案例：HTML DOM案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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<html>
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<head>
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<style>
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span
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{
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font:12px arial;
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background:#CCCCCC;
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position:absolute;
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width:100;
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height:500;
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top:100;
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clip:rect(0 100 100 0);
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}
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</style>
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<script type="text/javascript">
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var interval
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startPosition=0
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topPosition=100
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endPosition=100
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speed=50
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​
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function scrollit()
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{
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if (startPosition!=200)
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    {
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    startPosition=startPosition+1
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    topPosition=topPosition-1
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    document.getElementById('display').style.clip="rect(" + (startPosition + 1) + " 100 " + (startPosition + endPosition) + " 0)"
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    document.getElementById('display').style.top=topPosition
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    interval=setTimeout("scrollit()",speed)
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    }
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else
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    {
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    startPosition=0
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    topPosition=100
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    endPosition=100
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    interval=setTimeout("scrollit()",speed)
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    }
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}
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​
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function stopinterval()
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{
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clearTimeout(interval)
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}
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</script>
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</head>
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​
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<body onload="scrollit()" onunload="stopinterval()">