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分享淘宝网向下拖动时，会有一个信息栏在顶部，是不是这样实现的？？
发现ie6不支持！！主要用position:fixed,不淘宝网和京东那些网站，是不是这样实现的。
向下拖动的时候，信息头部会在顶部。
向下拖动的时候，信息头部会在顶部。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>测试</title>
</head>
<body>
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<hr />
<div style="height:999999px;">
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fasdf
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fasdf
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<div style="text-align:center;background:#F00;" id="aaa">滚动条向下拖动，我会在顶部</div>
fasdfasdfadsffasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdfadsffasdf
<div style="text-align:center;background:#0f0;" id="bbb">测试一下，这是第二个。。。。</div>
fasdfasdfadsffasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasdf
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fasd</div>
<script type="text/javascript">
var aa=document.getElementById("aaa").offsetTop;
var bb=document.getElementById("bbb").offsetTop;
window.onscroll=function()
{
var ww=document.documentElement.scrollTop || document.body.scrollTop;
if(ww>aa)
{
document.getElementById("aaa").style.position="fixed";
document.getElementById("aaa").style.left="0";
document.getElementById("aaa").style.top="0";
document.getElementById("aaa").style.width="100%";
} else {
document.getElementById("aaa").style.position="static";
}
if(ww>bb)
{
document.getElementById("bbb").style.position="fixed";
document.getElementById("bbb").style.left="0";
document.getElementById("bbb").style.top="0";
document.getElementById("bbb").style.width="100%";
} else {
document.getElementById("bbb").style.position="static";
}
}
</script>
</body>
</html>
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