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https://github.com/fofolee/uTools-Manuals.git
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60 lines
6.2 KiB
HTML
60 lines
6.2 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">:header Selector</h1>
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<div class="entry-meta">
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所属分类：<span class="category"><a href="/category/selectors/">选择器</a> > <a href="/category/selectors/basic-filter-selectors/">基础过滤</a></span><span class="category-divider"> | </span><span class="category"><a href="/category/selectors/">选择器</a> > <a href="/category/selectors/jquery-selector-extensions/">jQuery 扩展</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/header-selector/" target="_blank">:header Selector</a></span>
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</div><!-- .entry-meta -->
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</header><!-- .entry-header -->
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<!-- .entry-header -->
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<div class="entry-content">
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<article class="entry selector" id="header1"><h2 class="section-title"><span>header selector</span></h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>选择所有标题元素，像h1, h2, h3 等.</p>
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<ul class="signatures"><li class="signature"><h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.2/">1.2</a></span>jQuery( ":header" )</h4></li></ul>
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<h3>Additional Notes:</h3>
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<div class="longdesc"><ul>
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<li>
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因为 <code>:header()</code> 是一个 jQuery 延伸出来的一个选择器 并且不是的CSS规范的一部分, 使用<code>:header()</code>查询不能充分利用原生DOM提供的<code>querySelectorAll()</code> 方法来提高性能。为了在现代浏览器上获得更佳的性能，请使用<a href="/filter"><code>.filter(":header")</code> </a>代替。
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</li>
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</ul></div>
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<section class="entry-examples" id="entry-examples"><header><h2 class="underline">例子:</h2></header><div class="entry-example" id="example-0">
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<h4><span class="desc">在页面上的所有的标题元素上添加背景和文本颜色。</span></h4>
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<div class="syntaxhighlighter xml ">
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<table>
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<tbody>
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<tr>
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<td class="gutter">
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<div class="line n1">1</div>
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<div class="line n2">2</div>
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<div class="line n3">3</div>
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<div class="line n4">4</div>
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<div class="line n5">5</div>
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<div class="line n6">6</div>
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<div class="line n7">7</div>
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<div class="line n8">8</div>
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<div class="line n9">9</div>
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<div class="line n10">10</div>
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<div class="line n11">11</div>
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<div class="line n12">12</div>
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<div class="line n13">13</div>
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<div class="line n14">14</div>
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<div class="line n15">15</div>
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<div class="line n16">16</div>
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<div class="line n17">17</div>
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<div class="line n18">18</div>
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<div class="line n19">19</div>
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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code><span class="doctype"><!DOCTYPE html></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">html</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">head</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">style</span>></span><span class="css"></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">body</span> <span class="rules">{ <span class="rule"><span class="attribute">font-size</span>:<span class="value"> <span class="number">10</span>px;</span></span> <span class="rule"><span class="attribute">font-family</span>:<span class="value"> Arial;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">h1</span>, <span class="tag">h2</span> <span class="rules">{ <span class="rule"><span class="attribute">margin</span>:<span class="value"> <span class="number">3</span>px <span class="number">0</span>;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">style</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>></span><span class="javascript"></span><span class="tag"></<span class="title">script</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">head</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">body</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">h1</span>></span>Header 1<span class="tag"></<span class="title">h1</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">p</span>></span>Contents 1<span class="tag"></<span class="title">p</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">h2</span>></span>Header 2<span class="tag"></<span class="title">h2</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">p</span>></span>Contents 2<span class="tag"></<span class="title">p</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">script</span>></span><span class="javascript">$(<span class="string">":header"</span>).css({ background:<span class="string">'#CCC'</span>, color:<span class="string">'blue'</span> });</span><span class="tag"></<span class="title">script</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">body</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">html</span>></span></code></div></div></pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div></section>
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</div></article> </div>
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</article> |