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introduction-to-jade.html
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introduction-to-jade.html
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<h3 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h3><p>最近，到了新的公司上班，接触到的HTML编写方式为使用<code>jade</code>。<del>习惯了手写HTML硬编码的我，一时之间还不太适应这种快速高效的方式。</del></p>
<p>我们先通过一个例子来讲述一下这款工具的牛逼之处吧！</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">div.container#main Content</span><br><span class="line">a.btn(href="javascript:;",title="link") Button</span><br></pre></td></tr></table></figure>
<p>经过工具编译后，以上代码将会输出：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"container"</span> <span class="attr">id</span>=<span class="string">"main"</span>></span>Content<span class="tag"></<span class="name">div</span>></span></span><br><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">class</span>=<span class="string">"btn"</span> <span class="attr">href</span>=<span class="string">"javascript:;"</span> <span class="attr">title</span>=<span class="string">"link"</span>></span>Button<span class="tag"></<span class="name">a</span>></span></span><br></pre></td></tr></table></figure></p>
<p><del>是不是有种简单粗暴的即视感？</del></p>
<h3 id="基本语法"><a href="#基本语法" class="headerlink" title="基本语法"></a>基本语法</h3><p>基本属性的写法如下：</p>
<p>每行开始的第一个单词将会作为HTML标签名，如果没有，则默认为<code>div</code>。</p>
<p>类名和ID，同CSS选择器的语法——类名为<code>.</code>号开始，如果有多个类名，叠加展示即可。如<code>section.index.tips</code>；ID为<code>#</code>标识。</p>
<p>HTML元素的其他属性可以写在跟在后面的括号<code>()</code>之内。多个属性，可以使用逗号<code>,</code>或者空格<code></code>隔开。</p>
<p>元素内的文本则以一个空格后直接书写。</p>
<p>Jade采用对缩进敏感的语法，来划分HTML的层次结构。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">ul</span><br><span class="line"> li A </span><br><span class="line"> span text</span><br><span class="line"> li B</span><br><span class="line"> li C</span><br></pre></td></tr></table></figure>
<p>将会被编译成：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">ul</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>A<span class="tag"><<span class="name">span</span>></span>text<span class="tag"></<span class="name">span</span>></span><span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>B<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">Li</span>></span>C<span class="tag"></<span class="name">Li</span>></span></span><br><span class="line"><span class="tag"></<span class="name">ul</span>></span></span><br></pre></td></tr></table></figure></p>
<h3 id="循环"><a href="#循环" class="headerlink" title="循环"></a>循环</h3><p><code>jade</code>支持循环。比如：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">- for (var i = 0; i < 3; i++)</span><br><span class="line"> li item</span><br></pre></td></tr></table></figure></p>
<p>将会被编译成：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">li</span>></span>item<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"><span class="tag"><<span class="name">li</span>></span>item<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"><span class="tag"><<span class="name">li</span>></span>item<span class="tag"></<span class="name">li</span>></span></span><br></pre></td></tr></table></figure></p>
<h3 id="继承"><a href="#继承" class="headerlink" title="继承"></a>继承</h3><p><code>jade</code>使用<code>extends</code>来继承代码片段，继承可以修改代码片段。</p>
<p>页面中使用<code>block</code>标识符，可以指定一个代码片段的名字，比如名字设为<code>name</code>。在需要使用该代码片段的地方，直接使用<code>block name</code>即可。</p>
<h3 id="文件包含"><a href="#文件包含" class="headerlink" title="文件包含"></a>文件包含</h3><p><code>jade</code>可以使用<code>include</code>语法实现高度复用代码。将这些代码片段保存到不同的文件中，然后在需要的地方进行引入即可。</p>
<h3 id="混合宏"><a href="#混合宏" class="headerlink" title="混合宏"></a>混合宏</h3><p><code>mixin</code>是<code>jade</code>提供的另一个方法，可以很大程度提升HTML编写的效率。语法类似于<code>sass</code>和<code>less</code>中的混合宏。</p>
<p>混合宏具有高度复用、解耦、可读、可扩、可维护等特点，是众多预编译语言的共同特点。</p>
<p><code>jade</code>中使用<code>mixin</code>标识符进行混合宏的创建，在需要的地方使用<code>+</code>标识符进行调用即可。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">mixin list</span><br><span class="line"> ul</span><br><span class="line"> li foo</span><br><span class="line"> li bar</span><br><span class="line"> li baz</span><br><span class="line"></span><br><span class="line">+list</span><br><span class="line">+list</span><br></pre></td></tr></table></figure>
<p>将会被编译成：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">ul</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>foo<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>bar<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>baz<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"><span class="tag"></<span class="name">ul</span>></span></span><br><span class="line"><span class="tag"><<span class="name">ul</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>foo<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>bar<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>baz<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"><span class="tag"></<span class="name">ul</span>></span></span><br></pre></td></tr></table></figure></p>
<p>支持参数的传入：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">mixin card(name)</span><br><span class="line"> li.card= name</span><br><span class="line">ul</span><br><span class="line"> +card('A')</span><br><span class="line"> +card('B')</span><br><span class="line"> +card('C')</span><br></pre></td></tr></table></figure></p>
<p>将会被编译成：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">ul</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span> <span class="attr">class</span>=<span class="string">"card"</span>></span>A<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span> <span class="attr">class</span>=<span class="string">"card"</span>></span>B<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span> <span class="attr">class</span>=<span class="string">"card"</span>></span>C<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"><span class="tag"></<span class="name">ul</span>></span></span><br></pre></td></tr></table></figure></p>
<p>还可以使用余参：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">mixin list(id, ...items)</span><br><span class="line"> ul(id=id)</span><br><span class="line"> each item in items</span><br><span class="line"> li= item</span><br><span class="line"></span><br><span class="line">+list('example', 1, 2, 3, 4, 5)</span><br></pre></td></tr></table></figure></p>
<p>将会被编译成：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">ul</span> <span class="attr">id</span>=<span class="string">"example"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>1<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>2<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>3<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>4<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>5<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"><span class="tag"></<span class="name">ul</span>></span></span><br></pre></td></tr></table></figure></p>
<hr>
<p><code>jade</code>的入门级介绍到这里就告一段落，还有一些高级语法，可以参考官方文档。</p>
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