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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 current">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">空白字符控制</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/whitespace-control.md" class="article-edit-link" title="改进这篇文档"><i class="icon-pencil"></i></a>
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<p>为了让源代码缩进好看，我们会加很多空白字符比如把不会产生输出的标签也单独一行。LiquidJS 提供了空白字符控制机制，可以避免这些多余的空白字符输出到 HTML 中。</p>
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<h2 id="通过标记的方式" class="article-heading"><a href="#通过标记的方式" class="headerlink" title="通过标记的方式"></a>通过标记的方式<a class="article-anchor" href="#通过标记的方式" aria-hidden="true"></a></h2><p>默认所有标签和输出的行，都会在行尾产生一个换行（<code>\n</code>），如果有缩进的话还会产生很多前导空格。例如：</p>
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<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> author <span class="token operator">=</span> <span class="token string">"harttle"</span> <span class="token delimiter punctuation">%}</span></span>
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<span class="token liquid language-liquid"><span class="token delimiter punctuation">{{</span> author <span class="token delimiter punctuation">}}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>
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<p>将会输出（注意前面的空行）：</p>
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<pre class="line-numbers language-none"><code class="language-none">
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harttle<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>
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<p>可以在标签和输出的标记里面加横线（<code>{{-`, `-}}`, `{%-</code>, <code>-%}</code>）来移除左侧/右侧的空白。例如：</p>
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<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> <span class="token keyword">assign</span> author <span class="token operator">=</span> <span class="token string">"harttle"</span> <span class="token delimiter punctuation">-%}</span></span>
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<span class="token liquid language-liquid"><span class="token delimiter punctuation">{{</span> author <span class="token delimiter punctuation">}}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>
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<p>将会输出：</p>
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<pre class="line-numbers language-none"><code class="language-none">harttle<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
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<p>这个例子中 <code>-%}</code> 移除了 <code>assign</code> 标签右侧的空白。</p>
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<h2 id="通过选项" class="article-heading"><a href="#通过选项" class="headerlink" title="通过选项"></a>通过选项<a class="article-anchor" href="#通过选项" aria-hidden="true"></a></h2><p>此外 LiquidJS 还提供了一系列选项来帮助扫代码式地移除空白：</p>
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<ul>
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<li><code>trimTagLeft</code></li>
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<li><code>trimTagRight</code></li>
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<li><code>trimValueRight</code></li>
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<li><code>trimValueRight</code></li>
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</ul>
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<p><a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs">LiquidJS</a> 默认 <strong>不会</strong> 移除任何空白字符，也就是说上面几个选项的默认值都为 <code>false</code>。这几个选项的详情请参考 <a href="/api/interfaces/LiquidOptions.html">LiquidJS 选项</a>。</p>
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<h2 id="贪婪模式" class="article-heading"><a href="#贪婪模式" class="headerlink" title="贪婪模式"></a>贪婪模式<a class="article-anchor" href="#贪婪模式" aria-hidden="true"></a></h2><p>上述几个设置默认情况下会跨越换行（<code>\n</code>），如果你希望保留上下空行可以把 <a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs">greedy 选项</a> 关掉，这样遇到 <code>\n</code> 就会停止。为了和 <a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/Shopify/liquid">shopify/liquid</a> 一致该选项默认是打开的。</p>
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<time class="article-footer-updated" datetime="2023-06-03T18:24:33.900Z" itemprop="dateModified">上次更新：2023-06-03</time>
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<a href="sync-and-async.html" class="article-footer-prev" title="同步和异步"><i class="icon-chevron-left"></i><span>上一页</span></a><a href="plugins.html" class="article-footer-next" title="插件"><span>下一页</span><i class="icon-chevron-right"></i></a>
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<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E9%80%9A%E8%BF%87%E6%A0%87%E8%AE%B0%E7%9A%84%E6%96%B9%E5%BC%8F"><span class="toc-text">通过标记的方式</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E9%80%9A%E8%BF%87%E9%80%89%E9%A1%B9"><span class="toc-text">通过选项</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%B4%AA%E5%A9%AA%E6%A8%A1%E5%BC%8F"><span class="toc-text">贪婪模式</span></a></li></ol>
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