uTools-Manuals/docs/jQuery/last.html

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<h1 class="entry-title">.last()</h1>
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						所属分类：<span class="category"><a href="/category/traversing/">遍历</a> &gt; <a href="/category/traversing/filtering/">过滤</a></span>
<span class="pull-right">英文文档：<a href="https://api.jquery123.com/last/" target="_blank">.last()</a></span>
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<span class="name">.last()</span><span class="returns">返回: <a href="/Types/#jQuery">jQuery</a></span>
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<p class="desc"><strong>描述: </strong>获取匹配元素集合中最后一个元素。</p>
<ul class="signatures"><li class="signature" id="last">
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<span class="version-details">添加的版本: <a href="/category/version/1.4/">1.4</a></span>.last()</h4>
<ul><li><div class="null-signature">这个方法不接受任何参数。</div></li></ul>
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<p>如果一个jQuery对象表示一个DOM元素的集合，<code>.last()</code>方法从最后一个匹配的元素中构造一个新的jQuery对象。</p>
<p>考虑一个页面上的一个简单的列表：</p>
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<table>
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<td class="gutter">
<div class="line n1">1</div>
<div class="line n2">2</div>
<div class="line n3">3</div>
<div class="line n4">4</div>
<div class="line n5">5</div>
<div class="line n6">6</div>
<div class="line n7">7</div>
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<pre><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">ul</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">li</span>&gt;</span>list item 1<span class="tag">&lt;/<span class="title">li</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">li</span>&gt;</span>list item 2<span class="tag">&lt;/<span class="title">li</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">li</span>&gt;</span>list item 3<span class="tag">&lt;/<span class="title">li</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">li</span>&gt;</span>list item 4<span class="tag">&lt;/<span class="title">li</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">li</span>&gt;</span>list item 5<span class="tag">&lt;/<span class="title">li</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">ul</span>&gt;</span></code></div></div></pre>
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<p>我们可以应用此方法设置列表项：</p>
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<td class="gutter">
<div class="line n1">1</div>
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<pre><div class="container"><div class="line"><code>$(<span class="string">'li'</span>).last().css(<span class="string">'background-color'</span>, <span class="string">'red'</span>);</code></div></div></pre>
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<p>调用的结果是最后一个项目为红色背景。</p>
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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">
<h4><span class="desc">高亮段落中的最后一个span</span></h4>
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<table>
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<td class="gutter">
<div class="line n1">1</div>
<div class="line n2">2</div>
<div class="line n3">3</div>
<div class="line n4">4</div>
<div class="line n5">5</div>
<div class="line n6">6</div>
<div class="line n7">7</div>
<div class="line n8">8</div>
<div class="line n9">9</div>
<div class="line n10">10</div>
<div class="line n11">11</div>
<div class="line n12">12</div>
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<pre><div class="container"><div class="line"><code><span class="doctype">&lt;!DOCTYPE html&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">html</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">style</span>&gt;</span><span class="css"><span class="class">.highlight</span><span class="rules">{<span class="rule"><span class="attribute">background-color</span>:<span class="value"> yellow}</span></span></span></span><span class="tag">&lt;/<span class="title">style</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>&gt;</span><span class="javascript"></span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">p</span>&gt;</span><span class="tag">&lt;<span class="title">span</span>&gt;</span>Look:<span class="tag">&lt;/<span class="title">span</span>&gt;</span> <span class="tag">&lt;<span class="title">span</span>&gt;</span>This is some text in a paragraph.<span class="tag">&lt;/<span class="title">span</span>&gt;</span> <span class="tag">&lt;<span class="title">span</span>&gt;</span>This is a note about it.<span class="tag">&lt;/<span class="title">span</span>&gt;</span><span class="tag">&lt;/<span class="title">p</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">script</span>&gt;</span><span class="javascript">$(<span class="string">"p span"</span>).last().addClass(<span class="string">'highlight'</span>);</span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">html</span>&gt;</span></code></div></div></pre>
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<h4>Demo:</h4>
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