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                    深入浅出 Webpack
            
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                    前言
            
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                    第1章 入门
            
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                    1-1 前端的发展
            
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                    1-2 常见的构建工具及对比
            
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                    1-3 安装与使用
            
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                    1-4 使用 Loader
            
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                    1-5 使用 Plugin
            
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                    1-6 使用 DevServer
            
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                    1-7 核心概念
            
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                    第2章 配置
            
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                    2-1 Entry
            
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                    2-2 Output
            
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                    2-3 Module
            
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                    2-4 Resolve
            
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                    2-5 Plugins
            
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                    2-6 DevServer
            
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                    2-7 其它配置项
            
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                    2-8 整体配置结构
            
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                    2-9 多种配置类型
            
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                    2-10 配置总结
            
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                    第3章 实战
            
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                    3-1 使用 ES6 语言
            
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                    3-2 使用 TypeScript 语言
            
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                    3-3 使用 Flow 检查器
            
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                    3-4 使用 SCSS
            
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<li class="chapter " data-level="1.5.5" data-path="../3实战/3-5使用PostCSS.html">
  
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                    3-5 使用 PostCSS
            
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                    3-6 使用 React 框架
            
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                    3-7 使用 Vue 框架
            
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                    3-8 使用 Angular2 框架
            
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                    3-9 为单页应用生成 HTML
            
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                    3-10 管理多个单页应用
            
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                    3-11 构建同构应用
            
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                    3-12 构建 Electron 应用
            
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                    3-13 构建 Npm 模块
            
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                    3-14 构建离线应用
            
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                    3-15 搭配 Npm Script
            
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                    3-16 检查代码
            
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                    3-17 通过 Node.js API 启动 Webpack
            
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                    3-18 使用 Webpack Dev Middleware
            
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                    3-19 加载图片
            
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                    3-20 加载SVG
            
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                    3-21 加载 Source Map
            
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<li class="chapter " data-level="1.5.22" data-path="../3实战/3-22实战总结.html">
  
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                    3-22 实战总结
            
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<li class="chapter " data-level="1.6" data-path="../4优化/">
  
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                    第4章 优化
            
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                    4-1 缩小文件搜索范围
            
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<li class="chapter " data-level="1.6.2" data-path="../4优化/4-2使用DllPlugin.html">
  
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                    4-2 使用 DllPlugin
            
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<li class="chapter " data-level="1.6.3" data-path="../4优化/4-3使用HappyPack.html">
  
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                    4-3 使用 HappyPack
            
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                    4-4 使用 ParallelUglifyPlugin
            
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<li class="chapter " data-level="1.6.5" data-path="../4优化/4-5使用自动刷新.html">
  
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                    4-5 使用自动刷新
            
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<li class="chapter " data-level="1.6.6" data-path="../4优化/4-6开启模块热替换.html">
  
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                    4-6 开启模块热替换
            
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<li class="chapter " data-level="1.6.7" data-path="../4优化/4-7区分环境.html">
  
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                    4-7 区分环境
            
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<li class="chapter " data-level="1.6.8" data-path="../4优化/4-8压缩代码.html">
  
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                    4-8 压缩代码
            
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<li class="chapter " data-level="1.6.9" data-path="../4优化/4-9CDN加速.html">
  
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                    4-9 CDN 加速
            
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<li class="chapter " data-level="1.6.10" data-path="../4优化/4-10使用TreeShaking.html">
  
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                    4-10 使用 Tree Shaking
            
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<li class="chapter " data-level="1.6.11" data-path="../4优化/4-11提取公共代码.html">
  
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                    4-11 提取公共代码
            
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<li class="chapter " data-level="1.6.12" data-path="../4优化/4-12按需加载.html">
  
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                    4-12 按需加载
            
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<li class="chapter " data-level="1.6.13" data-path="../4优化/4-13使用Prepack.html">
  
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                    4-13 使用 Prepack
            
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<li class="chapter " data-level="1.6.14" data-path="../4优化/4-14开启ScopeHoisting.html">
  
