webpack5-tutorial/docs/.vuepress/.temp/pages/senior/reduceVolume.html.vue

<template><h1 id="减少代码体积" tabindex="-1"><a class="header-anchor" href="#减少代码体积" aria-hidden="true">#</a> 减少代码体积</h1>
<h2 id="tree-shaking" tabindex="-1"><a class="header-anchor" href="#tree-shaking" aria-hidden="true">#</a> Tree Shaking</h2>
<h3 id="为什么" tabindex="-1"><a class="header-anchor" href="#为什么" aria-hidden="true">#</a> 为什么</h3>
<p>开发时我们定义了一些工具函数库，或者引用第三方工具函数库或组件库。</p>
<p>如果没有特殊处理的话我们打包时会引入整个库，但是实际上可能我们可能只用上极小部分的功能。</p>
<p>这样将整个库都打包进来，体积就太大了。</p>
<h3 id="是什么" tabindex="-1"><a class="header-anchor" href="#是什么" aria-hidden="true">#</a> 是什么</h3>
<p><code>Tree Shaking</code> 是一个术语，通常用于描述移除 JavaScript 中的没有使用上的代码。</p>
<p><strong>注意：它依赖 <code>ES Module</code>。</strong></p>
<h3 id="怎么用" tabindex="-1"><a class="header-anchor" href="#怎么用" aria-hidden="true">#</a> 怎么用</h3>
<p>Webpack 已经默认开启了这个功能，无需其他配置。</p>
<h2 id="babel" tabindex="-1"><a class="header-anchor" href="#babel" aria-hidden="true">#</a> Babel</h2>
<h3 id="为什么-1" tabindex="-1"><a class="header-anchor" href="#为什么-1" aria-hidden="true">#</a> 为什么</h3>
<p>Babel 为编译的每个文件都插入了辅助代码，使代码体积过大！</p>
<p>Babel 对一些公共方法使用了非常小的辅助代码，比如 <code>_extend</code>。默认情况下会被添加到每一个需要它的文件中。</p>
<p>你可以将这些辅助代码作为一个独立模块，来避免重复引入。</p>
<h3 id="是什么-1" tabindex="-1"><a class="header-anchor" href="#是什么-1" aria-hidden="true">#</a> 是什么</h3>
<p><code>@babel/plugin-transform-runtime</code>: 禁用了 Babel 自动对每个文件的 runtime 注入，而是引入 <code>@babel/plugin-transform-runtime</code> 并且使所有辅助代码从这里引用。</p>
<h3 id="怎么用-1" tabindex="-1"><a class="header-anchor" href="#怎么用-1" aria-hidden="true">#</a> 怎么用</h3>
<ol>
<li>下载包</li>
</ol>
<div class="language-text ext-text line-numbers-mode"><pre v-pre class="language-text"><code>npm i @babel/plugin-transform-runtime -D
</code></pre><div class="line-numbers" aria-hidden="true"><span class="line-number">1</span><br></div></div><ol start="2">
<li>配置</li>
</ol>
<div class="language-javascript ext-js line-numbers-mode"><pre v-pre class="language-javascript"><code><span class="token keyword">const</span> os <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"os"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"path"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> ESLintWebpackPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"eslint-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> HtmlWebpackPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"html-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> MiniCssExtractPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"mini-css-extract-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> CssMinimizerPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"css-minimizer-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> TerserPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"terser-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// cpu核数</span>
<span class="token keyword">const</span> threads <span class="token operator">=</span> os<span class="token punctuation">.</span><span class="token function">cpus</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span>

<span class="token comment">// 获取处理样式的Loaders</span>
<span class="token keyword">const</span> <span class="token function-variable function">getStyleLoaders</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">preProcessor</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">[</span>
    MiniCssExtractPlugin<span class="token punctuation">.</span>loader<span class="token punctuation">,</span>
    <span class="token string">"css-loader"</span><span class="token punctuation">,</span>
    <span class="token punctuation">{</span>
      <span class="token literal-property property">loader</span><span class="token operator">:</span> <span class="token string">"postcss-loader"</span><span class="token punctuation">,</span>
      <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">postcssOptions</span><span class="token operator">:</span> <span class="token punctuation">{</span>
          <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>
            <span class="token string">"postcss-preset-env"</span><span class="token punctuation">,</span> <span class="token comment">// 能解决大多数样式兼容性问题</span>
          <span class="token punctuation">]</span><span class="token punctuation">,</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    preProcessor<span class="token punctuation">,</span>
  <span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>Boolean<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
  <span class="token literal-property property">entry</span><span class="token operator">:</span> <span class="token string">"./src/main.js"</span><span class="token punctuation">,</span>
  <span class="token literal-property property">output</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">path</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">"../dist"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment">// 生产模式需要输出</span>
    <span class="token literal-property property">filename</span><span class="token operator">:</span> <span class="token string">"static/js/main.js"</span><span class="token punctuation">,</span> <span class="token comment">// 将 js 文件输出到 static/js 目录中</span>
