案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<head>
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<script type="text/javascript">
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function getRelatedElement(event)
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  {
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  alert("The cursor just exited the " + event.relatedTarget.tagName + " element.");
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  }
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</script>
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</head>
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<body>
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​
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<p onmouseover="getRelatedElement(event)">Mouse over this paragraph.</p>
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​
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</body>
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</html>
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​