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                    4-14 开启 Scope Hoisting
            
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<li class="chapter " data-level="1.6.15" data-path="../4优化/4-15输出分析.html">
  
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                    4-15 输出分析
            
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<li class="chapter " data-level="1.6.16" data-path="../4优化/4-16优化总结.html">
  
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                    4-16 优化总结
            
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        <a href=".." >2-1 Entry</a>
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                                <h1 id="2-1-entry">2-1 Entry</h1>
<p><code>entry</code>&#x662F;&#x914D;&#x7F6E;&#x6A21;&#x5757;&#x7684;&#x5165;&#x53E3;&#xFF0C;&#x53EF;&#x62BD;&#x8C61;&#x6210;&#x8F93;&#x5165;&#xFF0C;Webpack &#x6267;&#x884C;&#x6784;&#x5EFA;&#x7684;&#x7B2C;&#x4E00;&#x6B65;&#x5C06;&#x4ECE;&#x5165;&#x53E3;&#x5F00;&#x59CB;&#x641C;&#x5BFB;&#x53CA;&#x9012;&#x5F52;&#x89E3;&#x6790;&#x51FA;&#x6240;&#x6709;&#x5165;&#x53E3;&#x4F9D;&#x8D56;&#x7684;&#x6A21;&#x5757;&#x3002;</p>
<p><code>entry</code> &#x914D;&#x7F6E;&#x662F;<strong>&#x5FC5;&#x586B;&#x7684;</strong>&#xFF0C;&#x82E5;&#x4E0D;&#x586B;&#x5219;&#x5C06;&#x5BFC;&#x81F4; Webpack &#x62A5;&#x9519;&#x9000;&#x51FA;&#x3002;</p>
<h2 id="context">context</h2>
<p>Webpack &#x5728;&#x5BFB;&#x627E;&#x76F8;&#x5BF9;&#x8DEF;&#x5F84;&#x7684;&#x6587;&#x4EF6;&#x65F6;&#x4F1A;&#x4EE5; <code>context</code> &#x4E3A;&#x6839;&#x76EE;&#x5F55;&#xFF0C;<code>context</code> &#x9ED8;&#x8BA4;&#x4E3A;&#x6267;&#x884C;&#x542F;&#x52A8; Webpack &#x65F6;&#x6240;&#x5728;&#x7684;&#x5F53;&#x524D;&#x5DE5;&#x4F5C;&#x76EE;&#x5F55;&#x3002;
&#x5982;&#x679C;&#x60F3;&#x6539;&#x53D8; <code>context</code> &#x7684;&#x9ED8;&#x8BA4;&#x914D;&#x7F6E;&#xFF0C;&#x5219;&#x53EF;&#x4EE5;&#x5728;&#x914D;&#x7F6E;&#x6587;&#x4EF6;&#x91CC;&#x8FD9;&#x6837;&#x8BBE;&#x7F6E;&#x5B83;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-built_in">module</span>.exports = {
  context: path.resolve(__dirname, <span class="hljs-string">&apos;app&apos;</span>)
}
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C; <code>context</code> &#x5FC5;&#x987B;&#x662F;&#x4E00;&#x4E2A;&#x7EDD;&#x5BF9;&#x8DEF;&#x5F84;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x3002;
