mirror of
https://github.com/harttle/liquidjs.git
synced 2026-09-15 12:20:40 -07:00
214 lines
18 KiB
HTML
214 lines
18 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="zh-cn">
|
|
<head prefix="og: https://ogp.me/ns#">
|
|
<meta charset="utf-8">
|
|
<title>运算符 | LiquidJS</title>
|
|
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
|
<meta name="description" content="LiquidJS is a simple, expressive and safe Shopify / GitHub Pages compatible template engine in pure JavaScript.">
|
|
<link rel="dns-prefetch" href="https://cdn.jsdelivr.net/">
|
|
<link rel="manifest" href="/zh-cn/manifest.json">
|
|
<!-- Canonical links -->
|
|
<link rel="canonical" href="https://liquidjs.com/zh-cn/tutorials/operators.html">
|
|
<!-- Alternative links -->
|
|
|
|
|
|
<link rel="alternative" hreflang="en" href="https://liquidjs.com/zh-cn/tutorials/operators">
|
|
|
|
<link rel="alternative" hreflang="zh-cn" href="https://liquidjs.com/zh-cn/zh-cn/tutorials/operators">
|
|
|
|
|
|
<!-- Icon -->
|
|
<link rel="apple-touch-icon" sizes="57x57" href="../../icon/apple-touch-icon-57x57.png">
|
|
<link rel="apple-touch-icon" sizes="114x114" href="../../icon/apple-touch-icon-114x114.png">
|
|
<link rel="apple-touch-icon" sizes="72x72" href="../../icon/apple-touch-icon-72x72.png">
|
|
<link rel="apple-touch-icon" sizes="144x144" href="../../icon/apple-touch-icon-144x144.png">
|
|
<link rel="apple-touch-icon" sizes="60x60" href="../../icon/apple-touch-icon-60x60.png">
|
|
<link rel="apple-touch-icon" sizes="120x120" href="../../icon/apple-touch-icon-120x120.png">
|
|
<link rel="apple-touch-icon" sizes="76x76" href="../../icon/apple-touch-icon-76x76.png">
|
|
<link rel="apple-touch-icon" sizes="152x152" href="../../icon/apple-touch-icon-152x152.png">
|
|
<link rel="icon" type="image/png" href="../../icon/favicon-196x196.png" sizes="196x196">
|
|
<link rel="icon" type="image/png" href="../../icon/favicon-160x160.png" sizes="160x160">
|
|
<link rel="icon" type="image/png" href="../../icon/favicon-96x96.png" sizes="96x96">
|
|
<link rel="icon" type="image/png" href="../../icon/favicon-16x16.png" sizes="16x16">
|
|
<link rel="icon" type="image/png" href="../../icon/favicon-32x32.png" sizes="32x32">
|
|
<meta name="msapplication-TileColor" content="#2f83cd">
|
|
<meta name="msapplication-TileImage" content="../../icon/mstile-144x144.png">
|
|
|
|
<link rel="stylesheet" href="../../css/navy.css">
|
|
|
|
<link rel="alternate" href="../../atom.xml" title="LiquidJS" type="application/atom+xml">
|
|
<meta name="generator" content="Hexo 7.3.0"></head>
|
|
|
|
<body>
|
|
<div id="container">
|
|
<header id="header" class="wrapper">
|
|
<div id="header-inner" class="inner">
|
|
<h1 id="logo-wrap">
|
|
<a href="/zh-cn/" id="logo">LiquidJS</a>
|
|
</h1>
|
|
<nav id="main-nav">
|
|
<a href="intro-to-liquid.html" class="main-nav-link">教程</a><a href="../tags/overview.html" class="main-nav-link">标签</a><a href="../filters/overview.html" class="main-nav-link">过滤器</a><a href="../playground.html" class="main-nav-link">演示</a><a href="../../api/classes/Liquid.html" class="main-nav-link">API</a>
|
|
<div id="search-input-wrap">
|
|
<i id="search-input-icon" class="icon-search"></i>
|
|
<input type="search" id="search-input" placeholder="搜索...">
|
|
</div>
|
|
</nav>
|
|
<div class="main-nav-link icon-nav-link">
|
|
<label><i class="icon-network"></i> <span class="icon-nav-title">简体中文</span></label>
|
|
<select id="lang-select" data-canonical="tutorials/operators.html">
|
|
|
|
<option value="en">English</option>
|
