd9\u6837\u5b83\u7ed3\u675f\u7684\u4f4d\u7f6e\uff08\u7126\u70b9\uff09\u5c06\u5728\u5b83\u5f00\u59cb\u7684\u4f4d\u7f6e\uff08\u951a\u70b9\uff09\u4e4b\u524d\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626105147.png\" alt=\"Pasted image 20240626105147.png\"><\/p>\n<\/blockquote>\n<h2>\u9009\u62e9\u4e8b\u4ef6<\/h2>\n<p>\u6709\u4e00\u4e9b\u4e8b\u4ef6\u53ef\u4ee5\u8ddf\u8e2a\u9009\u62e9\uff1a<\/p>\n<ul>\n<li><code>elem.onselectstart<\/code>\u00a0\u2014\u2014 \u5f53\u5728\u5143\u7d20\u00a0<code>elem<\/code>\u00a0\u4e0a\uff08\u6216\u5728\u5176\u5185\u90e8\uff09<strong>\u5f00\u59cb<\/strong>\u9009\u62e9\u65f6\u3002\u4f8b\u5982\uff0c\u5f53\u7528\u6237\u5728\u5143\u7d20\u00a0<code>elem<\/code>\u00a0\u4e0a\u6309\u4e0b\u9f20\u6807\u6309\u952e\u5e76\u5f00\u59cb\u79fb\u52a8\u6307\u9488\u65f6\u3002\n<ul>\n<li>\u963b\u6b62\u9ed8\u8ba4\u884c\u4e3a\u53d6\u6d88\u4e86\u9009\u62e9\u7684\u5f00\u59cb\u3002\u56e0\u6b64\uff0c\u4ece\u8be5\u5143\u7d20\u5f00\u59cb\u9009\u62e9\u53d8\u5f97\u4e0d\u53ef\u80fd\uff0c\u4f46\u8be5\u5143\u7d20\u4ecd\u7136\u662f\u53ef\u9009\u62e9\u7684\u3002\u7528\u6237\u53ea\u9700\u8981\u4ece\u5176\u4ed6\u5730\u65b9\u5f00\u59cb\u9009\u62e9\u3002<\/li>\n<\/ul>\n<\/li>\n<li><code>document.onselectionchange<\/code>\u00a0\u2014\u2014 \u5f53\u9009\u62e9\u53d1\u751f\u53d8\u5316\u6216\u5f00\u59cb\u65f6\u3002\n<ul>\n<li>\u8bf7\u6ce8\u610f\uff1a\u6b64\u5904\u7406\u7a0b\u5e8f\u53ea\u80fd\u5728\u00a0<code>document<\/code>\u00a0\u4e0a\u8bbe\u7f6e\u3002\u5b83\u8ddf\u8e2a\u7684\u662f\u00a0<code>document<\/code>\u00a0\u4e2d\u7684\u6240\u6709\u9009\u62e9\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u9009\u62e9\u8ddf\u8e2a\u6f14\u793a<\/h3>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u5c0f\u4f8b\u5b50\uff0c\u5b83\u8ddf\u8e2a\u4e86\u00a0<code>document<\/code>\u00a0\u4e0a\u5f53\u524d\u7684\u9009\u62e9\uff0c\u5e76\u5c06\u9009\u62e9\u8fb9\u754c\u663e\u793a\u51fa\u6765\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;p id=&quot;p&quot;&gt;Select me: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;&lt;\/p&gt;\n\nFrom &lt;input id=&quot;from&quot; disabled&gt; \u2013 To &lt;input id=&quot;to&quot; disabled&gt;\n&lt;script&gt;\n  document.onselectionchange = function() {\n    let selection = document.getSelection();\n\n    let {anchorNode, anchorOffset, focusNode, focusOffset} = selection;\n\n    \/\/ anchorNode \u548c focusNode \u901a\u5e38\u662f\u6587\u672c\u8282\u70b9\n    from.value = `${anchorNode?.data}, offset ${anchorOffset}`;\n    to.value = `${focusNode?.data}, offset ${focusOffset}`;\n  };\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u590d\u5236\u6240\u9009\u5185\u5bb9\u6709\u4e24\u79cd\u65b9\u5f0f\uff1a<\/p>\n<ol>\n<li>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>document.getSelection().toString()<\/code>\u00a0\u6765\u83b7\u53d6\u5176\u6587\u672c\u5f62\u5f0f\u3002<\/li>\n<li>\u6b64\u5916\uff0c\u60f3\u8981\u590d\u5236\u6574\u4e2a DOM \u8282\u70b9\uff0c\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u9700\u8981\u4fdd\u6301\u5176\u683c\u5f0f\u4e0d\u53d8\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>getRangeAt(...)<\/code>\u00a0\u83b7\u53d6\u5e95\u5c42\u7684\uff08underlying\uff09\u8303\u56f4\u3002<code>Range<\/code>\u00a0\u5bf9\u8c61\u8fd8\u5177\u6709\u00a0<code>cloneContents()<\/code>\u00a0\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u4f1a\u62f7\u8d1d\u8303\u56f4\u4e2d\u7684\u5185\u5bb9\u5e76\u4ee5\u00a0<code>DocumentFragment<\/code>\u00a0\u7684\u5f62\u5f0f\u8fd4\u56de\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u8fd9\u4e2a\u8fd4\u56de\u503c\u63d2\u5165\u5230\u5176\u4ed6\u4f4d\u7f6e\u3002<br \/>\n\u4e0b\u9762\u662f\u5c06\u6240\u9009\u5185\u5bb9\u590d\u5236\u4e3a\u6587\u672c\u548c DOM \u8282\u70b9\u7684\u6f14\u793a\uff1a<\/li>\n<\/ol>\n<pre><code class=\"language-html\">&lt;p id=&quot;p&quot;&gt;Select me: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;&lt;\/p&gt;\n\nCloned: &lt;span id=&quot;cloned&quot;&gt;&lt;\/span&gt;\n&lt;br&gt;\nAs text: &lt;span id=&quot;astext&quot;&gt;&lt;\/span&gt;\n\n&lt;script&gt;\n  document.onselectionchange = function() {\n    let selection = document.getSelection();\n\n    cloned.innerHTML = astext.innerHTML = &quot;&quot;;\n\n    \/\/ \u4ece\u8303\u56f4\u590d\u5236 DOM \u8282\u70b9\uff08\u8fd9\u91cc\u6211\u4eec\u652f\u6301\u591a\u9009\uff09\n    for (let i = 0; i &lt; selection.rangeCount; i++) {\n      cloned.append(selection.getRangeAt(i).cloneContents());\n    }\n\n    \/\/ \u83b7\u53d6\u4e3a\u6587\u672c\u5f62\u5f0f\n    astext.innerHTML += selection;\n  };\n&lt;\/script&gt;\n<\/code><\/pre>\n<h2>\u9009\u62e9\u65b9\u6cd5<\/h2>\n<p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\/\u79fb\u9664\u8303\u56f4\u6765\u5904\u7406\u9009\u62e9\uff1a<\/p>\n<ul>\n<li><code>getRangeAt(i)<\/code>\u00a0\u2014\u2014 \u83b7\u53d6\u4ece\u00a0<code>0<\/code>\u00a0\u5f00\u59cb\u7684\u7b2c i \u4e2a\u8303\u56f4\u3002\u5728\u9664 Firefox \u4e4b\u5916\u7684\u6240\u6709\u6d4f\u89c8\u5668\u4e2d\uff0c\u4ec5\u4f7f\u7528\u00a0<code>0<\/code>\u3002<\/li>\n<li><code>addRange(range)<\/code>\u00a0\u2014\u2014 \u5c06\u00a0<code>range<\/code>\u00a0\u6dfb\u52a0\u5230\u9009\u62e9\u4e2d\u3002\u5982\u679c\u9009\u62e9\u5df2\u6709\u5173\u8054\u7684\u8303\u56f4\uff0c\u5219\u9664 Firefox \u5916\u7684\u6240\u6709\u6d4f\u89c8\u5668\u90fd\u5c06\u5ffd\u7565\u8be5\u8c03\u7528\u3002<\/li>\n<li><code>removeRange(range)<\/code>\u00a0\u2014\u2014 \u4ece\u9009\u62e9\u4e2d\u5220\u9664\u00a0<code>range<\/code>\u3002<\/li>\n<li><code>removeAllRanges()<\/code>\u00a0\u2014\u2014 \u5220\u9664\u6240\u6709\u8303\u56f4\u3002<\/li>\n<li><code>empty()<\/code>\u00a0\u2014\u2014\u00a0<code>removeAllRanges<\/code>\u00a0\u7684\u522b\u540d\u3002<br \/>\n\u8fd8\u6709\u4e00\u4e9b\u65b9\u4fbf\u7684\u65b9\u6cd5\u53ef\u4ee5\u76f4\u63a5\u64cd\u4f5c\u9009\u62e9\u8303\u56f4\uff0c\u800c\u65e0\u9700\u4e2d\u95f4\u7684\u00a0<code>Range<\/code>\u00a0\u8c03\u7528\uff1a<\/li>\n<li><code>collapse(node, offset)<\/code>\u00a0\u2014\u2014 \u7528\u4e00\u4e2a\u65b0\u7684\u8303\u56f4\u66ff\u6362\u9009\u5b9a\u7684\u8303\u56f4\uff0c\u8be5\u65b0\u8303\u56f4\u4ece\u7ed9\u5b9a\u7684\u00a0<code>node<\/code>\u00a0\u5904\u5f00\u59cb\uff0c\u5230\u504f\u79fb\u00a0<code>offset<\/code>\u00a0\u5904\u7ed3\u675f\u3002<\/li>\n<li><code>setPosition(node, offset)<\/code>\u00a0\u2014\u2014\u00a0<code>collapse<\/code>\u00a0\u7684\u522b\u540d\u3002<\/li>\n<li><code>collapseToStart()<\/code>\u00a0\u2014\u2014 \u6298\u53e0\uff08\u66ff\u6362\u4e3a\u7a7a\u8303\u56f4\uff09\u5230\u9009\u62e9\u8d77\u70b9\uff0c<\/li>\n<li><code>collapseToEnd()<\/code>\u00a0\u2014\u2014 \u6298\u53e0\u5230\u9009\u62e9\u7ec8\u70b9\uff0c<\/li>\n<li><code>extend(node, offset)<\/code>\u00a0\u2014\u2014 \u5c06\u9009\u62e9\u7684\u7126\u70b9\uff08focus\uff09\u79fb\u5230\u7ed9\u5b9a\u7684\u00a0<code>node<\/code>\uff0c\u4f4d\u7f6e\u504f\u79fb\u00a0<code>offset<\/code>\uff0c<\/li>\n<li><code>setBaseAndExtent(anchorNode, anchorOffset, focusNode, focusOffset)<\/code>\u00a0\u2014\u2014 \u7528\u7ed9\u5b9a\u7684\u8d77\u70b9\u00a0<code>anchorNode\/anchorOffset<\/code>\u00a0\u548c\u7ec8\u70b9\u00a0<code>focusNode\/focusOffset<\/code>\u00a0\u6765\u66ff\u6362\u9009\u62e9\u8303\u56f4\u3002\u9009\u4e2d\u5b83\u4eec\u4e4b\u95f4\u7684\u6240\u6709\u5185\u5bb9\u3002<\/li>\n<li><code>selectAllChildren(node)<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u00a0<code>node<\/code>\u00a0\u7684\u6240\u6709\u5b50\u8282\u70b9\u3002<\/li>\n<li><code>deleteFromDocument()<\/code>\u00a0\u2014\u2014 \u4ece\u6587\u6863\u4e2d\u5220\u9664\u6240\u9009\u62e9\u7684\u5185\u5bb9\u3002<\/li>\n<li><code>containsNode(node, allowPartialContainment = false)<\/code>\u00a0\u2014\u2014 \u68c0\u67e5\u9009\u62e9\u4e2d\u662f\u5426\u5305\u542b\u00a0<code>node<\/code>\uff08\u82e5\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u00a0<code>true<\/code>\uff0c\u5219\u53ea\u9700\u5305\u542b\u00a0<code>node<\/code>\u00a0\u7684\u90e8\u5206\u5185\u5bb9\u5373\u53ef\uff09<br \/>\n\u5bf9\u4e8e\u5927\u591a\u6570\u9700\u6c42\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u5c31\u591f\u4e86\uff0c\u65e0\u9700\u8bbf\u95ee\u5e95\u5c42\u7684\uff08underlying\uff09<code>Range<\/code>\u00a0\u5bf9\u8c61\u3002<br \/>\n\u4f8b\u5982\uff0c\u9009\u62e9\u6bb5\u843d\u00a0<code>&lt;p&gt;<\/code>\u00a0\u7684\u5168\u90e8\u5185\u5bb9\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-html\">&lt;p id=&quot;p&quot;&gt;Select me: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;&lt;\/p&gt;\n\n&lt;script&gt;\n  \/\/ \u4ece &lt;p&gt; \u7684\u7b2c 0 \u4e2a\u5b50\u8282\u70b9\u9009\u62e9\u5230\u6700\u540e\u4e00\u4e2a\u5b50\u8282\u70b9\n  document.getSelection().setBaseAndExtent(p, 0, p, p.childNodes.length);\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u4f7f\u7528\u8303\u56f4\u6765\u5b8c\u6210\u540c\u4e00\u4e2a\u64cd\u4f5c\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;p id=&quot;p&quot;&gt;Select me: &lt;i&gt;italic&lt;\/i&gt; and &lt;b&gt;bold&lt;\/b&gt;&lt;\/p&gt;\n\n&lt;script&gt;\n  let range = new Range();\n  range.selectNodeContents(p); \/\/ \u6216\u8005\u4e5f\u53ef\u4ee5\u4f7f\u7528 selectNode(p) \u6765\u9009\u62e9 &lt;p&gt; \u6807\u7b7e\n\n  document.getSelection().removeAllRanges(); \/\/ \u6e05\u9664\u73b0\u6709\u9009\u62e9\uff08\u5982\u679c\u6709\u7684\u8bdd\uff09\n  document.getSelection().addRange(range);\n&lt;\/script&gt;\n<\/code><\/pre>\n<blockquote>\n<p>\u5982\u8981\u9009\u62e9\u4e00\u4e9b\u5185\u5bb9\uff0c\u8bf7\u5148\u79fb\u9664\u73b0\u6709\u7684\u9009\u62e9<br \/>\n\u5982\u679c\u5728\u6587\u6863\u4e2d\u5df2\u5b58\u5728\u9009\u62e9\uff0c\u5219\u9996\u5148\u4f7f\u7528\u00a0<code>removeAllRanges()<\/code>\u00a0\u5c06\u5176\u6e05\u7a7a\u3002\u7136\u540e\u6dfb\u52a0\u8303\u56f4\u3002\u5426\u5219\uff0c\u9664 Firefox \u5916\u7684\u6240\u6709\u6d4f\u89c8\u5668\u90fd\u5c06\u5ffd\u7565\u65b0\u8303\u56f4\u3002<br \/>\n\u67d0\u4e9b\u9009\u62e9\u65b9\u6cd5\u4f8b\u5916\uff0c\u5b83\u4eec\u4f1a\u66ff\u6362\u73b0\u6709\u7684\u9009\u62e9\uff0c\u4f8b\u5982\u00a0<code>setBaseAndExtent<\/code>\u3002<\/p>\n<\/blockquote>\n<h2>\u8868\u5355\u63a7\u4ef6\u4e2d\u7684\u9009\u62e9<\/h2>\n<p>\u8bf8\u5982\u00a0<code>input<\/code>\u00a0\u548c\u00a0<code>textarea<\/code>\u00a0\u7b49\u8868\u5355\u5143\u7d20\u63d0\u4f9b\u4e86\u00a0<a href=\"https:\/\/html.spec.whatwg.org\/#textFieldSelection\">\u4e13\u7528\u7684\u9009\u62e9 API<\/a>\uff0c\u6ca1\u6709\u00a0<code>Selection<\/code>\u00a0\u6216\u00a0<code>Range<\/code>\u00a0\u5bf9\u8c61\u3002\u7531\u4e8e\u8f93\u5165\u503c\u662f\u7eaf\u6587\u672c\u800c\u4e0d\u662f HTML\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u6b64\u7c7b\u5bf9\u8c61\uff0c\u4e00\u5207\u90fd\u53d8\u5f97\u66f4\u52a0\u7b80\u5355\u3002<br \/>\n\u5c5e\u6027\uff1a<\/p>\n<ul>\n<li><code>input.selectionStart<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u7684\u8d77\u59cb\u4f4d\u7f6e\uff08\u53ef\u5199\uff09\uff0c<\/li>\n<li><code>input.selectionEnd<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u7684\u7ed3\u675f\u4f4d\u7f6e\uff08\u53ef\u5199\uff09\uff0c<\/li>\n<li><code>input.selectionDirection<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u65b9\u5411\uff0c\u5176\u4e2d\u4e4b\u4e00\uff1a\u201cforward\u201d\uff0c\u201cbackward\u201d \u6216 \u201cnone\u201d\uff08\u4f8b\u5982\u4f7f\u7528\u9f20\u6807\u53cc\u51fb\u8fdb\u884c\u7684\u9009\u62e9\uff09\uff0c<br \/>\n\u4e8b\u4ef6\uff1a<\/li>\n<li><code>input.onselect<\/code>\u00a0\u2014\u2014 \u5f53\u67d0\u4e2a\u4e1c\u897f\u88ab\u9009\u62e9\u65f6\u89e6\u53d1\u3002<br \/>\n\u65b9\u6cd5\uff1a<\/li>\n<li><code>input.select()<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u6587\u672c\u63a7\u4ef6\u4e2d\u7684\u6240\u6709\u5185\u5bb9\uff08\u53ef\u4ee5\u662f\u00a0<code>textarea<\/code>\u00a0\u800c\u4e0d\u662f\u00a0<code>input<\/code>\uff09\uff0c<\/li>\n<li><code>input.setSelectionRange(start, end, [direction])<\/code>\u00a0\u2014\u2014 \u5728\u7ed9\u5b9a\u65b9\u5411\u4e0a\uff08\u53ef\u9009\uff09\uff0c\u4ece\u00a0<code>start<\/code>\u00a0\u4e00\u76f4\u9009\u62e9\u5230\u00a0<code>end<\/code>\u3002<\/li>\n<li><code>input.setRangeText(replacement, [start], [end], [selectionMode])<\/code>\u00a0\u2014\u2014 \u7528\u65b0\u6587\u672c\u66ff\u6362\u8303\u56f4\u4e2d\u7684\u6587\u672c\u3002<br \/>\n\u53ef\u9009\u53c2\u6570\u00a0<code>start<\/code>\u00a0\u548c\u00a0<code>end<\/code>\uff0c\u5982\u679c\u63d0\u4f9b\u7684\u8bdd\uff0c\u5219\u8bbe\u7f6e\u8303\u56f4\u7684\u8d77\u70b9\u548c\u7ec8\u70b9\uff0c\u5426\u5219\u4f7f\u7528\u7528\u6237\u7684\u9009\u62e9\u3002<br \/>\n\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u00a0<code>selectionMode<\/code>\u00a0\u51b3\u5b9a\u66ff\u6362\u6587\u672c\u540e\u5982\u4f55\u8bbe\u7f6e\u9009\u62e9\u3002\u53ef\u80fd\u7684\u503c\u4e3a\uff1a<\/p>\n<ul>\n<li><code>&quot;select&quot;<\/code>\u00a0\u2014\u2014 \u5c06\u9009\u62e9\u65b0\u63d2\u5165\u7684\u6587\u672c\u3002<\/li>\n<li><code>&quot;start&quot;<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u8303\u56f4\u5c06\u5728\u63d2\u5165\u7684\u6587\u672c\u4e4b\u524d\u6298\u53e0\uff08\u5149\u6807\u5c06\u5728\u5176\u4e4b\u524d\uff09\u3002<\/li>\n<li><code>&quot;end&quot;<\/code>\u00a0\u2014\u2014 \u9009\u62e9\u8303\u56f4\u5c06\u5728\u63d2\u5165\u7684\u6587\u672c\u4e4b\u540e\u6298\u53e0\uff08\u5149\u6807\u5c06\u7d27\u968f\u5176\u540e\uff09\u3002<\/li>\n<li><code>&quot;preserve&quot;<\/code>\u00a0\u2014\u2014 \u5c1d\u8bd5\u4fdd\u7559\u9009\u62e9\u3002\u8fd9\u662f\u9ed8\u8ba4\u503c\u3002<br \/>\n\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u770b\u770b\u8fd9\u4e9b\u65b9\u6cd5\u7684\u5b9e\u9645\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u793a\u4f8b \u8ddf\u8e2a\u9009\u62e9<\/h3>\n<p>\u4f8b\u5982\uff0c\u6b64\u6bb5\u4ee3\u7801\u4f7f\u7528\u00a0<code>onselect<\/code>\u00a0\u4e8b\u4ef6\u6765\u8ddf\u8e2a\u9009\u62e9\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;textarea id=&quot;area&quot; style=&quot;width:80%;height:60px&quot;&gt;\nSelecting in this text updates values below.\n&lt;\/textarea&gt;\n&lt;br&gt;\nFrom &lt;input id=&quot;from&quot; disabled&gt; \u2013 To &lt;input id=&quot;to&quot; disabled&gt;\n\n&lt;script&gt;\n  area.onselect = function() {\n    from.value = area.selectionStart;\n    to.value = area.selectionEnd;\n  };\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li><code>onselect<\/code>\u00a0\u662f\u5728\u67d0\u9879\u88ab\u9009\u62e9\u65f6\u89e6\u53d1\uff0c\u800c\u5728\u9009\u62e9\u88ab\u5220\u9664\u65f6\u4e0d\u89e6\u53d1\u3002<\/li>\n<li>\u6839\u636e\u00a0<a href=\"https:\/\/w3c.github.io\/selection-api\/#dfn-selectionchange\">\u89c4\u8303<\/a>\uff0c\u8868\u5355\u63a7\u4ef6\u5185\u7684\u9009\u62e9\u4e0d\u5e94\u8be5\u89e6\u53d1\u00a0<code>document.onselectionchange<\/code>\u00a0\u4e8b\u4ef6\uff0c\u56e0\u4e3a\u5b83\u4e0e\u00a0<code>document<\/code>\u00a0\u9009\u62e9\u548c\u8303\u56f4\u4e0d\u76f8\u5173\u3002\u4e00\u4e9b\u6d4f\u89c8\u5668\u4f1a\u751f\u6210\u5b83\uff0c\u4f46\u6211\u4eec\u4e0d\u5e94\u8be5\u4f9d\u8d56\u5b83\u3002<\/li>\n<\/ul>\n<h3>\u793a\u4f8b \u79fb\u52a8\u5149\u6807<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u66f4\u6539\u00a0<code>selectionStart<\/code>\u00a0\u548c\u00a0<code>selectionEnd<\/code>\uff0c\u4e8c\u8005\u8bbe\u5b9a\u4e86\u9009\u62e9\u3002<br \/>\n\u4e00\u4e2a\u91cd\u8981\u7684\u8fb9\u754c\u60c5\u51b5\u662f\u00a0<code>selectionStart<\/code>\u00a0\u548c\u00a0<code>selectionEnd<\/code>\u00a0\u5f7c\u6b64\u76f8\u7b49\u3002\u90a3\u6b63\u662f\u5149\u6807\u4f4d\u7f6e\u3002\u6216\u8005\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u5f53\u672a\u9009\u62e9\u4efb\u4f55\u5185\u5bb9\u65f6\uff0c\u9009\u62e9\u4f1a\u6298\u53e0\u5728\u5149\u6807\u4f4d\u7f6e\u3002<br \/>\n\u56e0\u6b64\uff0c\u901a\u8fc7\u5c06\u00a0<code>selectionStart<\/code>\u00a0\u548c\u00a0<code>selectionEnd<\/code>\u00a0\u8bbe\u7f6e\u4e3a\u76f8\u540c\u7684\u503c\uff0c\u6211\u4eec\u53ef\u4ee5\u79fb\u52a8\u5149\u6807\u3002<br \/>\n\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;textarea id=&quot;area&quot; style=&quot;width:80%;height:60px&quot;&gt;\nFocus on me, the cursor will be at position 10.\n&lt;\/textarea&gt;\n\n&lt;script&gt;\n  area.onfocus = () =&gt; {\n    \/\/ \u8bbe\u7f6e\u96f6\u5ef6\u8fdf setTimeout \u4ee5\u5728\u6d4f\u89c8\u5668 &quot;focus&quot; \u884c\u4e3a\u5b8c\u6210\u540e\u8fd0\u884c\n    setTimeout(() =&gt; {\n      \/\/ \u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u4efb\u4f55\u9009\u62e9\n      \/\/ \u5982\u679c start=end\uff0c\u5219\u5149\u6807\u5c31\u4f1a\u5728\u8be5\u4f4d\u7f6e\n      area.selectionStart = area.selectionEnd = 10;\n    });\n  };\n&lt;\/script&gt;\n<\/code><\/pre>\n<h3>\u793a\u4f8b \u4fee\u6539\u9009\u62e9<\/h3>\n<p>\u5982\u8981\u4fee\u6539\u9009\u62e9\u7684\u5185\u5bb9\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>input.setRangeText()<\/code>\u00a0\u65b9\u6cd5\u3002\u5f53\u7136\uff0c\u6211\u4eec\u53ef\u4ee5\u8bfb\u53d6\u00a0<code>selectionStart\/End<\/code>\uff0c\u5e76\u5728\u4e86\u89e3\u9009\u62e9\u7684\u60c5\u51b5\u4e0b\u66f4\u6539\u00a0<code>value<\/code>\u00a0\u7684\u76f8\u5e94\u5b50\u5b57\u7b26\u4e32\uff0c\u4f46\u662f\u00a0<code>setRangeText<\/code>\u00a0\u529f\u80fd\u66f4\u5f3a\u5927\uff0c\u901a\u5e38\u66f4\u65b9\u4fbf\u3002<br \/>\n\u90a3\u662f\u4e00\u4e2a\u6709\u70b9\u590d\u6742\u7684\u65b9\u6cd5\u3002\u4f7f\u7528\u5176\u6700\u7b80\u5355\u7684\u5355\u53c2\u6570\u5f62\u5f0f\uff0c\u5b83\u53ef\u4ee5\u66ff\u6362\u7528\u6237\u9009\u62e9\u7684\u8303\u56f4\u5e76\u5220\u9664\u8be5\u9009\u62e9\u3002<br \/>\n\u4f8b\u5982\uff0c\u8fd9\u91cc\u7684\u7528\u6237\u7684\u9009\u62e9\u5c06\u88ab\u5305\u88c5\u5728\u00a0<code>*...*<\/code>\u00a0\u4e2d\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;input id=&quot;input&quot; style=&quot;width:200px&quot; value=&quot;Select here and click the button&quot;&gt;\n&lt;button id=&quot;button&quot;&gt;Wrap selection in stars *...