{"id":4635,"date":"2025-08-02T23:30:08","date_gmt":"2025-08-02T15:30:08","guid":{"rendered":"https:\/\/blog.odjbinail.cn\/?p=4635"},"modified":"2025-08-19T11:41:39","modified_gmt":"2025-08-19T03:41:39","slug":"%e5%89%8d%e7%ab%af%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e6%96%b9%e6%b3%95%ef%bc%88%e4%b8%80%ef%bc%89","status":"publish","type":"post","link":"https:\/\/blog.odjbinail.cn\/?p=4635","title":{"rendered":"\u524d\u7aef\u6027\u80fd\u4f18\u5316\u65b9\u6cd5\uff08\u4e00\uff09"},"content":{"rendered":"<h2>RAIL \u8bc4\u4f30\u6807\u51c6<\/h2>\n<ul>\n<li>\u54cd\u5e94\uff1a\u5904\u7406\u4e8b\u4ef6\u5e94\u5728 50ms \u4ee5\u5185\u5b8c\u6210<\/li>\n<li>\u52a8\u753b\uff1a\u6bcf 10ms \u4ea7\u751f\u4e00\u5e27<\/li>\n<li>\u7a7a\u95f2\uff1a\u5c3d\u53ef\u80fd\u589e\u52a0\u7a7a\u95f2\u65f6\u95f4<\/li>\n<li>\u52a0\u8f7d\uff1a\u5728 5s \u5185\u5b8c\u6210\u5185\u5bb9\u52a0\u8f7d\u5e76\u53ef\u4ee5\u4ea4\u4e92 <\/li>\n<\/ul>\n<h2>\u6027\u80fd\u6d4b\u91cf\u5de5\u5177<\/h2>\n<ul>\n<li>Chrome DevTools \u5f00\u53d1\u8c03\u8bd5\u3001\u6027\u80fd\u8bc4\u6d4b<\/li>\n<li>Lighthouse \u7f51\u7ad9\u6574\u4f53\u8d28\u91cf\u8bc4\u4f30<\/li>\n<li>WebPageTest \u591a\u6d4b\u8bd5\u5730\u70b9\u3001\u5168\u9762\u6027\u80fd\u62a5\u544a<\/li>\n<\/ul>\n<h3>\u4f7f\u7528 Lighthouse \u5206\u6790\u6027\u80fd<\/h3>\n<ul>\n<li>\u672c\u5730 npm \u5b89\u88c5\uff1a npm install -g lighthouse<\/li>\n<li>lighthouse <a href=\"http:\/\/www.bilibili.com\">http:\/\/www.bilibili.com<\/a><\/li>\n<\/ul>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010415443458.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010415443458.png\" alt=\"\" \/><\/p><\/noscript>\n<h3>\u4f7f\u7528 Chrome DevTools \u5206\u6790\u6027\u80fd<\/h3>\n<h2>\u6027\u80fd\u6d4b\u91cf APIs<\/h2>\n<ul>\n<li>\u5173\u952e\u65f6\u95f4\u8282\u70b9(Navigation Timing\uff0cResource Timing)<\/li>\n<li>\u7f51\u7edc\u72b6\u6001(Network APIs)<\/li>\n<li>\u5ba2\u6237\u7aef\u670d\u52a1\u7aef\u534f\u5546(HTTP Client Hints)&amp; \u7f51\u9875\u663e\u793a\u72b6\u6001(UI APIs)<\/li>\n<\/ul>\n<h2>\u6d4f\u89c8\u5668\u7684\u6e32\u67d3\u6d41\u7a0b<\/h2>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010416185248.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010416185248.png\" alt=\"\" \/><\/p><\/noscript>\n<h3>\u6d4f\u89c8\u5668\u6784\u5efa\u5bf9\u8c61\u6a21\u578b<\/h3>\n<ul>\n<li>\u6784\u5efa DOM \u5bf9\u8c61<br \/>\nHTML-&gt;DOM<\/li>\n<li>\u6784\u5efa CSSOM \u5bf9\u8c61<br \/>\nCSS-&gt;CSSOM<\/li>\n<\/ul>\n<h3>\u6d4f\u89c8\u5668\u6784\u5efa\u6e32\u67d3\u6811<\/h3>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010416222882.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010416222882.png\" alt=\"\" \/><\/p><\/noscript>\n<h1>\u56de\u6d41\u4e0e\u91cd\u7ed8<\/h1>\n<h2>\u590d\u5408\u7ebf\u7a0b\uff08compositor thread\uff09\u4e0e\u56fe\u5c42\uff08layers\uff09<\/h2>\n<h3>\u590d\u5408\u7ebf\u7a0b\u505a\u4ec0\u4e48<\/h3>\n<ul>\n<li>\u5c06\u9875\u9762\u62c6\u5206\u56fe\u5c42\u8fdb\u884c\u7ed8\u5236\u518d\u8fdb\u884c\u590d\u5408<\/li>\n<li>\u5229\u7528 DevTools \u4e86\u89e3\u7f51\u9875\u7684\u56fe\u5c42\u62c6\u5206\u60c5\u51b5<\/li>\n<li>\u54ea\u4e9b\u6837\u5f0f\u4ec5\u5f71\u54cd\u590d\u5408<\/li>\n<\/ul>\n<h2>\u907f\u514d\u91cd\u7ed8<\/h2>\n<h2>\u9ad8\u9891 \u4e8b\u4ef6\u5904\u7406\u51fd\u6570 \u9632\u6296<\/h2>\n<h2>JS \u5f00\u9500\u548c\u5982\u4f55\u7f29\u77ed\u89e3\u6790\u65f6\u95f4<\/h2>\n<ul>\n<li>Code splitting \u4ee3\u7801\u62c6\u5206\uff0c \u6309\u9700\u52a0\u8f7d<\/li>\n<li>Tree shaking \u4ee3\u7801\u51cf\u91cd<br \/>\n<h3>\u51cf\u5c11\u4e3b\u7ebf\u7a0b\u5de5\u4f5c\u91cf<\/h3>\n<\/li>\n<li>\u907f\u514d\u957f\u4efb\u52a1<\/li>\n<li>\u907f\u514d\u8d85\u8fc7 1kb \u7684\u884c\u95f4\u811a\u672c<\/li>\n<li>\u4f7f\u7528 rAF \u548c rIC \u8fdb\u884c\u65f6\u95f4\u8c03\u5ea6<br \/>\n<h3>Progressive Bootstrapping<\/h3>\n<\/li>\n<li>\u53ef\u89c1\u4e0d\u53ef\u4ea4\u4e92 vs \u6700\u5c0f\u53ef\u4ea4\u4e92\u8d44\u6e90\u96c6<\/li>\n<li>\u5148\u52a0\u8f7d\u9996\u5c4f\u8d44\u6e90, \u5176\u4f59\u5ef6\u65f6\u52a0\u8f7d<\/li>\n<\/ul>\n<h2>V8 \u7f16\u8bd1\u539f\u7406, \u914d\u5408 V8 \u6709\u6548\u4f18\u5316\u4ee3\u7801<\/h2>\n<h3>\u62bd\u8c61\u8bed\u6cd5\u6811<\/h3>\n<ul>\n<li>\u6e90\u7801=&gt;\u62bd\u8c61\u8bed\u6cd5\u6811 =&gt;\u5b57\u8282\u7801 Bytecode =&gt; \u673a\u5668\u7801<\/li>\n<li>\u7f16\u8bd1\u8fc7\u7a0b\u4f1a\u8fdb\u884c\u4f18\u5316<\/li>\n<li>\u8fd0\u884c\u65f6\u53ef\u80fd\u53d1\u751f\u53cd\u4f18\u5316<\/li>\n<\/ul>\n<h3>V8 \u4f18\u5316\u673a\u5236<\/h3>\n<ul>\n<li>\u811a\u672c\u6d41<\/li>\n<li>\u5b57\u8282\u7801\u7f13\u5b58<\/li>\n<li>\u61d2\u89e3\u6790<\/li>\n<\/ul>\n<h2>\u51fd\u6570\u4f18\u5316<\/h2>\n<ul>\n<li>lazy parsing \u61d2\u89e3\u6790 vs eager parsing \u9965\u997f\u89e3\u6790<\/li>\n<li>\u5229\u7528 Optimize.js \u4f18\u5316\u521d\u6b21\u52a0\u8f7d\u65f6\u95f4<\/li>\n<\/ul>\n<h2>JS \u5bf9\u8c61\u4f18\u5316<\/h2>\n<ul>\n<li>\u4ee5\u76f8\u540c\u987a\u5e8f\u521d\u59cb\u5316\u5bf9\u8c61\u6210\u5458\uff0c\u907f\u514d\u9690\u85cf\u7c7b\u7684\u8c03\u6574<\/li>\n<li>\u5b9e\u4f8b\u5316\u540e\u907f\u514d\u6dfb\u52a0\u65b0\u5c5e\u6027<\/li>\n<li>\u5c3d\u91cf\u4f7f\u7528 Array \u4ee3\u66ff array-like \u5bf9\u8c61<\/li>\n<li>\u907f\u514d\u8bfb\u53d6\u8d85\u8fc7\u6570\u7ec4\u7684\u957f\u5ea6<\/li>\n<li>\u907f\u514d\u5143\u7d20\u7c7b\u578b\u8f6c\u6362<\/li>\n<\/ul>\n<pre class=\"prettyprint linenums\" ><code>\/\/1\nclass RectArea {\/\/HC0\n  constructor(l, w) {\n    this.l = l;\/\/HC1\n    this.w = w;\/\/HC2\n  }\n}\n\nconst rec1 = new RectArea(3, 4)\nconst rec2 = new RectArea(5, 6)\n\nconst car1 = {color: &#039;red&#039;}\/\/HC0\ncar1.seats = 4;\/\/HC1\nconst car2 = {seats: 2}\/\/HC2\ncar2.color = &#039;blue&#039;\/\/HC3\n\n\/\/2\nconst car3 = {color: &#039;red&#039;}\/\/In-object \u5c5e\u6027\ncar1.seats = 4;\/\/Normal\/Fast \u5c5e\u6027,\u5b58\u50a8 property store \u91cc,\u9700\u8981\u901a\u8fc7\u63cf\u8ff0\u6570\u7ec4\u95f4\u63a5\u67e5\u627e\n\n\/\/3\nArray.prototype.forEach.call(arrObj, (value, index) =&gt; {\/\/\u4e0d\u5982\u5728\u771f\u5b9e\u6570\u7ec4\u4e0a\u6548\u7387\u9ad8\n  console.log(`${index}:${value}`);\n})\n\/\/\u5c06\u7c7b\u6570\u7ec4\u5bf9\u8c61\u8f6c\u4e3a\u771f\u5b9e\u6570\u7ec4, \u518d\u904d\u5386\nconst arr=Array.prototype.slice.call(arrObj,0)\narr.forEach((value, index) =&gt; {\/\/\u8f6c\u6362\u7684\u4ee3\u4ef7\u6bd4\u4f18\u5316\u5f71\u54cd\u5c0f\n  console.log(`${index}:${value}`);\n})\n\n\/\/4\nfunction foo(array){\n  for (let i = 0; i &lt; array.length; i++) {\n    if(array[i]&gt;1000){\/\/1.\u9020\u6210 undefined \u8ddf\u6570\u5b57\u8fdb\u884c\u6bd4\u8f83 2.