&#x9664;&#x6B64;&#x4E4B;&#x5916;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x5728;&#x542F;&#x52A8; Webpack &#x65F6;&#x5E26;&#x4E0A;&#x53C2;&#x6570; <code>webpack --context</code> &#x6765;&#x8BBE;&#x7F6E; <code>context</code>&#x3002;</p>
<p>&#x4E4B;&#x6240;&#x4EE5;&#x5728;&#x8FD9;&#x91CC;&#x5148;&#x4ECB;&#x7ECD; <code>context</code>&#xFF0C;&#x662F;&#x56E0;&#x4E3A; Entry &#x7684;&#x8DEF;&#x5F84;&#x548C;&#x5176;&#x4F9D;&#x8D56;&#x7684;&#x6A21;&#x5757;&#x7684;&#x8DEF;&#x5F84;&#x53EF;&#x80FD;&#x91C7;&#x7528;&#x76F8;&#x5BF9;&#x4E8E; <code>context</code> &#x7684;&#x8DEF;&#x5F84;&#x6765;&#x63CF;&#x8FF0;&#xFF0C;<code>context</code> &#x4F1A;&#x5F71;&#x54CD;&#x5230;&#x8FD9;&#x4E9B;&#x76F8;&#x5BF9;&#x8DEF;&#x5F84;&#x6240;&#x6307;&#x5411;&#x7684;&#x771F;&#x5B9E;&#x6587;&#x4EF6;&#x3002;</p>
<h2 id="entry-&#x7C7B;&#x578B;">Entry &#x7C7B;&#x578B;</h2>
<p>Entry &#x7C7B;&#x578B;&#x53EF;&#x4EE5;&#x662F;&#x4EE5;&#x4E0B;&#x4E09;&#x79CD;&#x4E2D;&#x7684;&#x4E00;&#x79CD;&#x6216;&#x8005;&#x76F8;&#x4E92;&#x7EC4;&#x5408;&#xFF1A;</p>
<table>
<thead>
<tr>
<th>&#x7C7B;&#x578B;</th>
<th>&#x4F8B;&#x5B50;</th>
<th>&#x542B;&#x4E49;</th>
</tr>
</thead>
<tbody>
<tr>
<td>string</td>
<td><code>&apos;./app/entry&apos;</code></td>
<td>&#x5165;&#x53E3;&#x6A21;&#x5757;&#x7684;&#x6587;&#x4EF6;&#x8DEF;&#x5F84;&#xFF0C;&#x53EF;&#x4EE5;&#x662F;&#x76F8;&#x5BF9;&#x8DEF;&#x5F84;&#x3002;</td>
</tr>
<tr>
<td>array</td>
<td><code>[&apos;./app/entry1&apos;, &apos;./app/entry2&apos;]</code></td>
<td>&#x5165;&#x53E3;&#x6A21;&#x5757;&#x7684;&#x6587;&#x4EF6;&#x8DEF;&#x5F84;&#xFF0C;&#x53EF;&#x4EE5;&#x662F;&#x76F8;&#x5BF9;&#x8DEF;&#x5F84;&#x3002;</td>
</tr>
<tr>
<td>object</td>
<td><code>{ a: &apos;./app/entry-a&apos;, b: [&apos;./app/entry-b1&apos;, &apos;./app/entry-b2&apos;]}</code></td>
<td>&#x914D;&#x7F6E;&#x591A;&#x4E2A;&#x5165;&#x53E3;&#xFF0C;&#x6BCF;&#x4E2A;&#x5165;&#x53E3;&#x751F;&#x6210;&#x4E00;&#x4E2A; Chunk</td>
</tr>
</tbody>
</table>
<p>&#x5982;&#x679C;&#x662F; <code>array</code> &#x7C7B;&#x578B;&#xFF0C;&#x5219;&#x642D;&#x914D; <code>output.library</code> &#x914D;&#x7F6E;&#x9879;&#x4F7F;&#x7528;&#x65F6;&#xFF0C;&#x53EA;&#x6709;&#x6570;&#x7EC4;&#x91CC;&#x7684;&#x6700;&#x540E;&#x4E00;&#x4E2A;&#x5165;&#x53E3;&#x6587;&#x4EF6;&#x7684;&#x6A21;&#x5757;&#x4F1A;&#x88AB;&#x5BFC;&#x51FA;&#x3002;</p>
<h2 id="chunk-&#x540D;&#x79F0;">Chunk &#x540D;&#x79F0;</h2>