*&lt;\/button&gt;\n\n&lt;script&gt;\nbutton.onclick = () =&gt; {\n  if (input.selectionStart == input.selectionEnd) {\n    return; \/\/ \u4ec0\u4e48\u90fd\u6ca1\u9009\n  }\n\n  let selected = input.value.slice(input.selectionStart, input.selectionEnd);\n  input.setRangeText(`*${selected}*`);\n};\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u4f7f\u7528\u66f4\u591a\u53c2\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u8303\u56f4\u00a0<code>start<\/code>\u00a0\u548c\u00a0<code>end<\/code>\u3002<br \/>\n\u5728\u4e0b\u9762\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5728\u8f93\u5165\u6587\u672c\u4e2d\u627e\u5230\u00a0<code>&quot;THIS&quot;<\/code>\uff0c\u5c06\u5176\u66ff\u6362\uff0c\u5e76\u4fdd\u6301\u66ff\u6362\u6587\u672c\u7684\u9009\u4e2d\u72b6\u6001\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;input id=&quot;input&quot; style=&quot;width:200px&quot; value=&quot;Replace THIS in text&quot;&gt;\n&lt;button id=&quot;button&quot;&gt;Replace THIS&lt;\/button&gt;\n\n&lt;script&gt;\nbutton.onclick = () =&gt; {\n  let pos = input.value.indexOf(&quot;THIS&quot;);\n  if (pos &gt;= 0) {\n    input.setRangeText(&quot;*THIS*&quot;, pos, pos + 4, &quot;select&quot;);\n    input.focus(); \/\/ \u805a\u7126\uff08focus\uff09\uff0c\u4ee5\u4f7f\u9009\u62e9\u53ef\u89c1\n  }\n};\n&lt;\/script&gt;\n<\/code><\/pre>\n<h3>\u793a\u4f8b \u5728\u5149\u6807\u5904\u63d2\u5165<\/h3>\n<p>\u5982\u679c\u672a\u9009\u62e9\u4efb\u4f55\u5185\u5bb9\uff0c\u6216\u8005\u6211\u4eec\u5728\u00a0<code>setRangeText<\/code>\u00a0\u4e2d\u4f7f\u7528\u4e86\u76f8\u540c\u7684\u00a0<code>start<\/code>\u00a0\u548c\u00a0<code>end<\/code>\uff0c\u5219\u4ec5\u63d2\u5165\u65b0\u6587\u672c\uff0c\u4e0d\u4f1a\u5220\u9664\u4efb\u4f55\u5185\u5bb9\u3002<br \/>\n\u6211\u4eec\u4e5f\u53ef\u4ee5\u4f7f\u7528\u00a0<code>setRangeText<\/code>\u00a0\u5728\u201c\u5149\u6807\u5904\u201d\u63d2\u5165\u4e00\u4e9b\u4e1c\u897f\u3002<br \/>\n\u8fd9\u662f\u4e00\u4e2a\u6309\u94ae\uff0c\u6309\u4e0b\u540e\u4f1a\u5728\u5149\u6807\u4f4d\u7f6e\u63d2\u5165\u00a0<code>&quot;HELLO&quot;<\/code>\uff0c\u7136\u540e\u5149\u6807\u7d27\u968f\u5176\u540e\u3002\u5982\u679c\u9009\u62e9\u4e0d\u4e3a\u7a7a\uff0c\u5219\u5c06\u5176\u66ff\u6362\uff08\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6bd4\u8f83\u00a0<code>selectionStart!=selectionEnd<\/code>\u00a0\u6765\u8fdb\u884c\u68c0\u67e5\uff0c\u4e3a\u7a7a\u5219\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\uff09\uff1a<\/p>\n<pre><code class=\"language-js\">&lt;input id=&quot;input&quot; style=&quot;width:200px&quot; value=&quot;Text Text Text Text Text&quot;&gt;\n&lt;button id=&quot;button&quot;&gt;Insert &quot;HELLO&quot; at cursor&lt;\/button&gt;\n\n&lt;script&gt;\n  button.onclick = () =&gt; {\n    input.setRangeText(&quot;HELLO&quot;, input.selectionStart, input.selectionEnd, &quot;end&quot;);\n    input.focus();\n  };\n&lt;\/script&gt;\n<\/code><\/pre>\n<h2>\u4f7f\u4e0d\u53ef\u9009<\/h2>\n<p>\u8981\u4f7f\u67d0\u4e9b\u5185\u5bb9\u4e0d\u53ef\u9009\uff0c\u6709\u4e09\u79cd\u65b9\u5f0f\uff1a<\/p>\n<ol>\n<li>\u4f7f\u7528 CSS \u5c5e\u6027\u00a0<code>user-select: none<\/code>\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-html\">&lt;style&gt;\n#elem {\n  user-select: none;\n}\n&lt;\/style&gt;\n&lt;div&gt;Selectable &lt;div id=&quot;elem&quot;&gt;Unselectable&lt;\/div&gt; Selectable&lt;\/div&gt;\n<\/code><\/pre>\n<p>\u8fd9\u6837\u4e0d\u5141\u8bb8\u9009\u62e9\u4ece\u00a0<code>elem<\/code>\u00a0\u5f00\u59cb\u3002\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u5728\u5176\u4ed6\u5730\u65b9\u5f00\u59cb\u9009\u62e9\uff0c\u5e76\u5c06\u00a0<code>elem<\/code>\u00a0\u5305\u542b\u5728\u5185\u3002<br \/>\n\u7136\u540e\u00a0<code>elem<\/code>\u00a0\u5c06\u6210\u4e3a\u00a0<code>document.getSelection()<\/code>\u00a0\u7684\u4e00\u90e8\u5206\uff0c\u56e0\u6b64\u9009\u62e9\u5b9e\u9645\u53d1\u751f\u4e86\uff0c\u4f46\u662f\u5728\u590d\u5236\u7c98\u8d34\u4e2d\uff0c\u5176\u5185\u5bb9\u901a\u5e38\u4f1a\u88ab\u5ffd\u7565\u3002<br \/>\n2. \u9632\u6b62\u00a0<code>onselectstart<\/code>\u00a0\u6216\u00a0<code>mousedown<\/code>\u00a0\u4e8b\u4ef6\u4e2d\u7684\u9ed8\u8ba4\u884c\u4e3a\u3002<\/p>\n<pre><code class=\"language-html\">&lt;div&gt;Selectable &lt;div id=&quot;elem&quot;&gt;Unselectable&lt;\/div&gt; Selectable&lt;\/div&gt;\n\n&lt;script&gt;\n  elem.onselectstart = () =&gt; false;\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u8fd9\u6837\u53ef\u4ee5\u9632\u6b62\u5728\u00a0<code>elem<\/code>\u00a0\u4e0a\u5f00\u59cb\u9009\u62e9\uff0c\u4f46\u662f\u8bbf\u95ee\u8005\u53ef\u4ee5\u5728\u53e6\u4e00\u4e2a\u5143\u7d20\u4e0a\u5f00\u59cb\u9009\u62e9\uff0c\u7136\u540e\u6269\u5c55\u5230\u00a0<code>elem<\/code>\u3002<br \/>\n\u5f53\u540c\u4e00\u884c\u4e3a\u4e0a\u6709\u53e6\u4e00\u4e2a\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u89e6\u53d1\u9009\u62e9\u65f6\uff08\u4f8b\u5982\u00a0<code>mousedown<\/code>\uff09\uff0c\u8fd9\u4f1a\u5f88\u65b9\u4fbf\u3002\u56e0\u6b64\u6211\u4eec\u7981\u7528\u9009\u62e9\u4ee5\u907f\u514d\u51b2\u7a81\uff0c\u4ecd\u7136\u5141\u8bb8\u590d\u5236\u00a0<code>elem<\/code>\u00a0\u5185\u5bb9\u3002<br \/>\n3. \u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u00a0<code>document.getSelection().empty()<\/code>\u00a0\u6765\u5728\u9009\u62e9\u53d1\u751f\u540e\u6e05\u9664\u9009\u62e9\u3002\u5f88\u5c11\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\uff0c\u56e0\u4e3a\u8fd9\u4f1a\u5728\u9009\u62e9\u9879\u6d88\u5931\u65f6\u5bfc\u81f4\u4e0d\u5fc5\u8981\u7684\u95ea\u70c1\u3002<\/p>\n<h2>MORE<\/h2>\n<ul>\n<li><a href=\"https:\/\/dom.spec.whatwg.org\/#ranges\">DOM \u89c4\u8303\uff1a\u8303\u56f4\uff08Range\uff09<\/a><\/li>\n<li><a href=\"https:\/\/www.w3.org\/TR\/selection-api\/#dom-globaleventhandlers-onselectstart\">\u9009\u62e9\uff08Selection\uff09API<\/a><\/li>\n<li><a href=\"https:\/\/html.spec.whatwg.org\/multipage\/form-control-infrastructure.html#textFieldSelection\">HTML \u89c4\u8303\uff1a\u7528\u4e8e\u6587\u672c\u63a7\u4ef6\u9009\u62e9\u7684 API<\/a><\/li>\n<\/ul>\n<h1>\u4e8b\u4ef6\u5faa\u73af \u5fae\u4efb\u52a1\u4e0e\u5b8f\u4efb\u52a1<\/h1>\n<p>\u6d4f\u89c8\u5668\u4e2d JavaScript \u7684\u6267\u884c\u6d41\u7a0b\u548c