    <span class="token literal-property property">clean</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  <span class="token literal-property property">module</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">rules</span><span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span>
        <span class="token literal-property property">oneOf</span><span class="token operator">:</span> <span class="token punctuation">[</span>
          <span class="token punctuation">{</span>
            <span class="token comment">// 用来匹配 .css 结尾的文件</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.css$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token comment">// use 数组里面 Loader 执行顺序是从右到左</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token function">getStyleLoaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.less$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token function">getStyleLoaders</span><span class="token punctuation">(</span><span class="token string">"less-loader"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.s[ac]ss$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token function">getStyleLoaders</span><span class="token punctuation">(</span><span class="token string">"sass-loader"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.styl$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token function">getStyleLoaders</span><span class="token punctuation">(</span><span class="token string">"stylus-loader"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.(png|jpe?g|gif|webp)$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">"asset"</span><span class="token punctuation">,</span>
            <span class="token literal-property property">parser</span><span class="token operator">:</span> <span class="token punctuation">{</span>
              <span class="token literal-property property">dataUrlCondition</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                <span class="token literal-property property">maxSize</span><span class="token operator">:</span> <span class="token number">10</span> <span class="token operator">*</span> <span class="token number">1024</span><span class="token punctuation">,</span> <span class="token comment">// 小于10kb的图片会被base64处理</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token literal-property property">generator</span><span class="token operator">:</span> <span class="token punctuation">{</span>
              <span class="token comment">// 将图片文件输出到 static/imgs 目录中</span>
              <span class="token comment">// 将图片文件命名 [hash:8][ext][query]</span>
              <span class="token comment">// [hash:8]: hash值取8位</span>
              <span class="token comment">// [ext]: 使用之前的文件扩展名</span>
              <span class="token comment">// [query]: 添加之前的query参数</span>
              <span class="token literal-property property">filename</span><span class="token operator">:</span> <span class="token string">"static/imgs/[hash:8][ext][query]"</span><span class="token punctuation">,</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.(ttf|woff2?)$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">"asset/resource"</span><span class="token punctuation">,</span>
            <span class="token literal-property property">generator</span><span class="token operator">:</span> <span class="token punctuation">{</span>
              <span class="token literal-property property">filename</span><span class="token operator">:</span> <span class="token string">"static/media/[hash:8][ext][query]"</span><span class="token punctuation">,</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.js$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token comment">// exclude: /node_modules/, // 排除node_modules代码不编译</span>
            <span class="token literal-property property">include</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">"../src"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment">// 也可以用包含</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token punctuation">[</span>
              <span class="token punctuation">{</span>
                <span class="token literal-property property">loader</span><span class="token operator">:</span> <span class="token string">"thread-loader"</span><span class="token punctuation">,</span> <span class="token comment">// 开启多进程</span>
                <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                  <span class="token literal-property property">workers</span><span class="token operator">:</span> threads<span class="token punctuation">,</span> <span class="token comment">// 数量</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
              <span class="token punctuation">{</span>
                <span class="token literal-property property">loader</span><span class="token operator">:</span> <span class="token string">"babel-loader"</span><span class="token punctuation">,</span>
                <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                  <span class="token literal-property property">cacheDirectory</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token comment">// 开启babel编译缓存</span>