|
|
|
<option value="zh-cn" selected>简体中文</option>
|
|
|
|
</select>
|
|
</div>
|
|
<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs" class="main-nav-link icon-nav-link"><i class="icon-github"></i> <span class="icon-nav-title">GitHub</span></a>
|
|
<a id="mobile-nav-toggle">
|
|
<span class="mobile-nav-toggle-bar"></span>
|
|
<span class="mobile-nav-toggle-bar"></span>
|
|
<span class="mobile-nav-toggle-bar"></span>
|
|
</a>
|
|
</div>
|
|
</header>
|
|
|
|
<div id="content-wrap">
|
|
<div id="content" class="wrapper">
|
|
<div id="content-inner">
|
|
<aside id="sidebar" role="navigation">
|
|
<div class="inner">
|
|
<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="escaping.html" class="sidebar-link">转义</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="drops.html" class="sidebar-link">Liquid Drop</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">插件</a><a href="operators.html" class="sidebar-link current">运算符</a><a href="truthy-and-falsy.html" class="sidebar-link">真和假</a><a href="dos.html" class="sidebar-link">DoS</a><a href="static-analysis.html" class="sidebar-link">静态分析</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>
|
|
</div>
|
|
</aside>
|
|
<article class="article-container" itemscope itemtype="https://schema.org/Article">
|
|
<div class="article-inner">
|
|
<div class="article">
|
|
<div class="inner">
|
|
<header class="article-header">
|
|
<h1 class="article-title" itemprop="name">运算符</h1>
|
|
|
|
<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs/edit/master/docs/source/zh-cn/tutorials/operators.md" class="article-edit-link" title="改进这篇文档"><i class="icon-pencil"></i></a>
|
|
|
|
</header>
|
|
<div class="article-content" itemprop="articleBody">
|
|
<p>LiquidJS 运算符非常简单也很特别，只支持两类运算符：</p>
|
|
<ul>
|
|
<li>比较运算符：<code>==</code>, <code>!=</code>, <code>></code>, <code><</code>, <code>>=</code>, <code><=</code></li>
|
|
<li>逻辑运算符：<code>not</code>, <code>or</code>, <code>and</code>, <code>contains</code></li>
|
|
</ul>
|
|
<p>因此普通的数学运算是不支持的，比如 <code>{{a + b}}</code>。它的替代方案是过滤器 <code>{{ a | plus: b}}</code>。事实上 <code>+</code> 在 LiquidJS 中是一个合法的变量名。</p>
|
|
<h2 id="逻辑运算符" class="article-heading"><a href="#逻辑运算符" class="headerlink" title="逻辑运算符"></a>逻辑运算符<a class="article-anchor" href="#逻辑运算符" aria-hidden="true"></a></h2><h3 id="not" class="article-heading"><a href="#not" class="headerlink" title="not"></a>not<a class="article-anchor" href="#not" aria-hidden="true"></a></h3><p>对条件取反。如果条件为假则返回 <code>true</code>，如果条件为真则返回 <code>false</code>。</p>
|
|
<p>输入</p>
|
|
<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">if</span> not user<span class="token punctuation">.</span>active <span class="token delimiter punctuation">%}</span></span>
|
|
用户未激活
|
|
<span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> <span class="token keyword">endif</span> <span class="token delimiter punctuation">%}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
|
|
|
|
<h3 id="and" class="article-heading"><a href="#and" class="headerlink" title="and"></a>and<a class="article-anchor" href="#and" aria-hidden="true"></a></h3><p>当两个条件都为真时返回 <code>true</code>。</p>
|
|
<p>输入</p>
|
|
<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">if</span> user<span class="token punctuation">.</span>age <span class="token operator">>=</span> <span class="token number">18</span> <span class="token operator">and</span> user<span class="token punctuation">.</span>verified <span class="token delimiter punctuation">%}</span></span>
|
|
允许访问
|
|
