案例：HTML DOM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 cursor(event)
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{
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document.getElementById('trail').style.visibility="visible"
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document.getElementById('trail').style.position="absolute"
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document.getElementById('trail').style.left=event.clientX+10
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document.getElementById('trail').style.top=event.clientY
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}
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</script>
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</head>
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​
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<body onmousemove="cursor(event)">
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​
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<h1>请在页面上移动指针</h1>
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​
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<img id="trail" style="visibility:hidden" src="/img/eg_W3xue.gif" />
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​
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</body>
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​
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</html>
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​