<!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=gb2312" />
<title>无标题文档</title>
<style type="text/css">
#div1{width:1600px;}#div2{position:absolute;left:20px;top:600px; background:red; width:100px;height:100px; float:left}</style>
</head><body>
<div id="div1">-</div>
<div id="div2"></div></body>
</html>
<script type="text/javascript">var elem = document.getElementById("div2");var left = posX(elem);var x ; window.onscroll = function()
{
x = left + scrollX();
setX(elem,x);}function getStyle( elem, name ) { if (elem.style[name])
return elem.style[name]; else if (elem.currentStyle)
return elem.currentStyle[name]; else if (document.defaultView && document.defaultView.getComputedStyle) {
name = name.replace(/([A-Z])/g,"-$1");
name = name.toLowerCase();
var s = document.defaultView.getComputedStyle(elem,"");
return s && s.getPropertyValue(name); } else
return null;
}function posX(elem) {
return parseInt( getStyle( elem, "left" ) );
}function setX(elem, pos) { elem.style.left = pos + "px";
}function scrollX() { var de = document.documentElement; return self.pageXOffset ||
( de && de.scrollLeft ) ||
document.body.scrollLeft;
}</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
#div1{width:1600px;}#div2{position:absolute;left:20px;top:600px; background:red; width:100px;height:100px; float:left}</style>
</head><body>
<div id="div1">-</div>
<div id="div2"></div></body>
</html>
<script type="text/javascript">var elem = document.getElementById("div2");var left = posX(elem);var x ; window.onscroll = function()
{
x = left + scrollX();
setX(elem,x);}function getStyle( elem, name ) { if (elem.style[name])
return elem.style[name]; else if (elem.currentStyle)
return elem.currentStyle[name]; else if (document.defaultView && document.defaultView.getComputedStyle) {
name = name.replace(/([A-Z])/g,"-$1");
name = name.toLowerCase();
var s = document.defaultView.getComputedStyle(elem,"");
return s && s.getPropertyValue(name); } else
return null;
}function posX(elem) {
return parseInt( getStyle( elem, "left" ) );
}function setX(elem, pos) { elem.style.left = pos + "px";
}function scrollX() { var de = document.documentElement; return self.pageXOffset ||
( de && de.scrollLeft ) ||
document.body.scrollLeft;
}</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
#div1{width:1600px;}#div2{position:fixed;left:20px;top:600px; background:red; width:100px;height:100px; float:left}
</style>
</head>
<body>
<div id="div1">-</div>
<div id="div2"></div>
</body>
</html>
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这个更简单,不过ie6不支持.firefox可以
如果用第一种兼容所有浏览器的定位方式,肯定会出现抖动
第2种方式则不会,当然这样要放弃ie6的用户.
另外上面写在样式里的float:left都可以去掉
不用兼容太多的浏览器，IE6.0支持就可以，主要为ie的用户。