\u6cbf\u539f\u578b\u94fe\u7684\u67e5\u627e\n      console.log(array[i])\/\/\u4e1a\u52a1\u4e0a\u65e0\u6548,\u51fa\u9519\n    }\n  }\n}\n\/\/[10,100,1000]\n\n\/\/5\nconst array=[3,2,1];\/\/PACKED_SMI_ELEMENTS\narray.push(4.4) \/\/\u5bf9\u6570\u7ec4\u7c7b\u578b\u53c8\u4e00\u6b21\u66f4\u6539  PACKED_DOUBLE_ELEMENTS<\/code><\/pre>\n<h2>\u5b57\u4f53\u4f18\u5316<\/h2>\n<h3>\u4ec0\u4e48\u662f FOIT \u548c FOUT<\/h3>\n<ul>\n<li>\u5b57\u4f53\u672a\u4e0b\u8f7d\u5b8c\u6210\u65f6\uff0c\u6d4f\u89c8\u5668\u9690\u85cf\u6216\u81ea\u52a8\u964d\u7ea7\uff0c\u5bfc\u81f4\u5b57\u4f53\u95ea\u70c1<\/li>\n<li>Flash Of Invisible Text<\/li>\n<li>Flash Of Unstyled Text<\/li>\n<\/ul>\n<h3>\u4f7f\u7528 font-display<\/h3>\n<ul>\n<li>auto<\/li>\n<li>swap<\/li>\n<li>optional<\/li>\n<li>block<\/li>\n<li>fallback<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010712502828.png\"  alt=\"\" \/><\/li>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010712502828.png\" alt=\"\" \/><\/li><\/noscript>\n<\/ul>\n<h3>\u4f7f\u7528 AJAX+Base64<\/h3>\n<ul>\n<li>\u89e3\u51b3\u517c\u5bb9\u6027\u95ee\u9898<\/li>\n<li>\u7f3a\u70b9\uff1a\u7f13\u5b58\u95ee\u9898<\/li>\n<\/ul>\n<h2>webpack \u4f18\u5316\u914d\u7f6e<\/h2>\n<h3>Tree-shaking<\/h3>\n<ul>\n<li>\u4e0a\u4e0b\u6587\u672a\u7528\u5230\u7684\u4ee3\u7801\uff08dead code\uff09<\/li>\n<li>\u57fa\u4e8e ES6 import export<\/li>\n<li>package.json \u4e2d\u914d\u7f6e sideEffects<\/li>\n<li>\u6ce8\u610f Babel \u9ed8\u8ba4\u914d\u7f6e\u7684\u5f71\u54cd<br \/>\n<h3>JS \u538b\u7f29<\/h3>\n<\/li>\n<li>Webpack4 \u540e\u5f15\u5165 uglifyjs-webpack-plugin<\/li>\n<li>\u652f\u6301 ES6 \u66ff\u6362\u4e3a terser-webpack-plugin<\/li>\n<li>\u51cf\u5c11 JS \u6587\u4ef6\u4f53\u79ef<br \/>\n<h3>\u4f5c\u7528\u57df\u63d0\u5347<\/h3>\n<\/li>\n<li>\u4ee3\u7801\u4f53\u79ef\u51cf\u5c0f<\/li>\n<li>\u63d0\u9ad8\u6267\u884c\u6548\u7387<\/li>\n<li>\u540c\u6837\u6ce8\u610f Babel \u7684 modules \u914d\u7f6e<br \/>\n<h3>Babel7 \u4f18\u5316\u914d\u7f6e<\/h3>\n<\/li>\n<li>\u5728\u9700\u8981\u7684\u5730\u65b9\u5f15\u5165 polyfill<\/li>\n<li>\u8f85\u52a9\u51fd\u6570\u7684\u6309\u9700\u5f15\u5165<\/li>\n<li>\u6839\u636e\u76ee\u6807\u6d4f\u89c8\u5668\u6309\u9700\u8f6c\u6362\u4ee3\u7801<\/li>\n<\/ul>\n<h2>\u542f\u7528\u538b\u7f29 Gzip<\/h2>\n<ul>\n<li>\u5bf9\u4f20\u8f93\u8d44\u6e90\u8fdb\u884c\u4f53\u79ef\u538b\u7f29\uff0c\u53ef\u9ad8\u8fbe 90%<\/li>\n<li>\u5982\u4f55\u914d\u7f6e Nginx \u542f\u7528 Gzip<\/li>\n<\/ul>\n<h2>\u542f\u7528 Keep Alive<\/h2>\n<ul>\n<li>\u4e00\u4e2a\u6301\u4e45\u7684 TCP \u8fde\u63a5\uff0c\u8282\u7701\u4e86\u8fde\u63a5\u521b\u5efa\u65f6\u95f4<\/li>\n<li>Nginx \u9ed8\u8ba4\u5f00\u542f keep alive<\/li>\n<\/ul>\n<h2>HTTP \u8d44\u6e90\u7f13\u5b58<\/h2>\n<ul>\n<li>\u63d0\u9ad8\u91cd\u590d\u8bbf\u95ee\u65f6\u8d44\u6e90\u52a0\u8f7d\u7684\u901f\u5ea6<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010721231416.png\"  alt=\"\" \/><\/li>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010721231416.png\" alt=\"\" \/><\/li><\/noscript>\n<\/ul>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010721313428.