                  <span class="token literal-property property">cacheCompression</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token comment">// 缓存文件不要压缩</span>
                  <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">"@babel/plugin-transform-runtime"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token comment">// 减少代码体积</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token punctuation">]</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token punctuation">]</span><span class="token punctuation">,</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>
    <span class="token keyword">new</span> <span class="token class-name">ESLintWebpackPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      <span class="token comment">// 指定检查文件的根目录</span>
      <span class="token literal-property property">context</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">"../src"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token literal-property property">exclude</span><span class="token operator">:</span> <span class="token string">"node_modules"</span><span class="token punctuation">,</span> <span class="token comment">// 默认值</span>
      <span class="token literal-property property">cache</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token comment">// 开启缓存</span>
      <span class="token comment">// 缓存目录</span>
      <span class="token literal-property property">cacheLocation</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>
        __dirname<span class="token punctuation">,</span>
        <span class="token string">"../node_modules/.cache/.eslintcache"</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      threads<span class="token punctuation">,</span> <span class="token comment">// 开启多进程</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">HtmlWebpackPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      <span class="token comment">// 以 public/index.html 为模板创建文件</span>
      <span class="token comment">// 新的html文件有两个特点：1. 内容和源文件一致 2. 自动引入打包生成的js等资源</span>
      <span class="token literal-property property">template</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">"../public/index.html"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token comment">// 提取css成单独文件</span>
    <span class="token keyword">new</span> <span class="token class-name">MiniCssExtractPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      <span class="token comment">// 定义输出文件名和目录</span>
      <span class="token literal-property property">filename</span><span class="token operator">:</span> <span class="token string">"static/css/main.css"</span><span class="token punctuation">,</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token comment">// css压缩</span>
    <span class="token comment">// new CssMinimizerPlugin(),</span>
  <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token literal-property property">optimization</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">minimizer</span><span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token comment">// css压缩也可以写到optimization.minimizer里面，效果一样的</span>
      <span class="token keyword">new</span> <span class="token class-name">CssMinimizerPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token comment">// 当生产模式会默认开启TerserPlugin，但是我们需要进行其他配置，就要重新写了</span>
      <span class="token keyword">new</span> <span class="token class-name">TerserPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        <span class="token literal-property property">parallel</span><span class="token operator">:</span> threads<span class="token punctuation">,</span> <span class="token comment">// 开启多进程</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">]</span>
  <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token comment">// devServer: {</span>
  <span class="token comment">//   host: "localhost", // 启动服务器域名</span>
  <span class="token comment">//   port: "3000", // 启动服务器端口号</span>
  <span class="token comment">//   open: true, // 是否自动打开浏览器</span>
  <span class="token comment">// },</span>
  <span class="token literal-property property">mode</span><span class="token operator">:</span> <span class="token string">"production"</span><span class="token punctuation">,</span>
  <span class="token literal-property property">devtool</span><span class="token operator">:</span> <span class="token string">"source-map"</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre><div class="highlight-lines"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><div class="highlight-line">&nbsp;</div><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div><div class="line-numbers" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span 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class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br><span class="line-number">118</span><br><span class="line-number">119</span><br><span class="line-number">120</span><br><span class="line-number">121</span><br><span class="line-number">122</span><br><span class="line-number">123</span><br><span class="line-number">124</span><br><span class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br><span class="line-number">128</span><br><span class="line-number">129</span><br><span class="line-number">130</span><br><span