<span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> <span class="token keyword">endif</span> <span class="token delimiter punctuation">%}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
|
|
|
|
<h3 id="or" class="article-heading"><a href="#or" class="headerlink" title="or"></a>or<a class="article-anchor" href="#or" aria-hidden="true"></a></h3><p>当至少一个条件为真时返回 <code>true</code>。</p>
|
|
<p>输入</p>
|
|
<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">if</span> user<span class="token punctuation">.</span>isAdmin <span class="token operator">or</span> user<span class="token punctuation">.</span>isModerator <span class="token delimiter punctuation">%}</span></span>
|
|
您拥有提升的权限
|
|
<span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> <span class="token keyword">endif</span> <span class="token delimiter punctuation">%}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
|
|
|
|
<h3 id="contains" class="article-heading"><a href="#contains" class="headerlink" title="contains"></a>contains<a class="article-anchor" href="#contains" aria-hidden="true"></a></h3><p>检查字符串是否包含子字符串，或数组是否包含元素。</p>
|
|
<p>输入</p>
|
|
<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">if</span> <span class="token object">product</span><span class="token punctuation">.</span>title <span class="token operator">contains</span> <span class="token string">"Pack"</span> <span class="token delimiter punctuation">%}</span></span>
|
|
这是一个套装
|
|
<span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> <span class="token keyword">endif</span> <span class="token delimiter punctuation">%}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
|
|
|
|
<h2 id="优先级" class="article-heading"><a href="#优先级" class="headerlink" title="优先级"></a>优先级<a class="article-anchor" href="#优先级" aria-hidden="true"></a></h2><ol>
|
|
<li>比较运算符和 <code>contains</code>。所有比较运算符和 <code>contains</code> 具有同样的（最高）优先级。</li>
|
|
<li><code>not</code> 运算符。它的优先级略高于 <code>or</code> 和 <code>and</code>。</li>
|
|
<li><code>or</code> 和 <code>and</code> 运算符。这些逻辑运算符具有同样的（最低）优先级。</li>
|
|
</ol>
|
|
<h2 id="结合性" class="article-heading"><a href="#结合性" class="headerlink" title="结合性"></a>结合性<a class="article-anchor" href="#结合性" aria-hidden="true"></a></h2><p>逻辑运算符是右结合的，所以连续的逻辑运算时计算顺序是从右向左，参考 <a target="_blank" rel="noopener external nofollow noreferrer" href="https://help.shopify.com/en/themes/liquid/basics/operators#order-of-operations">Shopify</a> 的文档。</p>
|
|
|
|
</div>
|
|
<footer class="article-footer">
|
|
<time class="article-footer-updated" datetime="2026-04-19T15:41:51.045Z" itemprop="dateModified">上次更新：2026-04-19</time>
|
|
<a href="plugins.html" class="article-footer-prev" title="插件"><i class="icon-chevron-left"></i><span>上一页</span></a><a href="truthy-and-falsy.html" class="article-footer-next" title="真和假"><span>下一页</span><i class="icon-chevron-right"></i></a>
|
|
</footer>
|
|
</div>
|
|
</div>
|
|
<aside id="article-toc" role="navigation">
|
|
<div id="article-toc-inner">
|
|
<div id="article-toc-inner-list">
|
|
<strong class="sidebar-title">目录</strong>
|
|
<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E9%80%BB%E8%BE%91%E8%BF%90%E7%AE%97%E7%AC%A6"><span class="toc-text">逻辑运算符</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#not"><span class="toc-text">not</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#and"><span class="toc-text">and</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#or"><span class="toc-text">or</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#contains"><span class="toc-text">contains</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BC%98%E5%85%88%E7%BA%A7"><span class="toc-text">优先级</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E7%BB%93%E5%90%88%E6%80%A7"><span class="toc-text">结合性</span></a></li></ol>