Node.js \u4e2d\u7684\u6d41\u7a0b\u90fd\u662f\u57fa\u4e8e\u00a0<strong>\u4e8b\u4ef6\u5faa\u73af<\/strong>\u00a0\u7684\u3002<br \/>\n\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\u7684\u5de5\u4f5c\u65b9\u5f0f\u5bf9\u4e8e\u4ee3\u7801\u4f18\u5316\u5f88\u91cd\u8981\uff0c\u6709\u65f6\u5bf9\u4e8e\u6b63\u786e\u7684\u67b6\u6784\u4e5f\u5f88\u91cd\u8981\u3002<br \/>\n\u5728\u672c\u7ae0\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u4ecb\u7ecd\u4e8b\u4ef6\u5faa\u73af\u5de5\u4f5c\u65b9\u5f0f\u7684\u7406\u8bba\u7ec6\u8282\uff0c\u7136\u540e\u4ecb\u7ecd\u8be5\u77e5\u8bc6\u7684\u5b9e\u9645\u5e94\u7528\u3002<\/p>\n<h2>\u4e8b\u4ef6\u5faa\u73af<\/h2>\n<p><strong>\u4e8b\u4ef6\u5faa\u73af<\/strong>\u00a0\u7684\u6982\u5ff5\u975e\u5e38\u7b80\u5355\u3002\u5b83\u662f\u4e00\u4e2a\u5728 JavaScript \u5f15\u64ce\u7b49\u5f85\u4efb\u52a1\uff0c\u6267\u884c\u4efb\u52a1\u548c\u8fdb\u5165\u4f11\u7720\u72b6\u6001\u7b49\u5f85\u66f4\u591a\u4efb\u52a1\u8fd9\u51e0\u4e2a\u72b6\u6001\u4e4b\u95f4\u8f6c\u6362\u7684\u65e0\u9650\u5faa\u73af\u3002<br \/>\n\u5f15\u64ce\u7684\u4e00\u822c\u7b97\u6cd5\uff1a<\/p>\n<ol>\n<li>\u5f53\u6709\u4efb\u52a1\u65f6\uff1a\n<ul>\n<li>\u4ece\u6700\u5148\u8fdb\u5165\u7684\u4efb\u52a1\u5f00\u59cb\u6267\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u4f11\u7720\u76f4\u5230\u51fa\u73b0\u4efb\u52a1\uff0c\u7136\u540e\u8f6c\u5230\u7b2c 1 \u6b65\u3002<br \/>\n\u5f53\u6211\u4eec\u6d4f\u89c8\u4e00\u4e2a\u7f51\u9875\u65f6\u5c31\u662f\u4e0a\u8ff0\u8fd9\u79cd\u5f62\u5f0f\u3002JavaScript \u5f15\u64ce\u5927\u591a\u6570\u65f6\u5019\u4e0d\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\uff0c\u5b83\u4ec5\u5728\u811a\u672c\/\u5904\u7406\u7a0b\u5e8f\/\u4e8b\u4ef6\u6fc0\u6d3b\u65f6\u6267\u884c\u3002<br \/>\n\u4efb\u52a1\u793a\u4f8b\uff1a<\/li>\n<\/ol>\n<ul>\n<li>\u5f53\u5916\u90e8\u811a\u672c\u00a0<code>&lt;script src=&quot;...&quot;&gt;<\/code>\u00a0\u52a0\u8f7d\u5b8c\u6210\u65f6\uff0c\u4efb\u52a1\u5c31\u662f\u6267\u884c\u5b83\u3002<\/li>\n<li>\u5f53\u7528\u6237\u79fb\u52a8\u9f20\u6807\u65f6\uff0c\u4efb\u52a1\u5c31\u662f\u6d3e\u751f\u51fa\u00a0<code>mousemove<\/code>\u00a0\u4e8b\u4ef6\u548c\u6267\u884c\u5904\u7406\u7a0b\u5e8f\u3002<\/li>\n<li>\u5f53\u5b89\u6392\u7684\uff08scheduled\uff09<code>setTimeout<\/code>\u00a0\u65f6\u95f4\u5230\u8fbe\u65f6\uff0c\u4efb\u52a1\u5c31\u662f\u6267\u884c\u5176\u56de\u8c03\u3002<\/li>\n<li>\u2026\u2026\u8bf8\u5982\u6b64\u7c7b\u3002<br \/>\n\u8bbe\u7f6e\u4efb\u52a1 \u2014\u2014 \u5f15\u64ce\u5904\u7406\u5b83\u4eec \u2014\u2014 \u7136\u540e\u7b49\u5f85\u66f4\u591a\u4efb\u52a1\uff08\u5373\u4f11\u7720\uff0c\u51e0\u4e4e\u4e0d\u6d88\u8017 CPU \u8d44\u6e90\uff09\u3002<br \/>\n\u4e00\u4e2a\u4efb\u52a1\u5230\u6765\u65f6\uff0c\u5f15\u64ce\u53ef\u80fd\u6b63\u5904\u4e8e\u7e41\u5fd9\u72b6\u6001\uff0c\u90a3\u4e48\u8fd9\u4e2a\u4efb\u52a1\u5c31\u4f1a\u88ab\u6392\u5165\u961f\u5217\u3002<br \/>\n\u591a\u4e2a\u4efb\u52a1\u7ec4\u6210\u4e86\u4e00\u4e2a\u961f\u5217\uff0c\u5373\u6240\u8c13\u7684\u201c\u5b8f\u4efb\u52a1\u961f\u5217\u201d\uff08v8 \u672f\u8bed\uff09\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626001511.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-20240626001511.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20240626001511.png\"><\/div><br \/>\n\u4f8b\u5982\uff0c\u5f53\u5f15\u64ce\u6b63\u5728\u5fd9\u4e8e\u6267\u884c\u4e00\u6bb5\u00a0<code>script<\/code>\u00a0\u65f6\uff0c\u7528\u6237\u53ef\u80fd\u4f1a\u79fb\u52a8\u9f20\u6807\u800c\u4ea7\u751f\u00a0<code>mousemove<\/code>\u00a0\u4e8b\u4ef6\uff0c<code>setTimeout<\/code>\u00a0\u6216\u8bb8\u4e5f\u521a\u597d\u5230\u671f\uff0c\u4ee5\u53ca\u5176\u4ed6\u4efb\u52a1\uff0c\u8fd9\u4e9b\u4efb\u52a1\u7ec4\u6210\u4e86\u4e00\u4e2a\u961f\u5217\uff0c\u5982\u4e0a\u56fe\u6240\u793a\u3002<br \/>\n\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u57fa\u4e8e\u201c\u5148\u8fdb\u5148\u51fa\u201d\u7684\u539f\u5219\u6267\u884c\u3002\u5f53\u6d4f\u89c8\u5668\u5f15\u64ce\u6267\u884c\u5b8c\u00a0<code>script<\/code>\u00a0\u540e\uff0c\u5b83\u4f1a\u5904\u7406\u00a0<code>mousemove<\/code>\u00a0\u4e8b\u4ef6\uff0c\u7136\u540e\u5904\u7406\u00a0<code>setTimeout<\/code>\u00a0\u5904\u7406\u7a0b\u5e8f\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002<br \/>\n\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u5f88\u7b80\u5355\uff0c\u5bf9\u5427\uff1f<br \/>\n\u4e24\u4e2a\u7ec6\u8282\uff1a<\/li>\n<\/ul>\n<ol>\n<li>\u5f15\u64ce\u6267\u884c\u4efb\u52a1\u65f6\u6c38\u8fdc\u4e0d\u4f1a\u8fdb\u884c\u6e32\u67d3\uff08render\uff09\u3002\u5982\u679c\u4efb\u52a1\u6267\u884c\u9700\u8981\u5f88\u957f\u4e00\u6bb5\u65f6\u95f4\u4e5f\u6ca1\u5173\u7cfb\u3002\u4ec5\u5728\u4efb\u52a1\u5b8c\u6210\u540e\u624d\u4f1a\u7ed8\u5236\u5bf9 DOM \u7684\u66f4\u6539\u3002<\/li>\n<li>\u5982\u679c\u4e00\u9879\u4efb\u52a1\u6267\u884c\u82b1\u8d39\u7684\u65f6\u95f4\u8fc7\u957f\uff0c\u6d4f\u89c8\u5668\u5c06\u65e0\u6cd5\u6267\u884c\u5176\u4ed6\u4efb\u52a1\uff0c\u4f8b\u5982\u5904\u7406\u7528\u6237\u4e8b\u4ef6\u3002\u56e0\u6b64\uff0c\u5728\u4e00\u5b9a\u65f6\u95f4\u540e\uff0c\u6d4f\u89c8\u5668\u4f1a\u629b\u51fa\u4e00\u4e2a\u5982\u201c\u9875\u9762\u672a\u54cd\u5e94\u201d\u4e4b\u7c7b\u7684\u8b66\u62a5\uff0c\u5efa\u8bae\u4f60\u7ec8\u6b62\u8fd9\u4e2a\u4efb\u52a1\u3002\u8fd9\u79cd\u60c5\u51b5\u5e38\u53d1\u751f\u5728\u6709\u5927\u91cf\u590d\u6742\u7684\u8ba1\u7b97\u6216\u5bfc\u81f4\u6b7b\u5faa\u73af\u7684\u7a0b\u5e8f\u9519\u8bef\u65f6\u3002<br \/>\n\u4ee5\u4e0a\u662f\u7406\u8bba\u77e5\u8bc6\u3002\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u5e94\u7528\u8fd9\u4e9b\u77e5\u8bc6\u3002<\/li>\n<\/ol>\n<h2>\u7528\u4f8b\u4e00\uff1a\u62c6\u5206 CPU \u8fc7\u8f7d\u4efb\u52a1<\/h2>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a CPU \u8fc7\u8f7d\u4efb\u52a1\u3002<br \/>\n\u4f8b\u5982\uff0c\u8bed\u6cd5\u9ad8\u4eae\uff08\u7528\u6765\u7ed9\u672c\u9875\u9762\u4e2d\u7684\u793a\u4f8b\u4ee3\u7801\u7740\u8272\uff09\u662f\u76f8\u5f53\u8017\u8d39 CPU \u8d44\u6e90\u7684\u4efb\u52a1\u3002\u4e3a\u4e86\u9ad8\u4eae\u663e\u793a\u4ee3\u7801\uff0c\u5b83\u6267\u884c\u5206\u6790\uff0c\u521b\u5efa\u5f88\u591a\u7740\u4e86\u8272\u7684\u5143\u7d20\uff0c\u7136\u540e\u5c06\u5b83\u4eec\u6dfb\u52a0\u5230\u6587\u6863\u4e2d \u2014\u2014 \u5bf9\u4e8e\u6587\u672c\u91cf\u5927\u7684\u6587\u6863\u6765\u8bf4\uff0c\u9700\u8981\u8017\u8d39\u5f88\u957f\u65f6\u95f4\u3002<br \/>\n\u5f53\u5f15\u64ce\u5fd9\u4e8e\u8bed\u6cd5\u9ad8\u4eae\u65f6\uff0c\u5b83\u5c31\u65e0\u6cd5\u5904\u7406\u5176\u4ed6 DOM \u76f8\u5173\u7684\u5de5\u4f5c\uff0c\u4f8b\u5982\u5904\u7406\u7528\u6237\u4e8b\u4ef6\u7b49\u3002\u5b83\u751a\u81f3\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6d4f\u89c8\u5668\u201c\u4e2d\u65ad\uff08hiccup\uff09\u201d\u751a\u81f3\u201c\u6302\u8d77\uff08hang\uff09\u201d\u4e00\u6bb5\u65f6\u95f4\uff0c\u8fd9\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5c06\u5927\u4efb\u52a1\u62c6\u5206\u6210\u591a\u4e2a\u5c0f\u4efb\u52a1\u6765\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\u3002\u9ad8\u4eae\u663e\u793a\u524d 100 \u884c\uff0c\u7136\u540e\u4f7f\u7528\u00a0<code>setTimeout<\/code>\uff08\u5ef6\u65f6\u53c2\u6570\u4e3a 0\uff09\u6765\u5b89\u6392\uff08schedule\uff09\u540e 100 \u884c\u7684\u9ad8\u4eae\u663e\u793a\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002<br \/>\n\u4e3a\u4e86\u6f14\u793a\u8fd9\u79cd\u65b9\u6cd5\uff0c\u7b80\u5355\u8d77\u89c1\uff0c\u8ba9\u6211\u4eec\u5199\u4e00\u4e2a\u4ece\u00a0<code>1<\/code>\u00a0\u6570\u5230\u00a0<code>1000000000<\/code>\u00a0\u7684\u51fd\u6570\uff0c\u800c\u4e0d\u5199\u6587\u672c\u9ad8\u4eae\u3002<br \/>\n\u5982\u679c\u4f60\u8fd0\u884c\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\uff0c\u4f60\u4f1a\u770b\u5230\u5f15\u64ce\u4f1a\u201c\u6302\u8d77\u201d\u4e00\u6bb5\u65f6\u95f4\u3002\u5bf9\u4e8e\u670d\u52a1\u7aef JS \u6765\u8bf4\u8fd9\u663e\u800c\u6613\u89c1\uff0c\u5e76\u4e14\u5982\u679c\u4f60\u5728\u6d4f\u89c8\u5668\u4e2d\u8fd0\u884c\u5b83\uff0c\u5c1d\u8bd5\u70b9\u51fb\u9875\u9762\u4e0a\u5176\u4ed6\u6309\u94ae\u65f6\uff0c\u4f60\u4f1a\u53d1\u73b0\u5728\u8ba1\u6570\u7ed3\u675f\u4e4b\u524d\u4e0d\u4f1a\u5904\u7406\u5176\u4ed6\u4e8b\u4ef6\u3002<\/p>\n<pre><code class=\"language-js\">let i = 0;\n\nlet start = Date.now();\n\nfunction count() {\n\n  \/\/ \u505a\u4e00\u4e2a\u7e41\u91cd\u7684\u4efb\u52a1\n  for (let j = 0; j &lt; 1e9; j++) {\n    i++;\n  }\n\n  alert(&quot;Done in &quot; + (Date.now() - start) + 'ms');\n}\n\ncount();\n<\/code><\/pre>\n<p>\u6d4f\u89c8\u5668\u751a\u81f3\u53ef\u80fd\u4f1a\u663e\u793a\u4e00\u4e2a\u201c\u811a\u672c\u6267\u884c\u65f6\u95f4\u8fc7\u957f\u201d\u7684\u8b66\u544a\u3002<br \/>\n\u8ba9\u6211\u4eec\u4f7f\u7528\u5d4c\u5957\u7684\u00a0<code>setTimeout<\/code>\u00a0\u8c03\u7528\u6765\u62c6\u5206\u8fd9\u4e2a\u4efb\u52a1\uff1a<\/p>\n<pre><code class=\"language-js\">let i = 0;\n\nlet start = Date.now();\n\nfunction count() {\n\n  \/\/ \u505a\u7e41\u91cd\u7684\u4efb\u52a1\u7684\u4e00\u90e8\u5206 (*)\n  do {\n    i++;\n  } while (i % 1e6 != 0);\n\n  if (i == 1e9) {\n    alert(&quot;Done in &quot; + (Date.now() - start) + 'ms');\n  } else {\n    setTimeout(count); \/\/ \u5b89\u6392\uff08schedule\uff09\u65b0\u7684\u8c03\u7528 (**)\n  }\n\n}\n\ncount();\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u6d4f\u89c8\u5668\u754c\u9762\u5728\u201c\u8ba1\u6570\u201d\u8fc7\u7a0b\u4e2d\u53ef\u4ee5\u6b63\u5e38\u4f7f\u7528\u3002<br \/>\n\u5355\u6b21\u6267\u884c\u00a0<code>count<\/code>\u00a0\u4f1a\u5b8c\u6210\u5de5\u4f5c\u00a0<code>(*)<\/code>\u00a0\u7684\u4e00\u90e8\u5206\uff0c\u7136\u540e\u6839\u636e\u9700\u8981\u91cd\u65b0\u5b89\u6392\uff08schedule\uff09\u81ea\u8eab\u7684\u6267\u884c\u00a0<code>(**)<\/code>\uff1a<\/p>\n<ol>\n<li>\u9996\u5148\u6267\u884c\u8ba1\u6570\uff1a<code>i=1...1000000<\/code>\u3002<\/li>\n<li>\u7136\u540e\u6267\u884c\u8ba1\u6570\uff1a<code>i=1000001..2000000<\/code>\u3002<\/li>\n<li>\u2026\u2026\u4ee5\u6b64\u7c7b\u63a8\u3002<br \/>\n\u73b0\u5728\uff0c\u5982\u679c\u5728\u5f15\u64ce\u5fd9\u4e8e\u6267\u884c\u7b2c\u4e00\u90e8\u5206\u65f6\u51fa\u73b0\u4e86\u4e00\u4e2a\u65b0\u7684\u526f\u4efb\u52a1\uff08\u4f8b\u5982\u00a0<code>onclick<\/code>\u00a0\u4e8b\u4ef6\uff09\uff0c\u5219\u8be5\u4efb\u52a1\u4f1a\u88ab\u6392\u5165\u961f\u5217\uff0c\u7136\u540e\u5728\u7b2c\u4e00\u90e8\u5206\u6267\u884c\u7ed3\u675f\u65f6\uff0c\u5e76\u5728\u4e0b\u4e00\u90e8\u5206\u5f00\u59cb\u6267\u884c\u524d\uff0c\u4f1a\u6267\u884c\u8be5\u526f\u4efb\u52a1\u3002\u5468\u671f\u6027\u5730\u5728\u4e24\u6b21\u00a0<code>count<\/code>\u00a0\u6267\u884c\u671f\u95f4\u8fd4\u56de\u4e8b\u4ef6\u5faa\u73af\uff0c\u8fd9\u4e3a JavaScript \u5f15\u64ce\u63d0\u4f9b\u4e86\u8db3\u591f\u7684\u201c\u7a7a\u6c14\u201d\u6765\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\uff0c\u4ee5\u54cd\u5e94\u5176\u4ed6\u7684\u7528\u6237\u884c\u4e3a\u3002<br \/>\n\u503c\u5f97\u6ce8\u610f\u7684\u662f\u8fd9\u4e24\u79cd\u53d8\u4f53 \u2014\u2014 \u662f\u5426\u4f7f\u7528\u4e86\u00a0<code>setTimeout<\/code>\u00a0\u5bf9\u4efb\u52a1\u8fdb\u884c\u62c6\u5206 \u2014\u2014 \u5728\u6267\u884c\u901f\u5ea6\u4e0a\u662f\u76f8\u5f53\u7684\u3002\u5728\u6267\u884c\u8ba1\u6570\u7684\u603b\u8017\u65f6\u4e0a\u6ca1\u6709\u591a\u5c11\u5dee\u5f02\u3002<br \/>\n\u4e3a\u4e86\u4f7f\u4e24\u8005\u8017\u65f6\u66f4\u63a5\u8fd1\uff0c\u8ba9\u6211\u4eec\u6765\u505a\u4e00\u4e2a\u6539\u8fdb\u3002<br \/>\n\u6211\u4eec\u5c06\u8981\u628a\u8c03\u5ea6\uff08scheduling\uff09\u79fb\u52a8\u5230\u00a0<code>count()<\/code>\u00a0\u7684\u5f00\u5934\uff1a<\/li>\n<\/ol>\n<pre><code class=\"language-js\">let i = 0;\n\nlet start = Date.now();\n\nfunction count() {\n\n  \/\/ \u5c06\u8c03\u5ea6\uff08scheduling\uff09\u79fb\u52a8\u5230\u5f00\u5934\n  if (i &lt; 1e9 - 1e6) {\n    setTimeout(count); \/\/ \u5b89\u6392\uff08schedule\uff09\u65b0\u7684\u8c03\u7528\n  }\n\n  do {\n    i++;\n  } while (i % 1e6 != 0);\n\n  if (i == 1e9) {\n    alert(&quot;Done in &quot; + (Date.now() - start) + 'ms');\n  }\n\n}\n\ncount();\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u5f53\u6211\u4eec\u5f00\u59cb\u8c03\u7528\u00a0<code>count()<\/code>\u00a0\u65f6\uff0c\u4f1a\u770b\u5230\u6211\u4eec\u9700\u8981\u5bf9\u00a0<code>count()<\/code>\u00a0\u8fdb\u884c\u66f4\u591a\u8c03\u7528\uff0c\u6211\u4eec\u5c31\u4f1a\u5728\u5de5\u4f5c\u524d\u7acb\u5373\u5b89\u6392\uff08schedule\uff09\u5b83\u3002<br \/>\n\u5982\u679c\u4f60\u8fd0\u884c\u5b83\uff0c\u4f60\u5f88\u5bb9\u6613\u6ce8\u610f\u5230\u5b83\u82b1\u8d39\u7684\u65f6\u95f4\u660e\u663e\u51cf\u5c11\u4e86\u3002<br \/>\n\u4e3a\u4ec0\u4e48\uff1f<br \/>\n\u8fd9\u5f88\u7b80\u5355\uff1a\u4f60\u5e94\u8be5\u8fd8\u8bb0\u5f97\uff0c\u591a\u4e2a\u5d4c\u5957\u7684\u00a0<code>setTimeout<\/code>\u00a0\u8c03\u7528\u5728\u6d4f\u89c8\u5668\u4e2d\u7684\u6700\u5c0f\u5ef6\u8fdf\u4e3a 4ms\u3002\u5373\u4f7f\u6211\u4eec\u8bbe\u7f6e\u4e86\u00a0<code>0<\/code>\uff0c\u4f46\u8fd8\u662f\u00a0<code>4ms<\/code>\uff08\u6216\u8005\u66f4\u4e45\u4e00\u4e9b\uff09\u3002\u6240\u4ee5\u6211\u4eec\u5b89\u6392\uff08schedule\uff09\u5f97\u8d8a\u65e9\uff0c\u8fd0\u884c\u901f\u5ea6\u4e5f\u5c31\u8d8a\u5feb\u3002<br \/>\n\u6700\u540e\uff0c\u6211\u4eec\u5c06\u4e00\u4e2a\u7e41\u91cd\u7684\u4efb\u52a1\u62c6\u5206\u6210\u4e86\u51e0\u90e8\u5206\uff0c\u73b0\u5728\u5b83\u4e0d\u4f1a\u963b\u585e\u7528\u6237\u754c\u9762\u4e86\u3002\u800c\u4e14\u5176\u603b\u8017\u65f6\u5e76\u4e0d\u4f1a\u957f\u5f88\u591a\u3002<\/p>\n<h2>\u7528\u4f8b\u4e8c\uff1a\u8fdb\u5ea6\u6307\u793a<\/h2>\n<p>\u5bf9\u6d4f\u89c8\u5668\u811a\u672c\u4e2d\u7684\u8fc7\u8f7d\u578b\u4efb\u52a1\u8fdb\u884c\u62c6\u5206\u7684\u53e6\u4e00\u4e2a\u597d\u5904\u662f\uff0c\u6211\u4eec\u53ef\u4ee5\u663e\u793a\u8fdb\u5ea6\u6307\u793a\u3002<br \/>\n\u6b63\u5982\u524d\u9762\u6240\u63d0\u5230\u7684\uff0c\u4ec5\u5728\u5f53\u524d\u8fd0\u884c\u7684\u4efb\u52a1\u5b8c\u6210\u540e\uff0c\u624d\u4f1a\u5bf9 DOM \u4e2d\u7684\u66f4\u6539\u8fdb\u884c\u7ed8\u5236\uff0c\u65e0\u8bba\u8fd9\u4e2a\u4efb\u52a1\u8fd0\u884c\u82b1\u8d39\u4e86\u591a\u957f\u65f6\u95f4\u3002<br \/>\n\u4ece\u4e00\u65b9\u9762\u8bb2\uff0c\u8fd9\u975e\u5e38\u597d\uff0c\u56e0\u4e3a\u6211\u4eec\u7684\u51fd\u6570\u53ef\u80fd\u4f1a\u521b\u5efa\u5f88\u591a\u5143\u7d20\uff0c\u5c06\u5b83\u4eec\u4e00\u4e2a\u63a5\u4e00\u4e2a\u5730\u63d2\u5165\u5230\u6587\u6863\u4e2d\uff0c\u5e76\u66f4\u6539\u5176\u6837\u5f0f \u2014\u2014 \u8bbf\u95ee\u8005\u4e0d\u4f1a\u770b\u5230\u4efb\u4f55\u672a\u5b8c\u6210\u7684\u201c\u4e2d\u95f4\u6001\u201d\u5185\u5bb9\u3002\u5f88\u91cd\u8981\uff0c\u5bf9\u5427\uff1f<br \/>\n\u8fd9\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u5bf9\u00a0<code>i<\/code>\u00a0\u7684\u66f4\u6539\u5728\u8be5\u51fd\u6570\u5b8c\u6210\u524d\u4e0d\u4f1a\u663e\u793a\u51fa\u6765\uff0c\u6240\u4ee5\u6211\u4eec\u5c06\u53ea\u4f1a\u770b\u5230\u6700\u540e\u7684\u503c\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;div id=&quot;progress&quot;&gt;&lt;\/div&gt;\n\n&lt;script&gt;\n\n  function count() {\n    for (let i = 0; i &lt; 1e6; i++) {\n      i++;\n      progress.innerHTML = i;\n    }\n  }\n\n  count();\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u2026\u2026\u4f46\u662f\u6211\u4eec\u4e5f\u53ef\u80fd\u60f3\u5728\u4efb\u52a1\u6267\u884c\u671f\u95f4\u5c55\u793a\u4e00\u4e9b\u4e1c\u897f\uff0c\u4f8b\u5982\u8fdb\u5ea6\u6761\u3002<br \/>\n\u5982\u679c\u6211\u4eec\u4f7f\u7528\u00a0<code>setTimeout<\/code>\u00a0\u5c06\u7e41\u91cd\u7684\u4efb\u52a1\u62c6\u5206\u6210\u51e0\u90e8\u5206\uff0c\u90a3\u4e48\u53d8\u5316\u5c31\u4f1a\u88ab\u5728\u5b83\u4eec\u4e4b\u95f4\u7ed8\u5236\u51fa\u6765\u3002<br \/>\n\u8fd9\u770b\u8d77\u6765\u66f4\u597d\u770b\uff1a<\/p>\n<pre><code class=\"language-html\">&lt;div id=&quot;progress&quot;&gt;&lt;\/div&gt;\n\n&lt;script&gt;\n  let i = 0;\n\n  function count() {\n\n    \/\/ \u505a\u7e41\u91cd\u7684\u4efb\u52a1\u7684\u4e00\u90e8\u5206 (*)\n    do {\n      i++;\n      progress.innerHTML = i;\n    } while (i % 1e3 != 0);\n\n    if (i &lt; 1e7) {\n      setTimeout(count);\n    }\n\n  }\n\n  count();\n&lt;\/script&gt;\n<\/code><\/pre>\n<p>\u73b0\u5728\u00a0<code>div<\/code>\u00a0\u663e\u793a\u4e86\u00a0<code>i<\/code>\u00a0\u7684\u503c\u7684\u589e\u957f\uff0c\u8fd9\u5c31\u662f\u8fdb\u5ea6\u6761\u7684\u4e00\u79cd\u3002<\/p>\n<h2>\u7528\u4f8b\u4e09\uff1a\u5728\u4e8b\u4ef6\u4e4b\u540e\u505a\u4e00\u4e9b\u4e8b\u60c5<\/h2>\n<p>\u5728\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u51b3\u5b9a\u63a8\u8fdf\u67d0\u4e9b\u884c\u4e3a\uff0c\u76f4\u5230\u4e8b\u4ef6\u5192\u6ce1\u5e76\u5728\u6240\u6709\u7ea7\u522b\u4e0a\u5f97\u5230\u5904\u7406\u540e\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5c06\u8be5\u4ee3\u7801\u5305\u88c5\u5230\u96f6\u5ef6\u8fdf\u7684\u00a0<code>setTimeout<\/code>\u00a0\u4e2d\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002<br \/>\n\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/dispatch-events\">\u521b\u5efa\u81ea\u5b9a\u4e49\u4e8b\u4ef6<\/a>\u00a0\u4e00\u7ae0\u4e2d\uff0c\u6211\u4eec\u770b\u5230\u8fc7\u8fd9\u6837\u4e00\u4e2a\u4f8b\u5b50\uff1a\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u00a0<code>menu-open<\/code>\u00a0\u88ab\u5728\u00a0<code>setTimeout<\/code>\u00a0\u4e2d\u5206\u6d3e\uff08dispatched\uff09\uff0c\u6240\u4ee5\u5b83\u5728\u00a0<code>click<\/code>\u00a0\u4e8b\u4ef6\u88ab\u5904\u7406\u5b8c\u6210\u4e4b\u540e\u53d1\u751f\u3002<\/p>\n<pre><code class=\"language-js\">menu.onclick = function() {\n  \/\/ ...