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<strong class="sidebar-title">开始使用</strong><a href="intro-to-liquid.html" class="sidebar-link">Liquid 简介</a><a href="setup.html" class="sidebar-link">安装</a><a href="options.html" class="sidebar-link">选项</a><a href="render-file.html" class="sidebar-link">文件渲染</a><a href="partials-and-layouts.html" class="sidebar-link">引用/继承</a><a href="use-in-expressjs.html" class="sidebar-link current">Express.js 中使用</a><strong class="sidebar-title">高级主题</strong><a href="caching.html" class="sidebar-link">缓存</a><a href="register-filters-tags.html" class="sidebar-link">注册标签/过滤器</a><a href="whitespace-control.html" class="sidebar-link">换行和缩进</a><a href="plugins.html" class="sidebar-link">插件</a><a href="operators.html" class="sidebar-link">运算符</a><a href="truthy-and-falsy.html" class="sidebar-link">真和假</a><strong class="sidebar-title">其他</strong><a href="migrate-to-9.html" class="sidebar-link">迁移到 LiquidJS 9</a><a href="changelog.html" class="sidebar-link">更新日志</a><a href="differences.html" class="sidebar-link">与 Shopify/liquid 的不同</a><a href="contribution-guidelines.html" class="sidebar-link">贡献指南</a>
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<h1 class="article-title" itemprop="name">在 Express.js 里使用</h1>
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<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs/edit/master/docs/source/zh-cn/tutorials/use-in-expressjs.md" class="article-edit-link" title="改进这篇文档"><i class="icon-pencil"></i></a>
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<p>LiquidJS 可以用来作为 <a target="_blank" rel="noopener external nofollow noreferrer" href="https://expressjs.com/en/resources/template-engines.html">Express 的模板引擎</a>。可以把 Liquid 设置到 <a target="_blank" rel="noopener external nofollow noreferrer" href="http://expressjs.com/en/guide/using-template-engines.html">view engine</a> 选项上即可：</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">var</span> { Liquid } = <span class="built_in">require</span>(<span class="string">'liquidjs'</span>);</span><br><span class="line"><span class="keyword">var</span> engine = <span class="keyword">new</span> Liquid();</span><br><span class="line"></span><br><span class="line"><span class="comment">// 注册为 liquid 文件的模板引擎</span></span><br><span class="line">app.engine(<span class="string">'liquid'</span>, engine.express()); </span><br><span class="line">app.set(<span class="string">'views'</span>, <span class="string">'./views'</span>); <span class="comment">// 指定模板目录</span></span><br><span class="line">app.set(<span class="string">'view engine'</span>, <span class="string">'liquid'</span>); <span class="comment">// 把 liquid 文件设为默认模板</span></span><br></pre></td></tr></table></figure>
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<blockquote class="note info"><strong class="note-title">示例</strong><p>这是一个在 Express.js 中使用 LiquidJS 的例子：<a href="https://github.com/harttle/liquidjs/blob/master/demo/express/" rel="external nofollow noreferrer" target="_blank">liquidjs/demo/express/</a>.</p>
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</blockquote>
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<h2 id="模板查找" class="article-heading"><a href="#模板查找" class="headerlink" title="模板查找"></a>模板查找<a class="article-anchor" href="#模板查找" aria-hidden="true"></a></h2><p>LiquidJS 仍然会去 <a href="../../api/interfaces/liquid_options_.liquidoptions.html#Optional-root">root</a> 指定的目录查找（参考 <a href="./render-a-file.html">Render A Template File</a>），也会去 Express.js 的 <a target="_blank" rel="noopener external nofollow noreferrer" href="http://expressjs.com/en/guide/using-template-engines.html"><code>views</code></a> 选项指定的目录里（上述例子中是 <code>./views</code>）去查找。例如你有这样的目录结构：</p>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">.</span><br><span class="line">├── views1/</span><br><span class="line">│ └── hello.liquid</span><br><span class="line">└── views2/</span><br><span class="line"> └── world.liquid</span><br></pre></td></tr></table></figure>