|
|
</div>
|
|
<a href="#" id="article-toc-top">回到顶部</a>
|
|
</div>
|
|
</aside>
|
|
</div>
|
|
</article>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<footer id="footer" class="wrapper">
|
|
<div class="inner">
|
|
<div id="footer-copyright">
|
|
© 2026 <a href="https://github.com/harttle/liquidjs/graphs/contributors" rel="external nofollow noreferrer" target="_blank">Harttle</a><br>
|
|
本文档通过 <a href="http://creativecommons.org/licenses/by/4.0/" rel="external nofollow noreferrer" target="_blank">CC BY 4.0</a> 授权。
|
|
</div>
|
|
<div id="footer-links">
|
|
<a href="https://twitter.com/harttleharttle" rel="external nofollow noreferrer" class="footer-link" target="_blank"><i class="icon-twitter"></i></a>
|
|
<a href="https://opencollective.com/liquidjs" rel="external nofollow noreferrer" class="footer-link" target="_blank"><i class="icon-opencollective"></i></a>
|
|
<a href="https://github.com/harttle/liquidjs" rel="external nofollow noreferrer" class="footer-link" target="_blank"><i class="icon-github"></i></a>
|
|
</div>
|
|
</div>
|
|
</footer>
|
|
|
|
</div>
|
|
<div id="mobile-nav-dimmer"></div>
|
|
<nav id="mobile-nav">
|
|
<div id="mobile-nav-inner">
|
|
<ul id="mobile-nav-list">
|
|
<a href="intro-to-liquid.html" class="mobile-nav-link">教程</a><a href="../tags/overview.html" class="mobile-nav-link">标签</a><a href="../filters/overview.html" class="mobile-nav-link">过滤器</a><a href="../playground.html" class="mobile-nav-link">演示</a><a href="../../api/classes/Liquid.html" class="mobile-nav-link">API</a>
|
|
</ul>
|
|
|
|
<div class="mobile-sidebar-list">
|
|
<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="escaping.html" class="mobile-nav-link">转义</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="drops.html" class="mobile-nav-link">Liquid Drop</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">插件</a><a href="operators.html" class="mobile-nav-link current">运算符</a><a href="truthy-and-falsy.html" class="mobile-nav-link">真和假</a><a href="dos.html" class="mobile-nav-link">DoS</a><a href="static-analysis.html" class="mobile-nav-link">静态分析</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>
|
|
</div>
|
|
|
|
</div>
|
|
<div id="mobile-button-list">
|
|
<a href="https://github.com/harttle/liquidjs" class="mobile-nav-link" rel="external" target="_blank"><i class="icon-github"></i></a>
|
|
<a href="https://opencollective.com/liquidjs" class="mobile-nav-link" rel="external" target="_blank"><i class="icon-opencollective"></i></a>
|
|
<div id="mobile-lang-select-wrap" class="mobile-nav-link">
|
|
<label for="mobile-lang-select"><i class="icon-network"></i></label>
|
|
<select id="mobile-lang-select" data-canonical="tutorials/operators.html">
|
|
|
|
<option value="en">English</option>
|
|
|
|
<option value="zh-cn" selected>简体中文</option>
|
|
|
|
</select>
|
|
</div>
|
|
</div>
|
|
</nav>
|
|
|
|
|
|
|
|
<script src="../../js/main.js"></script>
|
|
|
|
|
|
<script src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script>
|
|
<script>
|
|
document.getElementById('search-input-wrap').classList.add('on');
|
|
docsearch({
|
|
appId: 'QJ35YOZTU4',
|
|
apiKey: '8c6cbb824b4c5023f0bb2ef29e228bef',
|
|
indexName: 'liquidjs',
|
|
inputSelector: '#search-input',
|
|
debug: false
|
|
});
|
|
</script>
|
|
</body>
|
|
</html> |