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https://github.com/fofolee/uTools-Manuals.git
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153 lines
11 KiB
HTML
153 lines
11 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">.insertBefore()</h1>
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<div class="entry-meta">
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所属分类：<span class="category"><a href="/category/manipulation/">DOM 操作</a> > <a href="/category/manipulation/dom-insertion-outside/">DOM 插入现有元素外</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/insertBefore/" target="_blank">.insertBefore()</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 method" id="insertBefore1"><h2 class="section-title">
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<span class="name">.insertBefore( target )</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>在目标元素前面插入集合中每个匹配的元素(注：插入的元素作为目标元素的兄弟元素)。</p>
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<ul class="signatures"><li class="signature" id="insertBefore-target">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.insertBefore( target )</h4>
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<ul><li>
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<div><strong>target</strong></div>
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<div>类型: <a href="/Types/#Selector,%20Element,%20jQuery">Selector, Element, jQuery</a>
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</div>
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<div>一个选择器，元素，HTML字符串或者jQuery对象，匹配的元素将会被插入在由参数指定的目标后面。</div>
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</li></ul>
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</li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p>The <code><a href="/before">.before()</a></code>和<code>.insertBefore()</code>实现同样的功能。主要的区别是语法——内容和目标的位置。
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对于<code> .before()</code>，选择表达式在函数前面，内容作为参数，而<code>.insertBefore()</code>刚好相反，内容在方法前面，它将被放在参数里元素的前面。</p>
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<p>请看下面的HTML：</p>
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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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</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">div</span> <span class="attribute">class</span>=<span class="value">"container"</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">h2</span>></span>Greetings<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">div</span> <span class="attribute">class</span>=<span class="value">"inner"</span>></span>Hello<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span> <span class="attribute">class</span>=<span class="value">"inner"</span>></span>Goodbye<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">div</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>我们可以创建内容然后同时插在好几个元素前面：</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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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code>$(<span class="string">'<p>Test</p>'</span>).insertBefore(<span class="string">'.inner'</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>得到新内容如下：</p>
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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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</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">div</span> <span class="attribute">class</span>=<span class="value">"container"</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">h2</span>></span>Greetings<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>Test<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">div</span> <span class="attribute">class</span>=<span class="value">"inner"</span>></span>Hello<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">p</span>></span>Test<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">div</span> <span class="attribute">class</span>=<span class="value">"inner"</span>></span>Goodbye<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">div</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>我们也可以在页面上选择一个元素然后插在另一个元素前面：</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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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code>$(<span class="string">'h2'</span>).insertBefore($(<span class="string">'.container'</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>如果一个被选中的元素被插在另外一个地方，它将被移动到目标元素的前面，注意是移动而不是复制：</p>
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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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</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">h2</span>></span>Greetings<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">div</span> <span class="attribute">class</span>=<span class="value">"container"</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span> <span class="attribute">class</span>=<span class="value">"inner"</span>></span>Hello<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span> <span class="attribute">class</span>=<span class="value">"inner"</span>></span>Goodbye<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">div</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>如果有多个目标元素，会将克隆拷贝插入的元素，插入到每个目标元素的前面，然后返回新集合（原始元素和克隆元素）。</p>
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<p><strong>jQuery 1.9之前,</strong> 追加到单元素的情况下
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没有创建一个新的集合，而返回原来的集合，当使用一个未知个数的元素时，这使我们难以使用<code>.end()</code>方法。</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">在id为"foo"的元素前面插入段落。和 $("#foo").before("p")一样。</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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</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 class="id">#foo</span> <span class="rules">{ <span class="rule"><span class="attribute">background</span>:<span class="value">yellow;</span></span> <span class="rule">}</span></span></span><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">div</span> <span class="attribute">id</span>=<span class="value">"foo"</span>></span>FOO!<span class="tag"></<span class="title">div</span>></span><span class="tag"><<span class="title">p</span>></span>I would like to say: <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">"p"</span>).insertBefore(<span class="string">"#foo"</span>); <span class="comment">// check before() examples</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> |