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306 lines
24 KiB
HTML
306 lines
24 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">.closest()</h1>
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<div class="entry-meta">
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所属分类：<span class="category"><a href="/category/traversing/">遍历</a> > <a href="/category/traversing/tree-traversal/">树遍历</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/closest/" target="_blank">.closest()</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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<div class="toc">
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<h4><span>Contents:</span></h4>
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<ul class="toc-list">
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<li>
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<a href="#closest1">.closest( selector )</a><ul>
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<li>.closest( selector )</li>
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<li>.closest( selector [, context ] )</li>
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<li>.closest( jQuery object )</li>
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<li>.closest( element )</li>
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</ul>
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</li>
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<li>
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<a href="#closest2">.closest( selectors [, context ] )</a><ul><li>.closest( selectors [, context ] )</li></ul>
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</li>
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</ul>
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</div><article class="entry method" id="closest1"><h2 class="section-title">
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<span class="name">.closest( selector )</span><span class="returns">返回: <a href="/Types/#jQuery">jQuery</a></span>
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</h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>从元素本身开始，在DOM 树上逐级向上级元素匹配，并返回最先匹配的祖先元素。</p>
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<ul class="signatures">
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<li class="signature" id="closest-selector">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.3/">1.3</a></span>.closest( selector )</h4>
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<ul><li>
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<div><strong>selector</strong></div>
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<div>类型: <a href="/Types/#Selector">Selector</a>
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</div>
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<div>一个用于匹配元素的选择器字符串。</div>
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</li></ul>
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</li>
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<li class="signature" id="closest-selector-context">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.4/">1.4</a></span>.closest( selector [, context ] )</h4>
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<ul>
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<li>
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<div><strong>selector</strong></div>
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<div>类型: <a href="/Types/#Selector">Selector</a>
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</div>
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<div>一个用于匹配元素的选择器字符串。</div>
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</li>
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<li>
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<div><strong>context</strong></div>
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<div>类型: <a href="/Types/#Element">Element</a>
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</div>
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<div>DOM元素在其中一个匹配的元素可以被发现。如果没有上下文在当时的情况下通过了jQuery集合将被使用。</div>
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</li>
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</ul>
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</li>
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<li class="signature" id="closest-jQuery-object">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.6/">1.6</a></span>.closest( jQuery object )</h4>
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<ul><li>
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<div><strong>jQuery object</strong></div>
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<div>类型: <a href="/Types/#jQuery">jQuery</a>
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</div>
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<div>一个用于匹配元素的jQuery对象。</div>
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</li></ul>
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</li>
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<li class="signature" id="closest-element">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.6/">1.6</a></span>.closest( element )</h4>
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<ul><li>
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<div><strong>element</strong></div>
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<div>类型: <a href="/Types/#Element">Element</a>
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</div>
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<div>一个用于匹配元素的DOM元素。</div>
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</li></ul>
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</li>
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</ul>
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<div class="longdesc" id="entry-longdesc">
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<p>鉴于一个jQuery对象，表示一个DOM元素的集合，<code>.closest()</code>方法允许我们在DOM树上查找这些匹配的元素和他们的祖先元素，并且构造一个新的jQuery对象。<a href="/parents"><code>.parents()</code></a>和<code>.closest()</code>方法类似，它们都在DOM树遍历了。两者之间的差异，尽管细微，是重要的：</p>
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<table>
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<thead>
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<tr>
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<th>
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<code>.closest()</code>
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</th>
