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<li><a href="#安装工具">安装工具</a></li>
<li><a href="#使用-npm-脚本">使用 npm 脚本</a></li>
<li><a href="#sass">Sass</a></li>
<li><a href="#autoprefixer">Autoprefixer</a></li>
<li><a href="#在本地启动文档网站">在本地启动文档网站</a></li>
<li><a href="#故障排除">故障排除</a></li>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
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<body>
<main class="col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main">
<div class="d-md-flex flex-md-row-reverse align-items-center justify-content-between">
<a class="btn btn-sm btn-bd-light my-2 my-md-0"
href="https://github.com/twbs/bootstrap/blob/v4.6.2/site/content/docs/getting-started/build-tools.md"
title="View and edit this file on GitHub" target="_blank" rel="noopener">View on GitHub</a>
<h1 class="bd-title" id="content">构建工具</h1>
</div>
<p class="bd-lead">了解如何使用 Bootstrap 自带的 npm 脚本来构建文档、编译源码、运行测试等。</p>
<h2 id="安装工具"><span class="bd-content-title">安装工具<a class="anchorjs-link " aria-label="Anchor"
data-anchorjs-icon="#" href="#安装工具" style="padding-left: 0.375em;"></a></span></h2>
<p>Bootstrap 的构建系统由 <a href="https://docs.npmjs.com/misc/scripts/">npm 脚本</a> 组成的。 其自带的 <a
href="https://github.com/twbs/bootstrap/blob/v4.6.2/package.json">package.json</a> 文件提供了便捷的途径来编译代码、运行测试等。
</p>
<p>无论是使用 Bootstrap 自带的构建系统还是在本地启动文档网站，都需要下载 Bootstrap 源码并安装 Node。请按照以下步骤操作并搭建本地运行环境：</p>
<ol>
<li><a href="https://nodejs.org/en/download/">下载并安装 Node.js</a>，其自带了我们用于管理依赖项的工具。</li>
<li><a href="https://github.com/twbs/bootstrap/archive/v4.6.2.zip">下载 Bootstrap 的源码</a> 或克隆 <a
href="https://github.com/twbs/bootstrap">Bootstrap 的源码仓库</a> 到本地。</li>
<li>进入源码的根目录 <code>/bootstrap</code> 并运行 <code>npm install</code> 以安装 <a
href="https://github.com/twbs/bootstrap/blob/v4.6.2/package.json">package.json</a> 文件中列出的所有依赖项到本地。</li>
</ol>
<p>上述步骤完成后，你就可以运行 Bootstrap 所提供的各个命令了。</p>
<h2 id="使用-npm-脚本"><span class="bd-content-title">使用 npm 脚本<a class="anchorjs-link " aria-label="Anchor"
data-anchorjs-icon="#" href="#使用-npm-脚本" style="padding-left: 0.375em;"></a></span></h2>
<p>Bootstrap 自带的 <a href="https://github.com/twbs/bootstrap/blob/v4.6.2/package.json">package.json</a>
文件提供了如下所列出的命令：</p>
<table>
<thead>
<tr>
<th>命令</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>npm run dist</code></td>
<td><code>npm run dist</code> 命令用于创建 <code>/dist/</code> 目录并将编译后的文件放置于此目录中。<strong>用到了 <a
href="https://sass-lang.com/">Sass</a>、<a
href="https://github.com/postcss/autoprefixer">Autoprefixer</a> 和 <a
href="https://github.com/terser/terser">terser</a> 工具。</strong></td>
</tr>
<tr>
<td><code>npm test</code></td>
<td>运行 <code>npm run dist</code> 命令之后在本地运行测试程序</td>
</tr>
<tr>
<td><code>npm run docs-serve</code></td>
<td>在本地构建并启动文档网站。</td>
</tr>
</tbody>
</table>
<p>运行 <code>npm run</code> 列出所有可用的 npm 命令或脚本。to see all the npm scripts.</p>
