uTools-Manuals/docs/jQuery/mouseover.html

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<h1 class="entry-title">.mouseover()</h1>
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						所属分类：<span class="category"><a href="/category/events/">事件</a> &gt; <a href="/category/events/mouse-events/">鼠标事件</a></span>
<span class="pull-right">英文文档：<a href="https://api.jquery123.com/mouseover/" target="_blank">.mouseover()</a></span>
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<span class="name">.mouseover( handler(eventObject) )</span><span class="returns">返回: <a href="/Types/#jQuery">jQuery</a></span>
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<p class="desc"><strong>描述: </strong>为 JavaScript 的 "mouseover" 事件绑定一个处理函数，或者触发元素上的该事件。（注：支持事件冒泡）</p>
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.mouseover( handler(eventObject) )</h4>
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<div><strong>handler(eventObject)</strong></div>
<div>类型: <a href="/Types/#Function">Function</a>()</div>
<div>每次事件触发时会执行的函数。</div>
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<span class="version-details">添加的版本: <a href="/category/version/1.4.3/">1.4.3</a></span>.mouseover(  [eventData ], handler(eventObject) )</h4>
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<div><strong>eventData</strong></div>
<div>类型: <a href="/Types/#PlainObject">PlainObject</a>
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<div>一个对象，它包含的数据键值对映射将被传递给事件处理程序。</div>
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<div><strong>handler(eventObject)</strong></div>
<div>类型: <a href="/Types/#Function">Function</a>()</div>
<div>每次事件触发时会执行的函数。</div>
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.mouseover()</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>这个方法的前两个用法是 <code>.bind('mouseover', handler)</code> 的快捷方式，第3个不带参数的用法是 <code>.trigger('mouseover')</code> 的快捷方式。</p>
<p>当鼠标指针进入元素内时，<code>mouseover</code>事件就会被触发，任何HTML元素都可以接受此事件。</p>
<p>举例来说，请看下面的HTML：</p>
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<pre><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"outer"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  Outer</code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"inner"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>    Inner</code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"other"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  Trigger the handler</code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"log"</span>&gt;</span><span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div></pre>
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<p>这个事件可以绑定到任何元素:</p>
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<pre><div class="container"><div class="line"><code>$(<span class="string">'#outer'</span>).mouseover(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>  $(<span class="string">'#log'</span>).append(<span class="string">'&lt;div&gt;Handler for .mouseover() called.&lt;/div&gt;'</span>);</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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<p>现在当指针进入<span class="output">Outer</span> <code>&lt;div&gt;</code>元素时，“Handler for .mousedown() called.”这个字符串将被添加到<code>&lt;div id="log"&gt;</code>。我们也可以通过点击其它元素，手动触发另一个元素上的该事件：</p>
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<pre><div class="container"><div class="line"><code>$(<span class="string">'#other'</span>).click(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>      $(<span class="string">'#outer'</span>).mouseover();</code></div></div><div class="container"><div class="line"><code>      });</code></div></div></pre>
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<p>这些代码执行后，点击<span class="output">Trigger the handler</span> 同样添加这个信息。</p>
<p>由于此事件类型冒泡，可能导致引起的很多头痛的问题。例如，在这个例子中当鼠标指针移出<span class="output">Inner</span>元素，<code>mouseover</code>事件将被发送到<span class="output">Inner</span>元素，然后冒泡到<span class="output">Outer</span>元素 。这可能会不合时宜的触发绑定的<code>mouseover</code>处理函数。这可以用一个替代方法，见讨论<code>. <a href="/mouseleave">mouseenter</a> ()</code>。</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">当触发 mouseover 和 mouseenter 事件时，显示鼠标移出对象的次数。当鼠标移入绑定 mouseover 事件元素的子元素时，mouseover 事件同样会被触发。但是，只有在绑定 mouseenter 事件的元素上，将鼠标移入时，才会触发该事件。</span></h4>
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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></code></div></div><div class="container"><div class="line"><code><span class="tag">div</span><span class="class">.out</span> <span class="rules">{ <span class="rule"><span class="attribute">width</span>:<span class="value"><span class="number">40</span>%;</span></span> <span class="rule"><span class="attribute">height</span>:<span class="value"><span class="number">120</span>px;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">0</span> <span class="number">15</span>px;</span></span></span></code></div></div><div class="container"><div class="line"><code>          <span class="rule"><span class="attribute">background-color</span>:<span class="value"><span class="hexcolor">#D6EDFC</span>;</span></span> <span class="rule"><span class="attribute">float</span>:<span class="value">left;</span></span> <span class="rule">}</span></code></div></div><div class="container"><div class="line"><code><span class="tag">div</span><span class="class">.in</span> <span class="rules">{  <span class="rule"><span class="attribute">width</span>:<span class="value"><span class="number">60</span>%;</span></span> <span class="rule"><span class="attribute">height</span>:<span class="value"><span class="number">60</span>%;</span></span></span></code></div></div><div class="container"><div class="line"><code>          <span class="rule"><span class="attribute">background-color</span>:<span class="value"><span class="hexcolor">#FFCC00</span>;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">10</span>px auto;</span></span> <span class="rule">}</span></code></div></div><div class="container"><div class="line"><code><span class="tag">p</span> <span class="rules">{ <span class="rule"><span class="attribute">line-height</span>:<span class="value"><span class="number">1</span>em;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">0</span>;</span></span> <span class="rule"><span class="attribute">padding</span>:<span class="value"><span class="number">0</span>;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code><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> </code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">div</span> <span class="attribute">class</span>=<span class="value">"out overout"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">span</span>&gt;</span>move your mouse<span class="tag">&lt;/<span class="title">span</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">div</span> <span class="attribute">class</span>=<span class="value">"in"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">div</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">div</span> <span class="attribute">class</span>=<span class="value">"out enterleave"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">span</span>&gt;</span>move your mouse<span class="tag">&lt;/<span class="title">span</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">div</span> <span class="attribute">class</span>=<span class="value">"in"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">div</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">script</span>&gt;</span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code>  <span class="keyword">var</span> i = <span class="number">0</span>;</code></div></div><div class="container"><div class="line"><code>  $(<span class="string">"div.overout"</span>).mouseover(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>    i += <span class="number">1</span>;</code></div></div><div class="container"><div class="line"><code>    $(<span class="keyword">this</span>).find(<span class="string">"span"</span>).text( <span class="string">"mouse over x "</span> + i );</code></div></div><div class="container"><div class="line"><code>  }).mouseout(<span class="keyword">function</span>(){</code></div></div><div class="container"><div class="line"><code>    $(<span class="keyword">this</span>).find(<span class="string">"span"</span>).text(<span class="string">"mouse out "</span>);</code></div></div><div class="container"><div class="line"><code>  });</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>  <span class="keyword">var</span> n = <span class="number">0</span>;</code></div></div><div class="container"><div class="line"><code>  $(<span class="string">"div.enterleave"</span>).mouseenter(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>    n += <span class="number">1</span>;</code></div></div><div class="container"><div class="line"><code>    $(<span class="keyword">this</span>).find(<span class="string">"span"</span>).text( <span class="string">"mouse enter x "</span> + n );</code></div></div><div class="container"><div class="line"><code>  }).mouseleave(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>    $(<span class="keyword">this</span>).find(<span class="string">"span"</span>).text(<span class="string">"mouse leave"</span>);</code></div></div><div class="container"><div class="line"><code>  });</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">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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