class="line-number">131</span><br><span class="line-number">132</span><br><span class="line-number">133</span><br><span class="line-number">134</span><br><span class="line-number">135</span><br><span class="line-number">136</span><br><span class="line-number">137</span><br><span class="line-number">138</span><br><span class="line-number">139</span><br><span class="line-number">140</span><br><span class="line-number">141</span><br><span class="line-number">142</span><br><span class="line-number">143</span><br><span class="line-number">144</span><br><span class="line-number">145</span><br><span class="line-number">146</span><br><span class="line-number">147</span><br><span class="line-number">148</span><br><span class="line-number">149</span><br><span class="line-number">150</span><br><span class="line-number">151</span><br><span class="line-number">152</span><br></div></div><h2 id="image-minimizer" tabindex="-1"><a class="header-anchor" href="#image-minimizer" aria-hidden="true">#</a> Image Minimizer</h2>
<h3 id="为什么-2" tabindex="-1"><a class="header-anchor" href="#为什么-2" aria-hidden="true">#</a> 为什么</h3>
<p>开发如果项目中引用了较多图片，那么图片体积会比较大，将来请求速度比较慢。</p>
<p>我们可以对图片进行压缩，减少图片体积。</p>
<p><strong>注意：如果项目中图片都是在线链接，那么就不需要了。本地项目静态图片才需要进行压缩。</strong></p>
<h3 id="是什么-2" tabindex="-1"><a class="header-anchor" href="#是什么-2" aria-hidden="true">#</a> 是什么</h3>
<p><code>image-minimizer-webpack-plugin</code>: 用来压缩图片的插件</p>
<h3 id="怎么用-2" tabindex="-1"><a class="header-anchor" href="#怎么用-2" aria-hidden="true">#</a> 怎么用</h3>
<ol>
<li>下载包</li>
</ol>
<div class="language-text ext-text line-numbers-mode"><pre v-pre class="language-text"><code>npm i image-minimizer-webpack-plugin imagemin -D
</code></pre><div class="line-numbers" aria-hidden="true"><span class="line-number">1</span><br></div></div><p>还有剩下包需要下载，有两种模式：</p>
<ul>
<li>无损压缩</li>
</ul>
<div class="language-text ext-text line-numbers-mode"><pre v-pre class="language-text"><code>npm install imagemin-gifsicle imagemin-jpegtran imagemin-optipng imagemin-svgo -D
</code></pre><div class="line-numbers" aria-hidden="true"><span class="line-number">1</span><br></div></div><ul>
<li>有损压缩</li>
</ul>
<div class="language-text ext-text line-numbers-mode"><pre v-pre class="language-text"><code>npm install imagemin-gifsicle imagemin-mozjpeg imagemin-pngquant imagemin-svgo -D
</code></pre><div class="line-numbers" aria-hidden="true"><span class="line-number">1</span><br></div></div><blockquote>
<p><a href="https://baike.baidu.com/item/%E6%97%A0%E6%8D%9F%E3%80%81%E6%9C%89%E6%8D%9F%E5%8E%8B%E7%BC%A9" target="_blank" rel="noopener noreferrer">有损/无损压缩的区别<ExternalLinkIcon/></a></p>
</blockquote>
<ol start="2">
<li>配置</li>
</ol>
<p>我们以无损压缩配置为例：</p>
<div class="language-javascript ext-js line-numbers-mode"><pre v-pre class="language-javascript"><code><span class="token keyword">const</span> os <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"os"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"path"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> ESLintWebpackPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"eslint-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> HtmlWebpackPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"html-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> MiniCssExtractPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"mini-css-extract-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> CssMinimizerPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"css-minimizer-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> TerserPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"terser-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> ImageMinimizerPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"image-minimizer-webpack-plugin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// cpu核数</span>
<span class="token keyword">const</span> threads <span class="token operator">=</span> os<span class="token punctuation">.</span><span class="token function">cpus</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span>

<span class="token comment">// 获取处理样式的Loaders</span>
<span class="token keyword">const</span> <span class="token function-variable function">getStyleLoaders</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">preProcessor</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">[</span>
    MiniCssExtractPlugin<span class="token punctuation">.</span>loader<span class="token punctuation">,</span>
    <span class="token string">"css-loader"</span><span class="token punctuation">,</span>
    <span class="token punctuation">{</span>
      <span class="token literal-property property">loader</span><span class="token operator">:</span> <span class="token string">"postcss-loader"</span><span class="token punctuation">,</span>
      <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">postcssOptions</span><span class="token operator">:</span> <span class="token punctuation">{</span>
          <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>
            <span class="token string">"postcss-preset-env"</span><span class="token punctuation">,</span> <span class="token comment">// 能解决大多数样式兼容性问题</span>
