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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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                    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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<li class="chapter active" data-level="1.5.19" data-path="3-19加载图片.html">
  
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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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                    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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                    4-2 使用 DllPlugin
            
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                    4-3 使用 HappyPack
            
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                    4-4 使用 ParallelUglifyPlugin
            
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                    4-5 使用自动刷新
            
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                    4-6 开启模块热替换
            
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                    4-7 区分环境
            
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                    4-8 压缩代码
            
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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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<li class="chapter " data-level="1.7" data-path="../5原理/">
  
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                    第5章 原理
            
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                                <h1 id="3-19-&#x52A0;&#x8F7D;&#x56FE;&#x7247;">3-19 &#x52A0;&#x8F7D;&#x56FE;&#x7247;</h1>
<p>&#x5728;&#x7F51;&#x9875;&#x4E2D;&#x4E0D;&#x53EF;&#x907F;&#x514D;&#x7684;&#x4F1A;&#x4F9D;&#x8D56;&#x56FE;&#x7247;&#x8D44;&#x6E90;&#xFF0C;&#x4F8B;&#x5982; PNG&#x3001;JPG&#x3001;GIF&#xFF0C;&#x4E0B;&#x9762;&#x6765;&#x6559;&#x4F60;&#x5982;&#x4F55;&#x7528; Webpack &#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x8D44;&#x6E90;&#x3002;</p>
<h2 id="&#x4F7F;&#x7528;-file-loader">&#x4F7F;&#x7528; file-loader</h2>
<p><a href="https://github.com/webpack-contrib/file-loader" target="_blank">file-loader</a> &#x53EF;&#x4EE5;&#x628A; JavaScript &#x548C; CSS &#x4E2D;&#x5BFC;&#x5165;&#x56FE;&#x7247;&#x7684;&#x8BED;&#x53E5;&#x66FF;&#x6362;&#x6210;&#x6B63;&#x786E;&#x7684;&#x5730;&#x5740;&#xFF0C;&#x5E76;&#x540C;&#x65F6;&#x628A;&#x6587;&#x4EF6;&#x8F93;&#x51FA;&#x5230;&#x5BF9;&#x5E94;&#x7684;&#x4F4D;&#x7F6E;&#x3002;</p>
<p>&#x4F8B;&#x5982; CSS &#x6E90;&#x7801;&#x662F;&#x8FD9;&#x6837;&#x5199;&#x7684;&#xFF1A;</p>
<pre><code class="lang-css"><span class="hljs-selector-id">#app</span> {
  <span class="hljs-attribute">background-image</span>: <span class="hljs-built_in">url</span>(./imgs/a.png);
}
</code></pre>
<p>&#x88AB; file-loader &#x8F6C;&#x6362;&#x540E;&#x8F93;&#x51FA;&#x7684; CSS &#x4F1A;&#x53D8;&#x6210;&#x8FD9;&#x6837;&#xFF1A;</p>
<pre><code class="lang-css"><span class="hljs-selector-id">#app</span> {
  <span class="hljs-attribute">background-image</span>: <span class="hljs-built_in">url</span>(5556e1251a78c5afda9ee7dd06ad109b.png);
}
</code></pre>
<p>&#x5E76;&#x4E14;&#x5728;&#x8F93;&#x51FA;&#x76EE;&#x5F55; <code>dist</code> &#x4E2D;&#x4E5F;&#x591A;&#x51FA; <code>./imgs/a.png</code> &#x5BF9;&#x5E94;&#x7684;&#x56FE;&#x7247;&#x6587;&#x4EF6; <code>5556e1251a78c5afda9ee7dd06ad109b.png</code>&#xFF0C;
&#x8F93;&#x51FA;&#x7684;&#x6587;&#x4EF6;&#x540D;&#x662F;&#x6839;&#x636E;&#x6587;&#x4EF6;&#x5185;&#x5BB9;&#x7684;&#x8BA1;&#x7B97;&#x51FA;&#x7684; Hash &#x503C;&#x3002;</p>
<p>&#x540C;&#x7406;&#x5728; JavaScript &#x4E2D;&#x5BFC;&#x5165;&#x56FE;&#x7247;&#x7684;&#x6E90;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">import</span> imgB <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./imgs/b.png&apos;</span>;