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<p>LiquidJS 的模板 root 设置到了 <code>views1</code>，Express.js 的 views 设置到了 <code>views2</code>：</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">var</span> { Liquid } = <span class="built_in">require</span>(<span class="string">'liquidjs'</span>);</span><br><span class="line"><span class="keyword">var</span> engine = <span class="keyword">new</span> Liquid({</span><br><span class="line"> <span class="attr">root</span>: <span class="string">'./views1/'</span></span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">app.engine(<span class="string">'liquid'</span>, engine.express()); </span><br><span class="line">app.set(<span class="string">'views'</span>, <span class="string">'./views2'</span>);</span><br><span class="line">app.set(<span class="string">'view engine'</span>, <span class="string">'liquid'</span>);</span><br></pre></td></tr></table></figure>
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<p><code>hello.liquid</code> 和 <code>world.liquid</code> 两个文件都可以找到并且成功渲染：</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">res.render(<span class="string">'hello'</span>)</span><br><span class="line">res.render(<span class="string">'world'</span>)</span><br></pre></td></tr></table></figure>
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<h2 id="缓存" class="article-heading"><a href="#缓存" class="headerlink" title="缓存"></a>缓存<a class="article-anchor" href="#缓存" aria-hidden="true"></a></h2><p>直接把 <a href="../../api/interfaces/liquid_options_.liquidoptions.html#Optional-cache">cache 选项</a> 设为 <code>true</code> 即可开启模板缓存，参考 <a href="./caching.html">缓存</a> 一文。推荐在生产环境中开启缓存，可以用如下代码：</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">var</span> { Liquid } = <span class="built_in">require</span>(<span class="string">'liquidjs'</span>);</span><br><span class="line"><span class="keyword">var</span> engine = <span class="keyword">new</span> Liquid({</span><br><span class="line"> <span class="attr">cache</span>: process.env.NODE_ENV === <span class="string">'production'</span></span><br><span class="line">});</span><br></pre></td></tr></table></figure>
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<p><code>cache</code> 还可以是一个数字表示最大缓存的模板数量，也可以是一个自定义的缓存实现，详情请参考 <a href="../../api/interfaces/liquid_options_.liquidoptions.html#Optional-cache">cache 选项</a>。</p>
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<time class="article-footer-updated" datetime="2021-10-16T14:39:16.560Z" itemprop="dateModified">上次更新：2021-10-16</time>
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<strong class="mobile-nav-title">开始使用</strong><a href="intro-to-liquid.html" class="mobile-nav-link">Liquid 简介</a><a href="setup.html" class="mobile-nav-link">安装</a><a href="options.html" class="mobile-nav-link">选项</a><a href="render-file.html" class="mobile-nav-link">文件渲染</a><a href="partials-and-layouts.html" class="mobile-nav-link">引用/继承</a><a href="use-in-expressjs.html" class="mobile-nav-link current">Express.js 中使用</a><strong class="mobile-nav-title">高级主题</strong><a href="caching.html" class="mobile-nav-link">缓存</a><a href="register-filters-tags.html" class="mobile-nav-link">注册标签/过滤器</a><a href="whitespace-control.html" class="mobile-nav-link">换行和缩进</a><a href="plugins.html" class="mobile-nav-link">插件</a><a href="operators.html" class="mobile-nav-link">运算符</a><a href="truthy-and-falsy.html" class="mobile-nav-link">真和假</a><strong class="mobile-nav-title">其他</strong><a href="migrate-to-9.html" class="mobile-nav-link">迁移到 LiquidJS 9</a><a href="changelog.html" class="mobile-nav-link">更新日志</a><a href="differences.html" class="mobile-nav-link">与 Shopify/liquid 的不同</a><a href="contribution-guidelines.html" class="mobile-nav-link">贡献指南</a>
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