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class="text" data-v-6646d2d3>JavaScript基础</p><!--]--><!----></a><div class="caret" role="button" data-v-6646d2d3><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-6646d2d3 data-v-6646d2d3><div class="item" data-v-6646d2d3><div class="indicator" data-v-6646d2d3></div><a class="VPLink link link" href="/note/CSS.html" data-v-6646d2d3 data-v-857b9044><!--[--><p class="text" data-v-6646d2d3>CSS基础</p><!--]--><!----></a><div class="caret" role="button" data-v-6646d2d3><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-6646d2d3 data-v-6646d2d3><div class="item" data-v-6646d2d3><div class="indicator" data-v-6646d2d3></div><a class="VPLink link link" href="/note/JavaScriptEnhanced.html" data-v-6646d2d3 data-v-857b9044><!--[--><p class="text" data-v-6646d2d3>JavaScript进阶</p><!--]--><!----></a><div class="caret" role="button" data-v-6646d2d3><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link is-active has-active" data-v-6646d2d3 data-v-6646d2d3><div class="item" data-v-6646d2d3><div class="indicator" data-v-6646d2d3></div><a class="VPLink link link" href="/note/Front-end%20Engineering.html" data-v-6646d2d3 data-v-857b9044><!--[--><p class="text" data-v-6646d2d3>前端工程化</p><!--]--><!----></a><div class="caret" role="button" data-v-6646d2d3><!----></div></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-23299678 data-v-f76a1d95><div class="VPDoc has-sidebar has-aside" data-v-f76a1d95 data-v-e32ad3fb><div class="container" data-v-e32ad3fb><div class="aside" data-v-e32ad3fb><div class="aside-curtain" data-v-e32ad3fb></div><div class="aside-container" data-v-e32ad3fb><div class="aside-content" data-v-e32ad3fb><div class="VPDocAside" data-v-e32ad3fb data-v-1b364ca7><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" data-v-1b364ca7 data-v-ac019323><div class="content" data-v-ac019323><div class="outline-marker" data-v-ac019323></div><div class="outline-title" data-v-ac019323>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-ac019323><span class="visually-hidden" id="doc-outline-aria-label" data-v-ac019323> Table of Contents for current page </span><ul class="root" data-v-ac019323 data-v-e23b97f7><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-1b364ca7></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-e32ad3fb><div class="content-container" data-v-e32ad3fb><!--[--><!--]--><main class="main" data-v-e32ad3fb><div style="position:relative;" class="vp-doc _note_Front-end%20Engineering" data-v-e32ad3fb><div><h1 id="前端工程化" tabindex="-1">前端工程化 <a class="header-anchor" href="#前端工程化" aria-hidden="true">#</a></h1><h2 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-hidden="true">#</a></h2><ul><li>什么是Node.JS Node的应用场景</li><li>JS代码执行</li><li>Node的输入和输出</li><li>Node的全局对象</li></ul><h3 id="什么是node-js" tabindex="-1">什么是Node.js <a class="header-anchor" href="#什么是node-js" aria-hidden="true">#</a></h3><p>Node.js是一个基于<strong>V8 JavaScript引擎</strong>的<strong>JavaScript运行时环境</strong></p><ul><li>V8可以嵌入到任何C++应用程序中，无论是Chrome还是Node.js，事实上都嵌入了V8引擎来执行JavaScript代码</li><li>在Chrome浏览器中，还需要解析、渲染HTML、CSS等相关渲染引擎，另外还需要支持浏览器操作的API、浏览器自己的事件循环</li><li>在Node.js中我们也需要进行一些额外操作：文件系统读写、网络IO、加密、压缩解压文件等</li></ul><p>可以简单总结出Node.js和浏览器的区别</p><ul><li><p>Chrome浏览器</p><ul><li><p>Blink负责解析HTML文档，遇到JavaScript标签时将内容交给V8引擎</p></li><li><blockquote><p>Blink 是 Google Chrome 浏览器的渲染引擎，V8 是 Blink 内置的 JavaScript 引擎</p></blockquote><ul><li>预分析：检查语法错误但不生成AST树</li><li>生成AST：语法分析、词法分析后，生成抽象语法树（AST） <ul><li>AST 为每一行代码定义键值对。初始类型标识符定义 AST 属于一个程序，然后所有代码行将定义在主体内部，主体是一个对象数组。</li></ul></li><li>生成字节码：基线编译器（Ignition）将 AST 转换为字节码</li><li>生成机器代码：优化编译器 (Turbofan) 将字节码转换为优化的机器代码。另外，在逐行执行字节码的过程中，<strong>如果一段代码经常被执行，V8会直接将这段代码转换并保存为机器码</strong>，下次执行不需要经过字节码，优化了执行速度</li></ul></li></ul></li><li><p>Node.js</p><ul><li>只处理JavaScript代码 内部V8引擎负责JS代码的执行</li><li>JavaScript代码 -> V8 -> Node.js Bindings -> LibUV</li><li>LibUV是使用<strong>C语言编写的库</strong>，提供了<strong>事件循环、文件系统读写、网络IO、线程池</strong>等等内容</li></ul></li></ul><p></p><h3 id="node-js的应用场景" tabindex="-1">Node.js的应用场景 <a class="header-anchor" href="#node-js的应用场景" aria-hidden="true">#</a></h3><ul><li>前端开发的库都是以node包形式管理的</li><li>npm yarn pnpm成为前端开发使用最多的工具</li><li>使用Node.js作为Web服务器开发、中间件、代理服务器</li><li>借助Node.js完成前后端渲染的同构应用</li><li>编写脚本工具 构建项目 打包代码等</li><li>Electron桌面应用程序</li></ul></div></div></main><!--[--><!--]--><footer class="VPDocFooter" data-v-e32ad3fb data-v-26128c3c><div class="edit-info" data-v-26128c3c><div class="edit-link" data-v-26128c3c><a class="VPLink link edit-link-button" href="https://github.com/ZiuChen/ZiuChen.github.io/edit/main/docs/note/Front-end Engineering.md" target="_blank" rel="noreferrer" data-v-26128c3c data-v-857b9044><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" data-v-26128c3c><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page on GitHub<!--]--><!----></a></div><div class="last-updated" data-v-26128c3c><p class="VPLastUpdated" data-v-26128c3c data-v-a6a422eb>Updated Date: <time datetime="2023-02-07T15:31:06.000Z" data-v-a6a422eb></time></p></div></div><div class="prev-next" data-v-26128c3c><div class="pager" 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