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<th>
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<a href="/parents">
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<code>.parents()</code>
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</a>
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</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>开始于当前元素</td>
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<td>开始于父元素</td>
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</tr>
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<tr>
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<td>在 DOM 树中向上遍历，直到找到了与提供的选择器相匹配的元素</td>
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<td>向上遍历DOM树到文档的根元素，每个祖先元素加入到临时集合，如果提供一个选择器，则会使用该选择器在集合中进行过滤</td>
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</tr>
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<tr>
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<td>返回包含零个或一个元素的jQuery对象</td>
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<td>返回包含零个，一个或多个元素的jQuery对象</td>
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</tr>
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</tbody>
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</table>
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<div class="syntaxhighlighter xml nogutter">
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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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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code><span class="tag"><<span class="title">ul</span> <span class="attribute">id</span>=<span class="value">"one"</span> <span class="attribute">class</span>=<span class="value">"level-1"</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">class</span>=<span class="value">"item-i"</span>></span>I<span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">id</span>=<span class="value">"ii"</span> <span class="attribute">class</span>=<span class="value">"item-ii"</span>></span>II</code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">ul</span> <span class="attribute">class</span>=<span class="value">"level-2"</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">class</span>=<span class="value">"item-a"</span>></span>A<span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">class</span>=<span class="value">"item-b"</span>></span>B</code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">ul</span> <span class="attribute">class</span>=<span class="value">"level-3"</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">class</span>=<span class="value">"item-1"</span>></span>1<span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">class</span>=<span class="value">"item-2"</span>></span>2<span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">class</span>=<span class="value">"item-3"</span>></span>3<span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">ul</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">class</span>=<span class="value">"item-c"</span>></span>C<span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">ul</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span> <span class="attribute">class</span>=<span class="value">"item-iii"</span>></span>III<span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">ul</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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<p>假设我们从项目 A开始执行一个搜索<code><ul></code>：</p>
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<div class="syntaxhighlighter javascript nogutter">
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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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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code>$(<span class="string">'li.item-a'</span>).closest(<span class="string">'ul'</span>)</code></div></div><div class="container"><div class="line"><code> .css(<span class="string">'background-color'</span>, <span class="string">'red'</span>);</code></div></div></pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>这将改变level-2 <code><ul></code>的颜色，因为当向上遍历DOM树时，这是第一次遇到的匹配元素。</p>
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<p>假设我们是一个搜索<code><li></code>元素来代替：</p>
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<div class="syntaxhighlighter javascript nogutter">
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<table>
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<tbody>
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<tr>
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<td class="gutter">
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<div class="line n1">1</div>
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<div class="line n2">2</div>
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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code>$(<span class="string">'li.item-a'</span>).closest(<span class="string">'li'</span>)</code></div></div><div class="container"><div class="line"><code> .css(<span class="string">'background-color'</span>, <span class="string">'red'</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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<p>其结果是改变了列表项 A 的元素。<code>.closest()</code>方法是<em>从自身元素</em>开始查找的，然后在 DOM 树中向上遍历，直到找到了所提供的表达式列表项 A。</p>
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<p>我们可以传递一个DOM元素作为上下文在其中搜索最近的元素的。</p>
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<div class="syntaxhighlighter javascript nogutter">
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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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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code><span class="keyword">var</span> listItemII = document.getElementById(<span class="string">'ii'</span>);</code></div></div><div class="container"><div class="line"><code>$(<span class="string">'li.item-a'</span>).closest(<span class="string">'ul'</span>, listItemII)</code></div></div><div class="container"><div class="line"><code> .css(<span class="string">'background-color'</span>, <span class="string">'red'</span>);</code></div></div><div class="container"><div class="line"><code>$(<span class="string">'li.item-a'</span>).closest(<span class="string">'#one'</span>, listItemII)</code></div></div><div class="container"><div class="line"><code> .css(<span class="string">'background-color'</span>, <span class="string">'green'</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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<p>这将改变level-2 <code><ul></code>的颜色,因为它既是项目A的第一个<code><ul></code>祖先又是项目II的一个后裔。它将不会改变level-1 <code><ul></code>的 颜色 ，因为它不是项目II的后代。</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>Example: <span class="desc">显示什么样的事件委托能用closest完成。closest 列表元素或者其后代被点击进行切换一个黄色的背景。</span>
