javascript用DIV模拟弹出窗口_窗体滚动跟随

<!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" lang="zh-CN"> 
<head> 
<title>可滚动跟随弹出框效果代码——phpStudy</title> 
<script> 
function getPosition() { 
var top = document.documentElement.scrollTop; 
var left = document.documentElement.scrollLeft; 
var height = document.documentElement.clientHeight; 
var width = document.documentElement.clientWidth; 
return {top:top,left:left,height:height,width:width}; 
}

function showPop(){ 
var width = 300; //弹出框的宽度 
var height = 160; //弹出框的高度 
var obj = document.getElementById("pop");

obj.style.display = "block"; 
obj.style.position = "absolute"; 
obj.style.zindex = "999"; 
obj.style.width = width + "px"; 
obj.style.height = height + "px";

var Position = getPosition(); 
leftadd = (Position.width-width)/2; 
topadd = (Position.height-height)/2; 
obj.style.top = (Position.top + topadd) + "px"; 
obj.style.left = (Position.left + leftadd) + "px";

window.onscroll = function (){ 
var Position = getPosition(); 
obj.style.top = (Position.top + topadd) +"px"; 
obj.style.left = (Position.left + leftadd) +"px"; 
}; 
}

function hidePop(){ 
document.getElementById("pop").style.display = "none"; 
} 
</script> 
</head> 
<body> 
作者：丁学－－滚动跟随 
<div id="pop" style="border:1px solid #CCC;display:none;">test hide</div> 
 
show 
 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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