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 mouseOver()
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{
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document.getElementById('b1').src ="/img/eg_mouse.jpg"
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}
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function mouseOut()
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{
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document.getElementById('b1').src ="/img/eg_mouse2.jpg"
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}
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</script>
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</head>
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​
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<body>
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<a href="//www.w3xue.com" onmouseover="mouseOver()" onmouseout="mouseOut()">
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<img alt="Visit W3xue!" src="/img/eg_mouse2.jpg" id="b1" />
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</a>
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</body>
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</html>