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</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 n9">9</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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<div class="line n20">20</div>
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<div class="line n21">21</div>
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<div class="line n22">22</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">li</span> <span class="rules">{ <span class="rule"><span class="attribute">margin</span>:<span class="value"> <span class="number">3</span>px;</span></span> <span class="rule"><span class="attribute">padding</span>:<span class="value"> <span class="number">3</span>px;</span></span> <span class="rule"><span class="attribute">background</span>:<span class="value"> <span class="hexcolor">#EEEEEE</span>;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">li</span><span class="class">.hilight</span> <span class="rules">{ <span class="rule"><span class="attribute">background</span>:<span class="value"> yellow;</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">ul</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span>></span><span class="tag"><<span class="title">b</span>></span>Click me!<span class="tag"></<span class="title">b</span>></span><span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span>></span>You can also <span class="tag"><<span class="title">b</span>></span>Click me!<span class="tag"></<span class="title">b</span>></span><span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">ul</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></code></div></div><div class="container"><div class="line"><code> $( document ).bind(<span class="string">"click"</span>, <span class="keyword">function</span>( e ) {</code></div></div><div class="container"><div class="line"><code> $( e.target ).closest(<span class="string">"li"</span>).toggleClass(<span class="string">"hilight"</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">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>
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<div class="entry-example" id="example-1">
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<h4>Example: <span class="desc">传递一个jQuery对象给closest. closest 列表元素或者其后代被点击进行切换一个黄色的背景。</span>
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</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 n19">19</div>
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<div class="line n21">21</div>
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<div class="line n22">22</div>
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<div class="line n23">23</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">li</span> <span class="rules">{ <span class="rule"><span class="attribute">margin</span>:<span class="value"> <span class="number">3</span>px;</span></span> <span class="rule"><span class="attribute">padding</span>:<span class="value"> <span class="number">3</span>px;</span></span> <span class="rule"><span class="attribute">background</span>:<span class="value"> <span class="hexcolor">#EEEEEE</span>;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">li</span><span class="class">.hilight</span> <span class="rules">{ <span class="rule"><span class="attribute">background</span>:<span class="value"> yellow;</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">ul</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span>></span><span class="tag"><<span class="title">b</span>></span>Click me!<span class="tag"></<span class="title">b</span>></span><span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">li</span>></span>You can also <span class="tag"><<span class="title">b</span>></span>Click me!<span class="tag"></<span class="title">b</span>></span><span class="tag"></<span class="title">li</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">ul</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></code></div></div><div class="container"><div class="line"><code> <span class="keyword">var</span> $listElements = $(<span class="string">"li"</span>).css(<span class="string">"color"</span>, <span class="string">"blue"</span>);</code></div></div><div class="container"><div class="line"><code> $( document ).bind(<span class="string">"click"</span>, <span class="keyword">function</span>( e ) {</code></div></div><div class="container"><div class="line"><code> $( e.target ).closest( $listElements ).toggleClass(<span class="string">"hilight"</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">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>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<h4>Demo:</h4>
|
||
<div class="demo code-demo"><iframe height="250" width="100%"></iframe></div>
|
||
</div></section>
|
||
</div></article><article class="entry method" id="closest2"><h2 class="section-title">
|
||
<span class="name">.closest( selectors [, context ] )</span><span class="returns">返回: <a href="/Types/#Array">Array</a></span><span class="version-details">version deprecated: <a href="/category/version/1.7/">1.7</a>, removed: <a href="/category/version/1.8/">1.8</a></span>
|
||
</h2>
|
||
<div class="entry-wrapper">
|
||
<p class="desc"><strong>描述: </strong>以数组的形式返回与选择器相匹配的所有元素，从当前元素开始，在 DOM 树中向上遍历。</p>
|
||
<ul class="signatures"><li class="signature" id="closest-selectors-context">
|
||
<h4 class="name">
|
||
<span class="version-details">添加的版本: <a href="/category/version/1.4/">1.4</a></span>.closest( selectors [, context ] )</h4>
|
||
<ul>
|
||
<li>
|
||
<div><strong>selectors</strong></div>
|
||
<div>类型: <a href="/Types/#Array">Array</a>
|
||
</div>
|
||
<div>数组或字符串，其中包含一个选择表达式匹配的元素对（也可以是一个jQuery对象）。</div>
|
||
</li>
|
||
<li>
|
||
<div><strong>context</strong></div>
|
||
<div>类型: <a href="/Types/#Element">Element</a>
|
||
</div>
|
||
<div>用于查找可能匹配到的 DOM 元素。如果不提供 context 参数，那么会使用 jQuery 集合的 context。</div>
|
||
</li>
|
||
</ul>
|
||
</li></ul>
|
||
<div class="longdesc" id="entry-longdesc-1">
|
||
<p><strong>下面这个方法 (only!) jQuery1.7中不赞成使用，在jQuery1.8中被<em>删除</em>。</strong>它主要是为了让插件作者在内部使用。</p>
|
||
</div>
|
||
</div></article> </div>
|
||
</article> |