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60 lines
6.6 KiB
HTML
60 lines
6.6 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">:empty 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/content-filter-selector/">内容过滤</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/empty-selector/" target="_blank">:empty 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="empty1"><h2 class="section-title"><span>empty selector</span></h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>选择所有没有子元素的元素（包括文本节点）。</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/1.0/">1.0</a></span>jQuery( ":empty" )</h4></li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p>这个和 <code>:parent</code>选择器相反。 </p>
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<p>需要注意的一件重要的事情是<code>:empty</code>(和 <code>:parent</code>)的子元素包括文本节点。</p>
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<p>W3C的建议<code><p></code>元素都至少有一个子节点，即使这个子节点是文字（见http://www.w3.org/TR/html401/struct/text.html＃edef-P）。另一方面，其他一些元素是空的（即没有子节点）：例如，<input>, <img>, <br>, 和 <hr>。</p>
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</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">查找的所有空元素 - 他们没有子元素或文本。/span></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 n20">20</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> </code></div></div><div class="container"><div class="line"><code> <span class="tag">td</span> <span class="rules">{ <span class="rule"><span class="attribute">text-align</span>:<span class="value">center;</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">table</span> <span class="attribute">border</span>=<span class="value">"1"</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">tr</span>></span><span class="tag"><<span class="title">td</span>></span>TD #0<span class="tag"></<span class="title">td</span>></span><span class="tag"><<span class="title">td</span>></span><span class="tag"></<span class="title">td</span>></span><span class="tag"></<span class="title">tr</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">tr</span>></span><span class="tag"><<span class="title">td</span>></span>TD #2<span class="tag"></<span class="title">td</span>></span><span class="tag"><<span class="title">td</span>></span><span class="tag"></<span class="title">td</span>></span><span class="tag"></<span class="title">tr</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">tr</span>></span><span class="tag"><<span class="title">td</span>></span><span class="tag"></<span class="title">td</span>></span><span class="tag"><<span class="title">td</span>></span>TD#5<span class="tag"></<span class="title">td</span>></span><span class="tag"></<span class="title">tr</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">table</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">"td:empty"</span>).text(<span class="string">"Was empty!"</span>).css(<span class="string">'background'</span>, <span class="string">'rgb(255,220,200)'</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> |