<span class="hljs-built_in">window</span>.document.getElementById(<span class="hljs-string">&apos;app&apos;</span>).innerHTML = <span class="hljs-string">`
&lt;img src=&quot;<span class="hljs-subst">${imgB}</span>&quot;/&gt;
`</span>;
</code></pre>
<p>&#x7ECF;&#x8FC7; file-loader &#x5904;&#x7406;&#x540E;&#x8F93;&#x51FA;&#x7684; JavaScript &#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-built_in">module</span>.exports = __webpack_require__.p + <span class="hljs-string">&quot;0bcc1f8d385f78e1271ebfca50668429.png&quot;</span>;
</code></pre>
<p>&#x4E5F;&#x5C31;&#x662F;&#x8BF4; <code>imgB</code> &#x7684;&#x503C;&#x5C31;&#x662F;&#x56FE;&#x7247;&#x5BF9;&#x5E94;&#x7684; URL &#x5730;&#x5740;&#x3002;</p>
<p>&#x5728; Webpack &#x4E2D;&#x4F7F;&#x7528; file-loader &#x975E;&#x5E38;&#x7B80;&#x5355;&#xFF0C;&#x76F8;&#x5173;&#x914D;&#x7F6E;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-built_in">module</span>.exports = {
  <span class="hljs-built_in">module</span>: {
    rules: [
      {
        test: <span class="hljs-regexp">/\.png$/</span>,
        use: [<span class="hljs-string">&apos;file-loader&apos;</span>]
      }
    ]
  }
};
</code></pre>
<blockquote>
<p>&#x672C;&#x5B9E;&#x4F8B; <a href="http://webpack.wuhaolin.cn/3-19&#x52A0;&#x8F7D;&#x56FE;&#x7247;file-loader.zip" target="_blank">&#x63D0;&#x4F9B;&#x9879;&#x76EE;&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a></p>
</blockquote>
<h2 id="&#x4F7F;&#x7528;-url-loader">&#x4F7F;&#x7528; url-loader</h2>
<p><a href="https://github.com/webpack-contrib/url-loader" target="_blank">url-loader</a> &#x53EF;&#x4EE5;&#x628A;&#x6587;&#x4EF6;&#x7684;&#x5185;&#x5BB9;&#x7ECF;&#x8FC7; base64 &#x7F16;&#x7801;&#x540E;&#x6CE8;&#x5165;&#x5230; JavaScript &#x6216;&#x8005; CSS &#x4E2D;&#x53BB;&#x3002;</p>
<p>&#x4F8B;&#x5982; CSS &#x6E90;&#x7801;&#x662F;&#x8FD9;&#x6837;&#x5199;&#x7684;&#xFF1A;</p>
<pre><code class="lang-css"><span class="hljs-selector-id">#app</span> {
  <span class="hljs-attribute">background-image</span>: <span class="hljs-built_in">url</span>(./imgs/a.png);
}
</code></pre>
<p>&#x88AB; url-loader &#x8F6C;&#x6362;&#x540E;&#x8F93;&#x51FA;&#x7684; CSS &#x4F1A;&#x53D8;&#x6210;&#x8FD9;&#x6837;&#xFF1A;</p>
<pre><code class="lang-css"><span class="hljs-selector-id">#app</span> {
  <span class="hljs-attribute">background-image</span>: <span class="hljs-built_in">url</span>(data:image/png;base64,iVBORw01afer...); <span class="hljs-comment">/* &#x7ED3;&#x5C3E;&#x7701;&#x7565;&#x4E86;&#x5269;&#x4E0B;&#x7684; base64 &#x7F16;&#x7801;&#x540E;&#x7684;&#x6570;&#x636E; */</span>
}
</code></pre>
<p>&#x540C;&#x7406;&#x5728; JavaScript &#x4E2D;&#x6548;&#x679C;&#x4E5F;&#x7C7B;&#x4F3C;&#x3002;</p>
<p>&#x4ECE;&#x4E0A;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;&#x53EF;&#x4EE5;&#x770B;&#x51FA; url-loader &#x4F1A;&#x628A;&#x6839;&#x636E;&#x56FE;&#x7247;&#x5185;&#x5BB9;&#x8BA1;&#x7B97;&#x51FA;&#x7684; base64 &#x7F16;&#x7801;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x76F4;&#x63A5;&#x6CE8;&#x5165;&#x5230;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x7531;&#x4E8E;&#x4E00;&#x822C;&#x7684;&#x56FE;&#x7247;&#x6570;&#x636E;&#x91CF;&#x5DE8;&#x5927;&#xFF0C;
&#x8FD9;&#x4F1A;&#x5BFC;&#x81F4; JavaScript&#x3001;CSS &#x6587;&#x4EF6;&#x4E5F;&#x8DDF;&#x7740;&#x53D8;&#x5927;&#x3002;
