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<div id="content-inner">
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<aside id="sidebar" role="navigation">
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<div class="inner">
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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">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="access-scope-in-filters.html" class="sidebar-link">过滤器里访问上下文</a><a href="parse-parameters.html" class="sidebar-link">参数解析</a><a href="sync-and-async.html" class="sidebar-link">同步和异步</a><a href="whitespace-control.html" class="sidebar-link">换行和缩进</a><a href="plugins.html" class="sidebar-link current">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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<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">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="access-scope-in-filters.html" class="sidebar-link">过滤器里访问上下文</a><a href="parse-parameters.html" class="sidebar-link">参数解析</a><a href="render-tag-content.html" class="sidebar-link">渲染标签内容</a><a href="sync-and-async.html" class="sidebar-link">同步和异步</a><a href="whitespace-control.html" class="sidebar-link">换行和缩进</a><a href="plugins.html" class="sidebar-link current">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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</div>
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</aside>
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<article class="article-container" itemscope itemtype="http://schema.org/Article">
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<p>一组标签和过滤器可以封装为一个 <strong>插件</strong>，通常发包到 NPM 来方便使用。本文介绍如何创建和使用插件。</p>
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<h2 id="编写插件" class="article-heading"><a href="#编写插件" class="headerlink" title="编写插件"></a>编写插件<a class="article-anchor" href="#编写插件" aria-hidden="true"></a></h2><p>LiquidJS 插件就是一个简单的函数，它的第一个参数是 <a href="../../api/classes/liquid_.liquid.html">Liquid 类</a>，其中的 <code>this</code> 是它被注册到的 Liquid 实例。可以通过 <code>this</code> 来调用 Liquid API，比如 <a href="./register-filters-tags.html">注册标签和过滤器</a>。</p>
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<p>现在我们来写一个插件并在其中注册一个过滤器，来把输入字符串转换为大写：</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Inside the plugin function, `this` refers to the Liquid instance.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param </span>Liquid: provides facilities to implement tags and filters.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="built_in">module</span>.exports = <span class="function"><span class="keyword">function</span> (<span class="params">Liquid</span>) </span>{</span><br><span class="line"> <span class="built_in">this</span>.registerFilter(<span class="string">'upup'</span>, <span class="function"><span class="params">x</span> =></span> x.toUpperCase());</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">/**
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* Inside the plugin function, `this` refers to the Liquid instance.
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*
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* @param Liquid: provides facilities to implement tags and filters.
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*/</span>
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module<span class="token punctuation">.</span><span class="token function-variable function">exports</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">Liquid</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">registerFilter</span><span class="token punctuation">(</span><span class="token string">'upup'</span><span class="token punctuation">,</span> <span class="token parameter">x</span> <span class="token operator">=></span> x<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>把上述代码保存为 <code>upup.js</code>。</p>
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<h2 id="使用插件" class="article-heading"><a href="#使用插件" class="headerlink" title="使用插件"></a>使用插件<a class="article-anchor" href="#使用插件" aria-hidden="true"></a></h2><p>把插件传递给 <code>.plugin()</code> 方法即可注册插件，例如：</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">const</span> engine = <span class="keyword">new</span> Liquid()</span><br><span class="line"></span><br><span class="line">engine.plugin(<span class="built_in">require</span>(<span class="string">'./upup.js'</span>));</span><br><span class="line">engine.parseAndRender(<span class="string">'{{ "foo" | upup }}'</span>).then(<span class="built_in">console</span>.log)</span><br></pre></td></tr></table></figure>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">const</span> engine <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Liquid</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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engine<span class="token punctuation">.</span><span class="token function">plugin</span><span class="token punctuation">(</span><span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'./upup.js'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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engine<span class="token punctuation">.</span><span class="token function">parseAndRender</span><span class="token punctuation">(</span><span class="token string">'{{ "foo" | upup }}'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>console<span class="token punctuation">.</span>log<span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
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<p>上述代码将会输出 <code>"FOO"</code>。</p>
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<h2 id="插件列表" class="article-heading"><a href="#插件列表" class="headerlink" title="插件列表"></a>插件列表<a class="article-anchor" href="#插件列表" aria-hidden="true"></a></h2><p>由于本仓库只包含 <a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/Shopify/liquid/">Shopify/liquid</a> 核心仓库的标签和插件（参考 <a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs#differences-and-limitations">https://github.com/harttle/liquidjs#differences-and-limitations</a>），Shopify 平台上特有的插件只能通过插件来使用。</p>
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</div>
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<footer class="article-footer">
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<time class="article-footer-updated" datetime="2022-01-22T16:03:03.368Z" itemprop="dateModified">上次更新：2022-01-22</time>
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<time class="article-footer-updated" datetime="2022-01-23T06:25:32.650Z" itemprop="dateModified">上次更新：2022-01-23</time>
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<a href="whitespace-control.html" class="article-footer-prev" title="换行和缩进"><i class="icon-chevron-left"></i><span>上一页</span></a><a href="operators.html" class="article-footer-next" title="运算符"><span>下一页</span><i class="icon-chevron-right"></i></a>
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</footer>
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</div>
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</ul>
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<div class="mobile-sidebar-list">
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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">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="access-scope-in-filters.html" class="mobile-nav-link">过滤器里访问上下文</a><a href="parse-parameters.html" class="mobile-nav-link">参数解析</a><a href="sync-and-async.html" class="mobile-nav-link">同步和异步</a><a href="whitespace-control.html" class="mobile-nav-link">换行和缩进</a><a href="plugins.html" class="mobile-nav-link current">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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<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">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="access-scope-in-filters.html" class="mobile-nav-link">过滤器里访问上下文</a><a href="parse-parameters.html" class="mobile-nav-link">参数解析</a><a href="render-tag-content.html" class="mobile-nav-link">渲染标签内容</a><a href="sync-and-async.html" class="mobile-nav-link">同步和异步</a><a href="whitespace-control.html" class="mobile-nav-link">换行和缩进</a><a href="plugins.html" class="mobile-nav-link current">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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</div>
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</div>
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