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010721313428.png\" alt=\"\" \/><\/p><\/noscript>\n<h2>\u670d\u52a1\u7aef\u6e32\u67d3 SSR<\/h2>\n<ul>\n<li>\u52a0\u901f\u9996\u5c4f\u52a0\u8f7d<\/li>\n<li>\u66f4\u597d\u7684 SEO<\/li>\n<\/ul>\n<h2>\u4ece PNG \u5230 IconFont<\/h2>\n<ul>\n<li>\u591a\u4e2a\u56fe\u6807-&gt;\u4e00\u5957\u5b57\u4f53, \u51cf\u5c11\u83b7\u53d6\u65f6\u7684\u8bf7\u6c42\u6570\u91cf\u548c\u4f53\u79ef<\/li>\n<li>\u77e2\u91cf\u56fe\u5f62, \u53ef\u4f38\u7f29<\/li>\n<li>\u76f4\u63a5\u901a\u8fc7 css \u4fee\u6539\u6837\u5f0f(\u989c\u8272, \u5927\u5c0f\u7b49)<\/li>\n<\/ul>\n<h3>\u4ece iconfont \u5230 svg<\/h3>\n<ul>\n<li>\u4fdd\u6301\u4e86\u56fe\u7247\u80fd\u529b\uff0c\u652f\u6301\u591a\u8272\u5f69<\/li>\n<li>\u72ec\u7acb\u7684\u77e2\u91cf\u56fe\u5f62<\/li>\n<li>XML \u8bed\u6cd5\u641c\u7d22\u5f15\u64ce SEO \u548c\u65e0\u969c\u788d\u8bfb\u5c4f\u8f6f\u4ef6\u8bfb\u53d6<\/li>\n<\/ul>\n<h2>\u4f7f\u7528 flexbox \u4f18\u5316\u5e03\u5c40<\/h2>\n<ul>\n<li>flex \u4f7f\u7528\u6805\u683c\u5e03\u5c40<\/li>\n<li>\u66f4\u9ad8\u6027\u80fd\u7684\u5b9e\u73b0\u65b9\u6848<\/li>\n<li>\u5bb9\u5668\u6709\u80fd\u529b\u51b3\u5b9a\u5b50\u5143\u7d20\u7684\u5927\u5c0f, \u987a\u5e8f, \u5bf9\u9f50, \u95f4\u9694\u7b49<\/li>\n<li>\u53cc\u5411\u5e03\u5c40<\/li>\n<\/ul>\n<pre class=\"prettyprint linenums\" ><code>\/\/1\n&lt;!doctype html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n   &lt;meta charset=&quot;UTF-8&quot;&gt;\n   &lt;meta name=&quot;viewport&quot;\n         content=&quot;width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0&quot;&gt;\n   &lt;meta http-equiv=&quot;X-UA-Compatible&quot; content=&quot;ie=edge&quot;&gt;\n   &lt;title&gt;Document&lt;\/title&gt;\n   &lt;style&gt;\n      .main{\n         width: 100%;\n         height: 1000px;\n         background-color: gray;\n         display: flex;\n         flex-flow: row wrap;\n      }\n      .box{\n         width: 100px;\n         height: 100px;\n         background-color: red;\n         margin: 5px;\n         \/*1.float: left;*\/\n      }\n   &lt;\/style&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;div id=&quot;main&quot; class=&quot;main&quot;&gt;&lt;\/div&gt;\n&lt;script&gt;\n   window.addEventListener(&#039;load&#039;,()=&gt;{\n      let mainNode=document.getElementById(&#039;main&#039;);\n      for (let i = 0; i &lt; 10000; i++) {\n         let divNode=document.createElement(&#039;div&#039;);\n         divNode.setAttribute(&#039;class&#039;,&#039;box&#039;)\n         mainNode.appendChild(divNode);\n      }\n   })\n&lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010816055557.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010816055557.png\" alt=\"\" \/><\/p><\/noscript>\n<pre class=\"prettyprint linenums\" ><code>\/\/2\n&lt;!doctype html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n    &lt;meta charset=&quot;UTF-8&quot;&gt;\n    &lt;meta name=&quot;viewport&quot;\n          content=&quot;width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0&quot;&gt;\n    &lt;meta http-equiv=&quot;X-UA-Compatible&quot; content=&quot;ie=edge&quot;&gt;\n    &lt;title&gt;Document&lt;\/title&gt;\n    &lt;style&gt;\n        .flex-container {\n            display: flex;\n            flex-flow: row wrap;\n            justify-content: space-around;\n        }\n\n        .flex-card {\n            width: 220px;\n            height: 220px;\n            display: flex;\n            justify-content: center;\n            align-items: center;\n        }\n\n        .flex-card-number {\n            font-size: 128px;\n            color: white;\n        }\n    &lt;\/style&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;div