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fofolee
273 lines
21 KiB
HTML
273 lines
21 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">.prepend()</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-inside/">DOM 插入现有元素内</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/prepend/" target="_blank">.prepend()</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="prepend1"><h2 class="section-title">
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<span class="name">.prepend( content [, content ] )</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>将参数内容插入到每个匹配元素的前面（元素内部）。</p>
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<ul class="signatures">
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<li class="signature" id="prepend-content-content">
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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>.prepend( content [, content ] )</h4>
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<ul>
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<li>
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<div><strong>content</strong></div>
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<div>类型: <a href="/Types/#String,%20Element,%20jQuery">String, Element, jQuery</a>
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</div>
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<div>DOM元素，元素数组，HTML字符串，或者jQuery对象，将被插入到匹配元素前的内容。</div>
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</li>
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<li>
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<div><strong>content</strong></div>
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<div>类型: <a href="/Types/#String,%20Element,%20jQuery">String, Element, jQuery</a>
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</div>
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<div>一个或多个DOM元素，元素数组，HTML字符串，或者jQuery对象，将被插入到匹配元素前的内容。</div>
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</li>
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</ul>
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</li>
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<li class="signature" id="prepend-functionindex--html">
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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>.prepend( function(index, html) )</h4>
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<ul><li>
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<div><strong>function(index, html)</strong></div>
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<div>类型: <a href="/Types/#Function">Function</a>()</div>
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<div>
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一个返回HTML字符串，DOM元素，jQuery对象的函数，该字符串用来插入到匹配元素的开始处。 接收index 参数表示元素在匹配集合中的索引位置和html 参数表示元素上原来的 HTML 内容。在函数中<code>this</code>指向元素集合中的当前元素。
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</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><code>.prepend()</code>方法将指定元素插入到匹配元素里面作为它的第一个子元素
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(如果要作为最后一个子元素插入用<a href="/append"><code>.append()</code></a>). </p>
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<p><code>.prepend()</code>和<code><a href="/prependTo">.prependTo()</a></code>实现同样的功能，主要的不同是语法，插入的内容和目标的位置不同。
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对于 <code> .prepend()</code> 而言，选择器表达式写在方法的前面，作为待插入内容的容器，将要被插入的内容作为方法的参数。而 <code>.prependTo()</code> 正好相反，将要被插入的内容写在方法的前面，可以是选择器表达式或动态创建的标记，待插入内容的容器作为参数。
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</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">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>我们可以创建内容然后同时插入到好几个元素里面：</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">'.inner'</span>).prepend(<span class="string">'<p>Test</p>'</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>每个 <code><div class="inner"></code> 元素得到新内容:</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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<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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</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></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> Hello</code></div></div><div class="container"><div class="line"><code> <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></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> Goodbye</code></div></div><div class="container"><div class="line"><code> <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里面：</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">'.container'</span>).prepend($(<span class="string">'h2'</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入到另外一个地方，这是移动而不是复制：</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">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><strong>重要</strong>:
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如果有多个目标元素，内容将被复制然后插入到每个目标里面。
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</p>
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<h4 id="additional-arguments">Additional Arguments（额外的参数）</h4>
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<p>
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类似的其他内容的添加方法，如<code><a href="/append">.append()</a></code> 和 <code><a href="/before">.before()</a></code>, <code>.prepend()</code> 还支持传递输入多个参数。支持的输入包括DOM元素，jQuery对象，HTML字符串，DOM元素的数组。</p>
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<p>例如，下面将插入两个新的<code><div></code>和现有的<code><div></code>到 body作为最后三个子节点：</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> $newdiv1 = $(<span class="string">'<div id="object1"/>'</span>),</code></div></div><div class="container"><div class="line"><code> newdiv2 = document.createElement(<span class="string">'div'</span>),</code></div></div><div class="container"><div class="line"><code> existingdiv1 = document.getElementById(<span class="string">'foo'</span>);</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>$(<span class="string">'body'</span>).prepend($newdiv1, [newdiv2, existingdiv1]);</code></div></div></pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>
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<code>.prepend()</code> 可以接受任何数量的额外的参数，相同的结果，可以通过传入三个<code><div></code>为三个独立的参数实现，就像这样<code>$('body').prepend($newdiv1, newdiv2, existingdiv1)</code>。参数的类型和数量
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将在很大程度上取决于在代码中被收集的元素。
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</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">Prepends some HTML to all paragraphs.</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 n14">14</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="tag">p</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">p</span>></span>there, friend!<span class="tag"></<span class="title">p</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>amigo!<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>).prepend(<span class="string">"<b>Hello </b>"</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>
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<div class="entry-example" id="example-1">
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<h4>Example: <span class="desc">Prepends a DOM Element to all paragraphs.</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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</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="tag">p</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">p</span>></span>is what I'd 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">p</span>></span>is what I said<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>).prepend(document.createTextNode(<span class="string">"Hello "</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>
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<div class="entry-example" id="example-2">
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<h4>Example: <span class="desc">Prepends a jQuery object (similar to an Array of DOM Elements) to all paragraphs.</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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</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="tag">p</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">p</span>></span> is what was said.<span class="tag"></<span class="title">p</span>></span><span class="tag"><<span class="title">b</span>></span>Hello<span class="tag"></<span class="title">b</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>).prepend( $(<span class="string">"b"</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> |