          <span class="token punctuation">]</span><span class="token punctuation">,</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    preProcessor<span class="token punctuation">,</span>
  <span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>Boolean<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
  <span class="token literal-property property">entry</span><span class="token operator">:</span> <span class="token string">"./src/main.js"</span><span class="token punctuation">,</span>
  <span class="token literal-property property">output</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">path</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">"../dist"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment">// 生产模式需要输出</span>
    <span class="token literal-property property">filename</span><span class="token operator">:</span> <span class="token string">"static/js/main.js"</span><span class="token punctuation">,</span> <span class="token comment">// 将 js 文件输出到 static/js 目录中</span>
    <span class="token literal-property property">clean</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  <span class="token literal-property property">module</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">rules</span><span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span>
        <span class="token literal-property property">oneOf</span><span class="token operator">:</span> <span class="token punctuation">[</span>
          <span class="token punctuation">{</span>
            <span class="token comment">// 用来匹配 .css 结尾的文件</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.css$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token comment">// use 数组里面 Loader 执行顺序是从右到左</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token function">getStyleLoaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.less$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token function">getStyleLoaders</span><span class="token punctuation">(</span><span class="token string">"less-loader"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.s[ac]ss$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token function">getStyleLoaders</span><span class="token punctuation">(</span><span class="token string">"sass-loader"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.styl$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token function">getStyleLoaders</span><span class="token punctuation">(</span><span class="token string">"stylus-loader"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.(png|jpe?g|gif|svg)$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">"asset"</span><span class="token punctuation">,</span>
            <span class="token literal-property property">parser</span><span class="token operator">:</span> <span class="token punctuation">{</span>
              <span class="token literal-property property">dataUrlCondition</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                <span class="token literal-property property">maxSize</span><span class="token operator">:</span> <span class="token number">10</span> <span class="token operator">*</span> <span class="token number">1024</span><span class="token punctuation">,</span> <span class="token comment">// 小于10kb的图片会被base64处理</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token literal-property property">generator</span><span class="token operator">:</span> <span class="token punctuation">{</span>
              <span class="token comment">// 将图片文件输出到 static/imgs 目录中</span>
              <span class="token comment">// 将图片文件命名 [hash:8][ext][query]</span>
              <span class="token comment">// [hash:8]: hash值取8位</span>
              <span class="token comment">// [ext]: 使用之前的文件扩展名</span>
              <span class="token comment">// [query]: 添加之前的query参数</span>
              <span class="token literal-property property">filename</span><span class="token operator">:</span> <span class="token string">"static/imgs/[hash:8][ext][query]"</span><span class="token punctuation">,</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.(ttf|woff2?)$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">"asset/resource"</span><span class="token punctuation">,</span>
            <span class="token literal-property property">generator</span><span class="token operator">:</span> <span class="token punctuation">{</span>
              <span class="token literal-property property">filename</span><span class="token operator">:</span> <span class="token string">"static/media/[hash:8][ext][query]"</span><span class="token punctuation">,</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
          <span class="token punctuation">{</span>
            <span class="token literal-property property">test</span><span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.js$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
            <span class="token comment">// exclude: /node_modules/, // 排除node_modules代码不编译</span>
            <span class="token literal-property property">include</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">"../src"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment">// 也可以用包含</span>
            <span class="token literal-property property">use</span><span class="token operator">:</span> <span class="token punctuation">[</span>