id=&quot;flex-container&quot; class=&quot;flex-container&quot;&gt;&lt;\/div&gt;\n&lt;script&gt;\n  function generateRandomColor() {\n    let x = Math.floor(Math.random() * 256)\n    let y = Math.floor(Math.random() * 256)\n    let z = Math.floor(Math.random() * 256)\n    return &#039;rgb(&#039; + x + &#039;,&#039; + y + &#039;,&#039; + z + &#039;)&#039;\n  }\n\n  window.addEventListener(&#039;load&#039;, () =&gt; {\n    let mainNode = document.getElementById(&#039;flex-container&#039;);\n    for (let i = 0; i &lt; 10; i++) {\n      let divNode = document.createElement(&#039;div&#039;);\n      divNode.setAttribute(&#039;class&#039;, &#039;flex-card&#039;)\n      divNode.style.backgroundColor = generateRandomColor()\n      let spanNode = document.createElement(&#039;span&#039;);\n      spanNode.setAttribute(&#039;class&#039;, &#039;flex-card-number&#039;)\n      spanNode.appendChild(document.createTextNode((i + 1).toString()))\n      divNode.appendChild(spanNode);\n      mainNode.appendChild(divNode);\n    }\n  })\n&lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010816080384.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010816080384.png\" alt=\"\" \/><\/p><\/noscript>\n<pre class=\"prettyprint linenums\" ><code>\/\/3\n&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n    &lt;meta charset=&quot;UTF-8&quot;&gt;\n    &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0&quot;&gt;\n    &lt;title&gt;Title&lt;\/title&gt;\n    &lt;style&gt;\n        .wrapper{\n            display: flex;\n            flex-flow: row wrap;\n            text-align: center;\n        }\n        .wrapper&gt;*{\n            padding: 10px;\n            flex: 1 100%;\/*\u7b49\u5206, \u5bbd\u5ea6 100%*\/\n        }\n        .header{\n            background-color: red;\n        }\n        .footer{\n            background-color: pink;\n        }\n        .main{\n            background-color: aqua;\n        }\n        .nav{\n            background-color: blue;\n        }\n        .ads{\n            background-color: lightcoral;\n        }\n@media all and (min-width: 700px) {\n    .aside{\n        flex: 1 0 0;\/* \u5360\u6bd4\u6743\u91cd 1, \u4e0d\u6536\u7f29,\u5bbd\u5ea6 0,\u5269\u4f59\u7a7a\u95f4\u6309\u7167\u6743\u91cd\u5747\u5206*\/\n    }\n}\n        @media all and (min-width: 800px){\n            .main{\n                flex: 3 0 0;\n                order: 2;\n            }\n            .nav{\n                order: 1;\n            }\n            .ads{\n                order: 3;\n            }\n            .footer{\n                order: 4;\n            }\n        }\n    &lt;\/style&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;div class=&quot;wrapper&quot;&gt;\n    &lt;header class=&quot;header&quot;&gt;Header&lt;\/header&gt;\n    &lt;article class=&quot;main&quot;&gt;\n                Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aperiam, assumenda, delectus doloribus\n                doloremque eaque enim eos expedita fuga harum ipsa iure labore magnam maiores natus nihil nulla\n                pariatur quae quasi quibusdam quidem quo repellat sapiente sed similique tempora\n    &lt;\/article&gt;\n    &lt;aside class=&quot;aside nav&quot;&gt;Navigation&lt;\/aside&gt;\n    &lt;aside class=&quot;aside ads&quot;&gt;ADs&lt;\/aside&gt;\n    &lt;footer class=&quot;footer&quot;&gt;Footer&lt;\/footer&gt;\n&lt;\/div&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\n<\/code><\/pre>\n<ul>\n<li>\u4e0d\u540c\u7a97\u53e3\u663e\u793a\u4e0d\u540c<\/li>\n<\/ul>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010816023124.png\"  alt=\"\" \/> <\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010816023124.png\" alt=\"\" \/> <\/p><\/noscript>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010816033067.