<p>Webpack &#x4F1A;&#x4E3A;&#x6BCF;&#x4E2A;&#x751F;&#x6210;&#x7684; Chunk &#x53D6;&#x4E00;&#x4E2A;&#x540D;&#x79F0;&#xFF0C;Chunk &#x7684;&#x540D;&#x79F0;&#x548C; Entry &#x7684;&#x914D;&#x7F6E;&#x6709;&#x5173;&#xFF1A;</p>
<ul>
<li>&#x5982;&#x679C; <code>entry</code> &#x662F;&#x4E00;&#x4E2A; <code>string</code> &#x6216; <code>array</code>&#xFF0C;&#x5C31;&#x53EA;&#x4F1A;&#x751F;&#x6210;&#x4E00;&#x4E2A; Chunk&#xFF0C;&#x8FD9;&#x65F6; Chunk &#x7684;&#x540D;&#x79F0;&#x662F; <code>main</code>&#xFF1B;</li>
<li>&#x5982;&#x679C; <code>entry</code> &#x662F;&#x4E00;&#x4E2A; <code>object</code>&#xFF0C;&#x5C31;&#x53EF;&#x80FD;&#x4F1A;&#x51FA;&#x73B0;&#x591A;&#x4E2A; Chunk&#xFF0C;&#x8FD9;&#x65F6; Chunk &#x7684;&#x540D;&#x79F0;&#x662F; <code>object</code> &#x952E;&#x503C;&#x5BF9;&#x91CC;&#x952E;&#x7684;&#x540D;&#x79F0;&#x3002;</li>
</ul>
<h2 id="&#x914D;&#x7F6E;&#x52A8;&#x6001;-entry">&#x914D;&#x7F6E;&#x52A8;&#x6001; Entry</h2>
<p>&#x5047;&#x5982;&#x9879;&#x76EE;&#x91CC;&#x6709;&#x591A;&#x4E2A;&#x9875;&#x9762;&#x9700;&#x8981;&#x4E3A;&#x6BCF;&#x4E2A;&#x9875;&#x9762;&#x7684;&#x5165;&#x53E3;&#x914D;&#x7F6E;&#x4E00;&#x4E2A; Entry &#xFF0C;&#x4F46;&#x8FD9;&#x4E9B;&#x9875;&#x9762;&#x7684;&#x6570;&#x91CF;&#x53EF;&#x80FD;&#x4F1A;&#x4E0D;&#x65AD;&#x589E;&#x957F;&#xFF0C;&#x5219;&#x8FD9;&#x65F6; Entry &#x7684;&#x914D;&#x7F6E;&#x4F1A;&#x53D7;&#x5230;&#x5230;&#x5176;&#x4ED6;&#x56E0;&#x7D20;&#x7684;&#x5F71;&#x54CD;&#x5BFC;&#x81F4;&#x4E0D;&#x80FD;&#x5199;&#x6210;&#x9759;&#x6001;&#x7684;&#x503C;&#x3002;&#x5176;&#x89E3;&#x51B3;&#x65B9;&#x6CD5;&#x662F;&#x628A; Entry &#x8BBE;&#x7F6E;&#x6210;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x53BB;&#x52A8;&#x6001;&#x8FD4;&#x56DE;&#x4E0A;&#x9762;&#x6240;&#x8BF4;&#x7684;&#x914D;&#x7F6E;&#xFF0C;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-comment">// &#x540C;&#x6B65;&#x51FD;&#x6570;</span>
entry: () =&gt; {
  <span class="hljs-keyword">return</span> {
    a:<span class="hljs-string">&apos;./pages/a&apos;</span>,
    b:<span class="hljs-string">&apos;./pages/b&apos;</span>,
  }
};
<span class="hljs-comment">// &#x5F02;&#x6B65;&#x51FD;&#x6570;</span>
entry: () =&gt; {
  <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>((resolve)=&gt;{
    resolve({
       a:<span class="hljs-string">&apos;./pages/a&apos;</span>,
       b:<span class="hljs-string">&apos;./pages/b&apos;</span>,
    });
  });
};
</code></pre>

                                
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