案例:HTML DOM案例     状态:可编辑再运行    进入横版
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<html>
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<head>
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<script type="text/javascript">
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var timer
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function scrolltop()
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{
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document.getElementById('scrollmenu').style.top=document.body.scrollTop
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timer=setTimeout("scrolltop()",1)
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}
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function stoptimer()
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{
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clearTimeout(timer)
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}
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</script>
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</head>
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<body onload="scrolltop()" onunload="stoptimer()">
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<span id="scrollmenu" style="position:absolute">
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<b>菜单</b><br />
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<a href="//www.w3xue.com">W3xue</a><br />
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<a href="http://www.microsoft.com">Microsoft</a><br />
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<a href="http://www.altavista.com">Altavista</a><br />
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</span>
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 运行结果 
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