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010816033067.png\" alt=\"\" \/><\/p><\/noscript>\n<h2>\u8d44\u6e90\u4f18\u5148\u7ea7<\/h2>\n<ul>\n<li>\u6d4f\u89c8\u5668\u9ed8\u8ba4\u5b89\u6392\u8d44\u6e90\u52a0\u8f7d\u4f18\u5148\u7ea7<\/li>\n<li>\u4f7f\u7528 preload, prefetch \u8c03\u6574\u4f18\u5148\u7ea7<\/li>\n<\/ul>\n<h3>preload, prefetch \u9002\u7528\u573a\u666f<\/h3>\n<ul>\n<li>preload: \u63d0\u524d\u52a0\u8f7d\u8f83\u665a\u51fa\u73b0, \u4f46\u5bf9\u5f53\u524d\u9875\u9762\u975e\u5e38\u91cd\u8981\u7684\u8d44\u6e90<\/li>\n<li>prefetch: \u63d0\u524d\u52a0\u8f7d\u540e\u7ee7\u8def\u7531\u9700\u8981\u7684\u8d44\u6e90,\u4f18\u5148\u7ea7\u4f4e<\/li>\n<\/ul>\n<pre class=\"prettyprint linenums\" ><code>\/\/index.html\n&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n    &lt;meta charset=&quot;UTF-8&quot;&gt;\n    &lt;title&gt;Title&lt;\/title&gt;\n    &lt;link rel=&quot;preload&quot; href=&quot;img\/product2.png&quot; as=&quot;image&quot;&gt;\n    &lt;!--    \u9884\u52a0\u8f7d\u5b57\u4f53\u6587\u4ef6--&gt;\n    &lt;link rel=&quot;prefetch&quot; as=&quot;style&quot; href=&quot;product.css&quot;&gt;\n    &lt;style&gt;\n        .wrapper {\n            display: flex;\n            flex-flow: column;\n        }\n\n        .link {\n            width: 150px;\n            height: 150px;\n        }\n\n        .link-image {\n            width: 100px;\n            height: 100px;\n            margin: 5px;\n        }\n    &lt;\/style&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;div id=&quot;wrapper&quot; class=&quot;wrapper&quot;&gt;\n    &lt;a class=&quot;link&quot; href=&quot;product1.html&quot;&gt;\n        &lt;img class=&quot;link-image&quot; src=&quot;img\/product1.png&quot;\/&gt;\n    &lt;\/a&gt;\n    &lt;a class=&quot;link&quot; href=&quot;product2.html&quot;&gt;\n        &lt;img class=&quot;link-image&quot; src=&quot;img\/product2.png&quot;\/&gt;\n    &lt;\/a&gt;\n&lt;\/div&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<pre class=\"prettyprint linenums\" ><code>\/\/product1.html\n    &lt;link rel=&quot;stylesheet&quot; href=&quot;product.css&quot;&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;p class=&quot;content&quot;&gt;\n    \u6700\u597d\u7684\u4ea7\u54c1\u4f53\u9a8c\n&lt;\/p&gt;<\/code><\/pre>\n<pre class=\"prettyprint linenums\" ><code>\/\/product2.html\n    &lt;link rel=&quot;stylesheet&quot; href=&quot;product.css&quot;&gt;\n    &lt;link rel=&quot;preload&quot; href=&quot;https:\/\/fonts.gstatic.com\/s\/longcang\/v17\/LYjAdGP8kkgoTec8zkRQqnoq.woff2&quot; as=&quot;font&quot;\n          type=&quot;font\/woff2&quot; crossorigin=&quot;anonymous&quot;&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;p class=&quot;content&quot;&gt;\n    \u6700\u597d\u7684\u4ea7\u54c1\u4f53\u9a8c\n&lt;\/p&gt;<\/code><\/pre>\n<ul>\n<li>\u52a8\u6001 preload ,\u52a8\u6001\u89e3\u6790<\/li>\n<\/ul>\n<pre class=\"prettyprint linenums\" ><code>&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n    &lt;meta charset=&quot;UTF-8&quot;&gt;\n    &lt;title&gt;Title&lt;\/title&gt;\n    &lt;link rel=&quot;preload&quot; href=&quot;img\/product2.png&quot; as=&quot;image&quot;&gt;\n    &lt;!