              <span class="token punctuation">{</span>
                <span class="token literal-property property">loader</span><span class="token operator">:</span> <span class="token string">"thread-loader"</span><span class="token punctuation">,</span> <span class="token comment">// 开启多进程</span>
                <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                  <span class="token literal-property property">workers</span><span class="token operator">:</span> threads<span class="token punctuation">,</span> <span class="token comment">// 数量</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
              <span class="token punctuation">{</span>
                <span class="token literal-property property">loader</span><span class="token operator">:</span> <span class="token string">"babel-loader"</span><span class="token punctuation">,</span>
                <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                  <span class="token literal-property property">cacheDirectory</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token comment">// 开启babel编译缓存</span>
                  <span class="token literal-property property">cacheCompression</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token comment">// 缓存文件不要压缩</span>
                  <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">"@babel/plugin-transform-runtime"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token comment">// 减少代码体积</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token punctuation">]</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token punctuation">]</span><span class="token punctuation">,</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>
    <span class="token keyword">new</span> <span class="token class-name">ESLintWebpackPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      <span class="token comment">// 指定检查文件的根目录</span>
      <span class="token literal-property property">context</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">"../src"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token literal-property property">exclude</span><span class="token operator">:</span> <span class="token string">"node_modules"</span><span class="token punctuation">,</span> <span class="token comment">// 默认值</span>
      <span class="token literal-property property">cache</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token comment">// 开启缓存</span>
      <span class="token comment">// 缓存目录</span>
      <span class="token literal-property property">cacheLocation</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>
        __dirname<span class="token punctuation">,</span>
        <span class="token string">"../node_modules/.cache/.eslintcache"</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      threads<span class="token punctuation">,</span> <span class="token comment">// 开启多进程</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">HtmlWebpackPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      <span class="token comment">// 以 public/index.html 为模板创建文件</span>
      <span class="token comment">// 新的html文件有两个特点：1. 内容和源文件一致 2. 自动引入打包生成的js等资源</span>
      <span class="token literal-property property">template</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">"../public/index.html"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token comment">// 提取css成单独文件</span>
    <span class="token keyword">new</span> <span class="token class-name">MiniCssExtractPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      <span class="token comment">// 定义输出文件名和目录</span>
      <span class="token literal-property property">filename</span><span class="token operator">:</span> <span class="token string">"static/css/main.css"</span><span class="token punctuation">,</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token comment">// css压缩</span>
    <span class="token comment">// new CssMinimizerPlugin(),</span>
  <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token literal-property property">optimization</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">minimizer</span><span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token comment">// css压缩也可以写到optimization.minimizer里面，效果一样的</span>
      <span class="token keyword">new</span> <span class="token class-name">CssMinimizerPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token comment">// 当生产模式会默认开启TerserPlugin，但是我们需要进行其他配置，就要重新写了</span>
      <span class="token keyword">new</span> <span class="token class-name">TerserPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        <span class="token literal-property property">parallel</span><span class="token operator">:</span> threads<span class="token punctuation">,</span> <span class="token comment">// 开启多进程</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token comment">// 压缩图片</span>
      <span class="token keyword">new</span> <span class="token class-name">ImageMinimizerPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        <span class="token literal-property property">minimizer</span><span class="token operator">:</span> <span class="token punctuation">{</span>