\n\n  \/\/ \u521b\u5efa\u4e00\u4e2a\u5177\u6709\u88ab\u70b9\u51fb\u7684\u83dc\u5355\u9879\u7684\u6570\u636e\u7684\u81ea\u5b9a\u4e49\u4e8b\u4ef6\n  let customEvent = new CustomEvent(&quot;menu-open&quot;, {\n    bubbles: true\n  });\n\n  \/\/ \u5f02\u6b65\u5206\u6d3e\uff08dispatch\uff09\u81ea\u5b9a\u4e49\u4e8b\u4ef6\n  setTimeout(() =&gt; menu.dispatchEvent(customEvent));\n};\n<\/code><\/pre>\n<h2>\u5b8f\u4efb\u52a1\u548c\u5fae\u4efb\u52a1<\/h2>\n<p>\u9664\u4e86\u672c\u7ae0\u4e2d\u6240\u8bb2\u7684\u00a0<strong>\u5b8f\u4efb\u52a1\uff08macrotask\uff09<\/strong>\u00a0\u5916\uff0c\u8fd8\u6709\u5728\u00a0<a href=\"https:\/\/zh.javascript.info\/microtask-queue\">\u5fae\u4efb\u52a1\uff08Microtask\uff09<\/a>\u00a0\u4e00\u7ae0\u4e2d\u63d0\u5230\u7684\u00a0<strong>\u5fae\u4efb\u52a1\uff08microtask\uff09<\/strong>\u3002<br \/>\n\u5fae\u4efb\u52a1\u4ec5\u6765\u81ea\u4e8e\u6211\u4eec\u7684\u4ee3\u7801\u3002\u5b83\u4eec\u901a\u5e38\u662f\u7531 promise \u521b\u5efa\u7684\uff1a\u5bf9\u00a0<code>.then\/catch\/finally<\/code>\u00a0\u5904\u7406\u7a0b\u5e8f\u7684\u6267\u884c\u4f1a\u6210\u4e3a\u5fae\u4efb\u52a1\u3002\u5fae\u4efb\u52a1\u4e5f\u88ab\u7528\u4e8e\u00a0<code>await<\/code>\u00a0\u7684\u201c\u5e55\u540e\u201d\uff0c\u56e0\u4e3a\u5b83\u662f promise \u5904\u7406\u7684\u53e6\u4e00\u79cd\u5f62\u5f0f\u3002<br \/>\n\u8fd8\u6709\u4e00\u4e2a\u7279\u6b8a\u7684\u51fd\u6570\u00a0<code>queueMicrotask(func)<\/code>\uff0c\u5b83\u5bf9\u00a0<code>func<\/code>\u00a0\u8fdb\u884c\u6392\u961f\uff0c\u4ee5\u5728\u5fae\u4efb\u52a1\u961f\u5217\u4e2d\u6267\u884c\u3002<br \/>\n<strong>\u6bcf\u4e2a\u5b8f\u4efb\u52a1\u4e4b\u540e\uff0c\u5f15\u64ce\u4f1a\u7acb\u5373\u6267\u884c\u5fae\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u6240\u6709\u4efb\u52a1\uff0c\u7136\u540e\u518d\u6267\u884c\u5176\u4ed6\u7684\u5b8f\u4efb\u52a1\uff0c\u6216\u6e32\u67d3\uff0c\u6216\u8fdb\u884c\u5176\u4ed6\u4efb\u4f55\u64cd\u4f5c\u3002<\/strong><br \/>\n\u4f8b\u5982\uff0c\u770b\u770b\u4e0b\u9762\u8fd9\u4e2a\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-js\">setTimeout(() =&gt; alert(&quot;timeout&quot;));\n\nPromise.resolve()\n  .then(() =&gt; alert(&quot;promise&quot;));\n\nalert(&quot;code&quot;);\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7684\u6267\u884c\u987a\u5e8f\u662f\u600e\u6837\u7684\uff1f<\/p>\n<ol>\n<li><code>code<\/code>\u00a0\u9996\u5148\u663e\u793a\uff0c\u56e0\u4e3a\u5b83\u662f\u5e38\u89c4\u7684\u540c\u6b65\u8c03\u7528\u3002<\/li>\n<li><code>promise<\/code>\u00a0\u7b2c\u4e8c\u4e2a\u51fa\u73b0\uff0c\u56e0\u4e3a\u00a0<code>then<\/code>\u00a0\u4f1a\u901a\u8fc7\u5fae\u4efb\u52a1\u961f\u5217\uff0c\u5e76\u5728\u5f53\u524d\u4ee3\u7801\u4e4b\u540e\u6267\u884c\u3002<\/li>\n<li><code>timeout<\/code>\u00a0\u6700\u540e\u663e\u793a\uff0c\u56e0\u4e3a\u5b83\u662f\u4e00\u4e2a\u5b8f\u4efb\u52a1\u3002<br \/>\n\u66f4\u8be6\u7ec6\u7684\u4e8b\u4ef6\u5faa\u73af\u56fe\u793a\u5982\u4e0b\uff08\u987a\u5e8f\u662f\u4ece\u4e0a\u5230\u4e0b\uff0c\u5373\uff1a\u9996\u5148\u662f\u811a\u672c\uff0c\u7136\u540e\u662f\u5fae\u4efb\u52a1\uff0c\u6e32\u67d3\u7b49\uff09\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/levin.ink\/wp-content\/uploads\/2024\/06\/Pasted-image-20240626002846.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-20240626002846.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20240626002846.png\"><\/div><br \/>\n\u5fae\u4efb\u52a1\u4f1a\u5728\u6267\u884c\u4efb\u4f55\u5176\u4ed6\u4e8b\u4ef6\u5904\u7406\uff0c\u6216\u6e32\u67d3\uff0c\u6216\u6267\u884c\u4efb\u4f55\u5176\u4ed6\u5b8f\u4efb\u52a1\u4e4b\u524d\u5b8c\u6210\u3002<br \/>\n\u8fd9\u5f88\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u786e\u4fdd\u4e86\u5fae\u4efb\u52a1\u4e4b\u95f4\u7684\u5e94\u7528\u7a0b\u5e8f\u73af\u5883\u57fa\u672c\u76f8\u540c\uff08\u6ca1\u6709\u9f20\u6807\u5750\u6807\u66f4\u6539\uff0c\u6ca1\u6709\u65b0\u7684\u7f51\u7edc\u6570\u636e\u7b49\uff09\u3002<br \/>\n\u5982\u679c\u6211\u4eec\u60f3\u8981\u5f02\u6b65\u6267\u884c\uff08\u5728\u5f53\u524d\u4ee3\u7801\u4e4b\u540e\uff09\u4e00\u4e2a\u51fd\u6570\uff0c\u4f46\u662f\u8981\u5728\u66f4\u6539\u88ab\u6e32\u67d3\u6216\u65b0\u4e8b\u4ef6\u88ab\u5904\u7406\u4e4b\u524d\u6267\u884c\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<code>queueMicrotask<\/code>\u00a0\u6765\u5bf9\u5176\u8fdb\u884c\u5b89\u6392\uff08schedule\uff09\u3002<br \/>\n\u8fd9\u662f\u4e00\u4e2a\u4e0e\u524d\u9762\u90a3\u4e2a\u4f8b\u5b50\u7c7b\u4f3c\u7684\uff0c\u5e26\u6709\u201c\u8ba1\u6570\u8fdb\u5ea6\u6761\u201d\u7684\u793a\u4f8b\uff0c\u4f46\u662f\u5b83\u4f7f\u7528\u4e86\u00a0<code>queueMicrotask<\/code>\u00a0\u800c\u4e0d\u662f\u00a0<code>setTimeout<\/code>\u3002\u4f60\u53ef\u4ee5\u770b\u5230\u5b83\u5728\u6700\u540e\u624d\u6e32\u67d3\u3002\u5c31\u50cf\u5199\u7684\u662f\u540c\u6b65\u4ee3\u7801\u4e00\u6837\uff1a<\/li>\n<\/ol>\n<pre><code class=\"language-html\">&lt;div id=&quot;progress&quot;&gt;&lt;\/div&gt;\n\n&lt;script&gt;\n  let i = 0;\n\n  function count() {\n\n    \/\/ \u505a\u7e41\u91cd\u7684\u4efb\u52a1\u7684\u4e00\u90e8\u5206 (*)\n    do {\n      i++;\n      progress.innerHTML = i;\n    } while (i % 1e3 != 0);\n\n    if (i &lt; 1e6) {\n      queueMicrotask(count);\n    }\n\n  }\n\n  count();\n&lt;\/script&gt;\n<\/code><\/pre>\n<blockquote>\n<p>Web Workers<br \/>\n\u5bf9\u4e8e\u4e0d\u5e94\u8be5\u963b\u585e\u4e8b\u4ef6\u5faa\u73af\u7684\u8017\u65f6\u957f\u7684\u7e41\u91cd\u8ba1\u7b97\u4efb\u52a1\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u00a0<a href=\"https:\/\/html.spec.whatwg.org\/multipage\/workers.html\">Web Workers<\/a>\u3002<br \/>\n\u8fd9\u662f\u5728\u53e6\u4e00\u4e2a\u5e76\u884c\u7ebf\u7a0b\u4e2d\u8fd0\u884c\u4ee3\u7801\u7684\u65b9\u5f0f\u3002<br \/>\nWeb Workers \u53ef\u4ee5\u4e0e\u4e3b\u7ebf\u7a0b\u4ea4\u6362\u6d88\u606f\uff0c\u4f46\u662f\u5b83\u4eec\u5177\u6709\u81ea\u5df1\u7684\u53d8\u91cf\u548c\u4e8b\u4ef6\u5faa\u73af\u3002<br \/>\nWeb Workers \u6ca1\u6709\u8bbf\u95ee DOM \u7684\u6743\u9650\uff0c\u56e0\u6b64\uff0c\u5b83\u4eec\u5bf9\u4e8e\u540c\u65f6\u4f7f\u7528\u591a\u4e2a CPU \u5185\u6838\u7684\u8ba1\u7b97\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>DOM \u53d8\u52a8\u89c2\u5bdf\u5668 Mutation observer MutationObserver\u00a0\u662f\u4e00\u4e2a\u5185\u5efa\u5bf9\u8c61\uff0c\u5b83\u89c2 [&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-691","post","type-post","status-publish","format-standard","hentry","category-front-end"],"_links":{"self":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/691","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=691"}],"version-history":[{"count":1,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/691\/revisions"}],"predecessor-version":[{"id":692,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/691\/revisions\/692"}],"wp:attachment":[{"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}