--    \u9884\u52a0\u8f7d\u5b57\u4f53\u6587\u4ef6--&gt;\n    &lt;link rel=&quot;prefetch&quot; as=&quot;style&quot; href=&quot;product.css&quot;&gt;\n    &lt;style&gt;\n        .wrapper {\n            display: flex;\n            flex-flow: column;\n        }\n\n        .link {\n            width: 150px;\n            height: 150px;\n        }\n\n        .link-image,.link-image-1 {\n            width: 100px;\n            height: 100px;\n            margin: 5px;\n        }\n    &lt;\/style&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;div id=&quot;wrapper&quot; class=&quot;wrapper&quot;&gt;\n    &lt;a class=&quot;link&quot; href=&quot;product1.html&quot;&gt;\n        &lt;img class=&quot;link-image-1&quot; src=&quot;img\/product1.png&quot;\/&gt;\n    &lt;\/a&gt;\n    &lt;a class=&quot;link&quot; href=&quot;product2.html&quot;&gt;\n        &lt;img class=&quot;link-image&quot; src=&quot;img\/product2.png&quot;\/&gt;\n    &lt;\/a&gt;\n&lt;\/div&gt;\n&lt;script&gt;\n    function loadResource(url){\n      let link=document.createElement(&#039;link&#039;)\n      link.rel=&#039;reload&#039;\n      link.href=url\n      link.as=&#039;image&#039;\n      document.head.appendChild(link)\n    }\n    function execResource(url){\n      let image=document.getElementById(&#039;link-image-1&#039;)\n     image.src=url\n    }\n    let url=&#039;img\/product1.png&#039;\n    \/\/\u9884\u52a0\u8f7d\u56fe\u7247\u8d44\u6e90\n    loadResource(url)\n    setTimeout(()=&gt;{\n      execResource(url)\/\/\u4e3a\u56fe\u7247\u8fdb\u884c\u52a8\u6001\u8d4b\u503c\n    },2000)\n&lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\n<\/code><\/pre>\n<h2>\u9884\u6e32\u67d3\u7684\u4f5c\u7528<\/h2>\n<ul>\n<li>\u5927\u578b\u5355\u9875\u5e94\u7528\u7684\u6027\u80fd\u74f6\u9888: JS \u4e0b\u8f7d+\u89e3\u6790+\u6267\u884c<\/li>\n<li>SSR \u7684\u4e3b\u8981\u95ee\u9898: \u727a\u7272 TTFB \u6765\u8865\u6551 First Paint; \u5b9e\u73b0\u590d\u6742<\/li>\n<li>Pre-rendering \u6253\u5305\u65f6\u63d0\u524d\u6e32\u67d3\u9875\u9762, \u6ca1\u6709\u670d\u52a1\u7aef\u53c2\u4e0e<\/li>\n<\/ul>\n<h2>Windowing(\u7a97\u53e3\u5316) \u63d0\u9ad8\u5217\u8868\u6027\u80fd?<\/h2>\n<h2>\u4f7f\u7528\u9aa8\u67b6\u7ec4\u4ef6\u51cf\u5c11\u5e03\u5c40\u79fb\u52a8?<\/h2>\n<h3>Skeletonn\/Placeholder \u7684\u4f5c\u7528?<\/h3>\n<ul>\n<li>\u5360\u4f4d<\/li>\n<li>\u63d0\u5347\u7528\u6237\u611f\u77e5\u6027\u80fd<\/li>\n<\/ul>\n<h2>\u95ee\u9898: \u4ece\u8f93\u5165 URL \u5230\u9875\u9762\u52a0\u8f7d\u663e\u793a\u5b8c\u6210\u90fd\u53d1\u751f\u4e86\u4ec0\u4e48?[\u91cd\u70b9\u7b54: \u6e32\u67d3]<\/h2>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010817321021.png\"  alt=\"\" \/><br \/>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010817321021.png\" alt=\"\" \/><br \/><\/noscript>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/202401081733005.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/202401081733005.png\" alt=\"\" \/><\/p><\/noscript>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/202401081735473.