<div class="bd-callout bd-callout-info">
<strong>利用 npm 和我们提供的模板项目快速上手 Bootstrap！</strong> 请前往 <a
href="https://github.com/twbs/bootstrap-npm-starter">twbs/bootstrap-npm-starter</a> 模板仓库，了解如何你自己的 npm
项目中构建和定制 Bootstrap。包括 Sass 编译器、Autoprefixer、Stylelint、PurgeCSS 以及 Bootstrap 图标库。
</div>
<h2 id="sass"><span class="bd-content-title">Sass<a class="anchorjs-link " aria-label="Anchor"
data-anchorjs-icon="#" href="#sass" style="padding-left: 0.375em;"></a></span></h2>
<p>Bootstrap v4 版本使用 <a href="https://github.com/sass/node-sass">Node Sass</a> 工具将 Sass 源码文件编译为 CSS
文件（已包含在我们的构建流程中了）。如果你需要自己编译 Sass 源码的话，为了保证最终生成的 CSS 与官方保持一致，你所使用的 Sass 编译器至少要支持 Node Sass
所支持的所有功能。特别需要注意的是，自 2020 年 10 月 26 日起，LibSass 及构建在 LibSass 上的所有软件包（包括 Node Sass）都已被 Sass 官方标记为 <a
href="https://sass-lang.com/blog/libsass-is-deprecated">不推荐使用</a> 了。</p>
<p>如果你需要新的 Sass 功能或与新的 CSS 标准相兼容，<a href="https://sass-lang.com/dart-sass">Dart Sass</a> 现在是 Sass 的主要实现，并支持与
Node Sass 完全兼容的 JavaScript API （有几个例外，请去 Dart Sass 的 <a href="https://github.com/sass/dart-sass">GitHub
page</a> 页面上查看）。</p>
<p>我们将 Sass 编译器对浮点数的舍入精度提高到了 6 （在 Node Sass 中默认是 5 ），以避免浏览器的舍入问题。如果你使用的是 Dart Sass，则无需进行调整，因为该编译器设置的舍入精度为
10，并且出于执行效率的考虑，不允许对此数值进行调整。</p>
<h2 id="autoprefixer"><span class="bd-content-title">Autoprefixer<a class="anchorjs-link " aria-label="Anchor"
data-anchorjs-icon="#" href="#autoprefixer" style="padding-left: 0.375em;"></a></span></h2>
<p>Bootstrap 使用 <a href="https://github.com/postcss/autoprefixer">Autoprefixer</a>
（已包含在我们的构建流程中了）工具在构建时自动将特定于厂商的属性前缀添加到某些 CSS 属性前。对于 CSS 的关键部分，此工具可以让我们只需要编写一次然后由自动添加，并且避免了像 Bootstrap v3
版本中那样手动添加带有特定于厂商前缀的 CSS 属性，这样就节省我们的时间并减少了代码量。</p>
<p>我们将需要 Autoprefixer 支持的浏览器列表保存在一个单独的文件中，并提交到 GitHub 仓库中进行管理。有关详细信息，请参见 <a
href="https://github.com/twbs/bootstrap/blob/v4.6.2/.browserslistrc">.browserslistrc</a>。</p>
<h2 id="在本地启动文档网站"><span class="bd-content-title">在本地启动文档网站<a class="anchorjs-link " aria-label="Anchor"
data-anchorjs-icon="#" href="#在本地启动文档网站" style="padding-left: 0.375em;"></a></span></h2>
<p>在本地启动文档网站需要用到 Hugo 工具，它是通过 <a href="https://www.npmjs.com/package/hugo-bin">hugo-bin</a> 这个 npm
软件包安装到本地的。Hugo 是一个快速且可扩展的静态站点生成器，它为我们提供的基本功能包括：文件包含、编译 Markdown 文件、模板等。以下是 Hugo 的用法：</p>
<ol>
<li>参照上面的 <a href="#tooling-setup">安装工具</a> 章节的说明安装所有依赖项。</li>
<li>进入根目录 <code>/bootstrap</code>，运行 <code>npm run docs-serve</code> 命令。</li>
<li>在浏览器中输入 <code>http://localhost:9001/</code> 网址，然后就能看到文档网站的内容了。</li>
</ol>
<p>如需了解更多关于 Hugo 的信息，请参阅其 <a href="https://gohugo.io/documentation/">文档</a>。</p>
<h2 id="故障排除"><span class="bd-content-title">故障排除<a class="anchorjs-link " aria-label="Anchor"
data-anchorjs-icon="#" href="#故障排除" style="padding-left: 0.375em;"></a></span></h2>
<p>如果你在安装依赖项时遇到了问题，请卸载所有先前安装的依赖项及其各个版本（包括全局和本地）。然后，重新运行 <code>npm install</code>。</p>
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