&#x6240;&#x4EE5;&#x5728;&#x4F7F;&#x7528; url-loader &#x65F6;&#x4E00;&#x5B9A;&#x8981;&#x6CE8;&#x610F;&#x56FE;&#x7247;&#x4F53;&#x79EF;&#x4E0D;&#x80FD;&#x592A;&#x5927;&#xFF0C;&#x4E0D;&#x7136;&#x4F1A;&#x5BFC;&#x81F4; JavaScript&#x3001;CSS &#x6587;&#x4EF6;&#x8FC7;&#x5927;&#x800C;&#x5E26;&#x6765;&#x7684;&#x7F51;&#x9875;&#x52A0;&#x8F7D;&#x7F13;&#x6162;&#x95EE;&#x9898;&#x3002;</p>
<p>&#x4E00;&#x822C;&#x5229;&#x7528; url-loader &#x628A;&#x7F51;&#x9875;&#x9700;&#x8981;&#x7528;&#x5230;&#x7684;&#x5C0F;&#x56FE;&#x7247;&#x8D44;&#x6E90;&#x6CE8;&#x5165;&#x5230;&#x4EE3;&#x7801;&#x4E2D;&#x53BB;&#xFF0C;&#x4EE5;&#x51CF;&#x5C11;&#x52A0;&#x8F7D;&#x6B21;&#x6570;&#x3002;&#x56E0;&#x4E3A;&#x5728; HTTP/1 &#x534F;&#x8BAE;&#x4E2D;&#xFF0C;&#x6BCF;&#x52A0;&#x8F7D;&#x4E00;&#x4E2A;&#x8D44;&#x6E90;&#x90FD;&#x9700;&#x8981;&#x5EFA;&#x7ACB;&#x4E00;&#x6B21; HTTP &#x94FE;&#x63A5;&#xFF0C;
&#x4E3A;&#x4E86;&#x4E00;&#x4E2A;&#x5F88;&#x5C0F;&#x7684;&#x56FE;&#x7247;&#x800C;&#x65B0;&#x5EFA;&#x4E00;&#x6B21; HTTP &#x8FDE;&#x63A5;&#x662F;&#x4E0D;&#x5212;&#x7B97;&#x7684;&#x3002;</p>
<p>url-loader &#x8003;&#x8651;&#x5230;&#x4E86;&#x4EE5;&#x4E0A;&#x95EE;&#x9898;&#xFF0C;&#x5E76;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;&#x65B9;&#x4FBF;&#x7684;&#x9009;&#x62E9; <code>limit</code>&#xFF0C;&#x8BE5;&#x9009;&#x9879;&#x7528;&#x4E8E;&#x63A7;&#x5236;&#x5F53;&#x6587;&#x4EF6;&#x5927;&#x5C0F;&#x5C0F;&#x4E8E; limit &#x65F6;&#x624D;&#x4F7F;&#x7528; url-loader&#xFF0C;&#x5426;&#x5219;&#x4F7F;&#x7528; <code>fallback</code> &#x9009;&#x9879;&#x4E2D;&#x914D;&#x7F6E;&#x7684; loader&#x3002;
&#x76F8;&#x5173; Webpack &#x914D;&#x7F6E;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-built_in">module</span>.exports = {
  <span class="hljs-built_in">module</span>: {
    rules: [
      {
        test: <span class="hljs-regexp">/\.png$/</span>,
        use: [{
          loader: <span class="hljs-string">&apos;url-loader&apos;</span>,
          options: {
            <span class="hljs-comment">// 30KB &#x4EE5;&#x4E0B;&#x7684;&#x6587;&#x4EF6;&#x91C7;&#x7528; url-loader</span>
            limit: <span class="hljs-number">1024</span> * <span class="hljs-number">30</span>,
            <span class="hljs-comment">// &#x5426;&#x5219;&#x91C7;&#x7528; file-loader&#xFF0C;&#x9ED8;&#x8BA4;&#x503C;&#x5C31;&#x662F; file-loader </span>
            fallback: <span class="hljs-string">&apos;file-loader&apos;</span>,
          }
        }]
      }
    ]
  },
};
</code></pre>
<p>&#x9664;&#x6B64;&#x4E4B;&#x5916;&#xFF0C;&#x4F60;&#x8FD8;&#x53EF;&#x4EE5;&#x505A;&#x4EE5;&#x4E0B;&#x4F18;&#x5316;&#xFF1A;</p>
<ul>
<li>&#x901A;&#x8FC7; <a href="https://www.npmjs.com/package/imagemin-webpack-plugin" target="_blank">imagemin-webpack-plugin</a> &#x538B;&#x7F29;&#x56FE;&#x7247;&#xFF1B;</li>
<li>&#x901A;&#x8FC7; <a href="https://www.npmjs.com/package/webpack-spritesmith" target="_blank">webpack-spritesmith</a> &#x63D2;&#x4EF6;&#x5236;&#x4F5C;&#x96EA;&#x78A7;&#x56FE;&#x3002;</li>
</ul>
<blockquote>
<p>&#x4EE5;&#x4E0A;&#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x7684;&#x65B9;&#x6CD5;&#x540C;&#x6837;&#x9002;&#x7528;&#x4E8E;&#x5176;&#x5B83;&#x4E8C;&#x8FDB;&#x5236;&#x7C7B;&#x578B;&#x7684;&#x8D44;&#x6E90;&#xFF0C;&#x4F8B;&#x5982; PDF&#x3001;SWF &#x7B49;&#x7B49;&#x3002;</p>
<p>&#x672C;&#x5B9E;&#x4F8B; <a href="http://webpack.wuhaolin.cn/3-19&#x52A0;&#x8F7D;&#x56FE;&#x7247;url-loader.zip" target="_blank">&#x63D0;&#x4F9B;&#x9879;&#x76EE;&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a></p>
</blockquote>

                                
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