          <span class="token literal-property property">implementation</span><span class="token operator">:</span> ImageMinimizerPlugin<span class="token punctuation">.</span>imageminGenerate<span class="token punctuation">,</span>
          <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>
              <span class="token punctuation">[</span><span class="token string">"gifsicle"</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> <span class="token literal-property property">interlaced</span><span class="token operator">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
              <span class="token punctuation">[</span><span class="token string">"jpegtran"</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> <span class="token literal-property property">progressive</span><span class="token operator">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
              <span class="token punctuation">[</span><span class="token string">"optipng"</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> <span class="token literal-property property">optimizationLevel</span><span class="token operator">:</span> <span class="token number">5</span> <span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
              <span class="token punctuation">[</span>
                <span class="token string">"svgo"</span><span class="token punctuation">,</span>
                <span class="token punctuation">{</span>
                  <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>
                    <span class="token string">"preset-default"</span><span class="token punctuation">,</span>
                    <span class="token string">"prefixIds"</span><span class="token punctuation">,</span>
                    <span class="token punctuation">{</span>
                      <span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">"sortAttrs"</span><span class="token punctuation">,</span>
                      <span class="token literal-property property">params</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                        <span class="token literal-property property">xmlnsOrder</span><span class="token operator">:</span> <span class="token string">"alphabetical"</span><span class="token punctuation">,</span>
                      <span class="token punctuation">}</span><span class="token punctuation">,</span>
                    <span class="token punctuation">}</span><span class="token punctuation">,</span>
                  <span class="token punctuation">]</span><span class="token punctuation">,</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span>
              <span class="token punctuation">]</span><span class="token punctuation">,</span>
            <span class="token punctuation">]</span><span class="token punctuation">,</span>
          <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  <span class="token comment">// devServer: {</span>
  <span class="token comment">//   host: "localhost", // 启动服务器域名</span>
  <span class="token comment">//   port: "3000", // 启动服务器端口号</span>
  <span class="token comment">//   open: true, // 是否自动打开浏览器</span>
  <span class="token comment">// },</span>
  <span class="token literal-property property">mode</span><span class="token operator">:</span> <span class="token string">"production"</span><span class="token punctuation">,</span>
  <span class="token literal-property property">devtool</span><span class="token operator">:</span> <span class="token string">"source-map"</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre><div class="highlight-lines"><br><br><br><br><br><br><br><div class="highlight-line">&nbsp;</div><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><div class="highlight-line">&nbsp;</div><div class="highlight-line">&nbsp;</div><div class="highlight-line">&nbsp;</div><div class="highlight-line">&nbsp;</div><div class="highlight-line">&nbsp;</div><div class="highlight-line">&nbsp;</div><div class="highlight-line">&nbsp;</div><div class="highlight-line">&nbsp;</div><div 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class="line-number">178</span><br><span class="line-number">179</span><br><span class="line-number">180</span><br><span class="line-number">181</span><br></div></div><ol start="3">
<li>打包时会出现报错：</li>
</ol>
<div class="language-text ext-text line-numbers-mode"><pre v-pre class="language-text"><code>Error: Error with 'src\images\1.jpeg': '"C:\Users\86176\Desktop\webpack\webpack_code\node_modules\jpegtran-bin\vendor\jpegtran.exe"'
Error with 'src\images\3.gif': spawn C:\Users\86176\Desktop\webpack\webpack_code\node_modules\optipng-bin\vendor\optipng.exe ENOENT
</code></pre><div class="line-numbers" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>我们需要安装两个文件到 node_modules 中才能解决, 文件可以从课件中找到：</p>
<ul>
<li>jpegtran.exe</li>
</ul>
<p>需要复制到 <code>node_modules\jpegtran-bin\vendor</code> 下面</p>
<blockquote>
<p><a href="http://jpegclub.org/jpegtran/" target="_blank" rel="noopener noreferrer">jpegtran 官网地址<ExternalLinkIcon/></a></p>
</blockquote>
<ul>
<li>optipng.exe</li>
</ul>
<p>需要复制到 <code>node_modules\optipng-bin\vendor</code> 下面</p>
<blockquote>
<p><a href="http://optipng.sourceforge.net/" target="_blank" rel="noopener noreferrer">OptiPNG 官网地址<ExternalLinkIcon/></a></p>
</blockquote>
</template>