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/202401081735473.png\" alt=\"\" \/><\/p><\/noscript>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010817362075.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010817362075.png\" alt=\"\" \/><\/p><\/noscript>\n<h2>\u95ee\u9898: \u4ec0\u4e48\u662f\u9996\u5c4f\u52a0\u8f7d? \u600e\u4e48\u4f18\u5316?<\/h2>\n<ul>\n<li>\n<p>Web \u589e\u91cf\u52a0\u8f7d\u7684\u7279\u70b9\u51b3\u5b9a\u4e86\u9996\u5c4f\u6027\u80fd\u4e0d\u4f1a\u5b8c\u7f8e<\/p>\n<\/li>\n<li>\n<p>\u8fc7\u957f\u7684\u767d\u5c4f\u5f71\u54cd\u7528\u6237\u4f53\u9a8c\u548c\u7559\u5b58<\/p>\n<\/li>\n<li>\n<p>\u9996\u5c4f(above the fold)&gt;\u521d\u6b21\u5370\u8c61<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010817420088.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010817420088.png\" alt=\"\" \/><\/p><\/noscript>\n<\/li>\n<li>\n<p>\u600e\u4e48\u4f18\u5316?<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010817423577.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010817423577.png\" alt=\"\" \/><\/p><\/noscript>\n<\/li>\n<\/ul>\n<h2>javascript \u5185\u5b58\u7ba1\u7406<\/h2>\n<h3>\u95ee\u9898: JS \u662f\u600e\u6837\u7ba1\u7406\u5185\u5b58\u7684?\u4ec0\u4e48\u60c5\u51b5\u4f1a\u9020\u6210\u5185\u5b58\u6cc4\u6f0f?<\/h3>\n<ul>\n<li>\n<p>\u5185\u5b58\u6cc4\u6f0f\u4e25\u91cd\u5f71\u54cd\u6027\u80fd<\/p>\n<\/li>\n<li>\n<p>\u9ad8\u7ea7\u8bed\u8a00!=\u4e0d\u9700\u8981\u7ba1\u7406\u5185\u5b58<\/p>\n<h3>\u89e3\u7b54:<\/h3>\n<\/li>\n<li>\n<p>\u53d8\u91cf\u521b\u5efa\u65f6\u81ea\u52a8\u5206\u914d\u5185\u5b58, \u4e0d\u4f7f\u7528\u65f6&quot;\u81ea\u52a8&quot;\u91ca\u653e\u5185\u5b58--GC<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010819523568.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010819523568.png\" alt=\"\" \/><\/p><\/noscript>\n<\/li>\n<li>\n<p>\u5185\u5b58\u91ca\u653e\u7684\u4e3b\u8981\u95ee\u9898\u662f\u5982\u4f55\u786e\u5b9a\u4e0d\u518d\u9700\u8981\u4f7f\u7528\u7684\u5185\u5b58<\/p>\n<\/li>\n<li>\n<p>\u6240\u6709 GC \u90fd\u662f\u8fd1\u4f3c\u5b9e\u73b0, \u53ea\u80fd\u901a\u8fc7\u5224\u65ad\u53d8\u91cf\u662f\u5426\u8fd8\u80fd\u518d\u6b21\u8bbf\u95ee\u5230<\/p>\n<\/li>\n<\/ul>\n<p>\u4f5c\u7528\u57df<\/p>\n<ul>\n<li>\u5c40\u90e8\u53d8\u91cf, \u51fd\u6570\u6267\u884c\u5b8c, \u6ca1\u6709\u95ed\u5305\u5f15\u7528, \u5c31\u4f1a\u88ab\u6807\u8bb0\u56de\u6536<\/li>\n<li>\u5168\u5c40\u53d8\u91cf, \u76f4\u81f3\u6d4f\u89c8\u5668\u5378\u8f7d\u9875\u9762\u65f6\u91ca\u653e<\/li>\n<\/ul>\n<p>GC \u7684\u5b9e\u73b0\u673a\u5236<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010819554378.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010819554378.png\" alt=\"\" \/><\/p><\/noscript>\n<h4>\u907f\u514d\u5185\u5b58\u6cc4\u6f0f<\/h4>\n<ul>\n<li>\n<p>\u907f\u514d\u610f\u5916\u7684\u5168\u5c40\u53d8\u91cf\u4ea7\u751f<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010819572881.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010819572881.png\" alt=\"\" \/><\/p><\/noscript>\n<\/li>\n<li>\n<p>\u907f\u514d\u53cd\u590d\u8fd0\u884c\u5f15\u53d1\u5927\u91cf\u95ed\u5305<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010819580268.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2024\/01\/2024010819580268.png\" alt=\"\" \/><\/p><\/noscript>\n<\/li>\n<li>\n<p>\u907f\u514d\u8131\u79bb\u7684 DOM 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