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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<!-- delclare meta elements -->
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>JavaScript Syntax Highlighter</title>
<style type="text/css">
#layer {
position:absolute; width: 400px; height: 200px; background-color: red
}
</style>
</head>
<body>
<div id="layer" style="left: 0px; top:0px"></div>
<script type="text/javascript">
window.onload = window.onresize = window.onscroll = function() {
var doc = document,
layer = doc.getElementById('layer'),
clientWidth = window.innerWidth/*W3C*/|| doc.documentElement.clientWidth/*std IE*/||doc.body.clientWidth/*IE quirk mode*/,
clientHeight = window.innerHeight || doc.documentElement.clientHeight || doc.body.clientHeight;
layer.style.left = Math.round((clientWidth - layer.offsetWidth) / 2) + 'px';
layer.style.top = Math.round((clientHeight - layer.offsetHeight) / 2) + 'px';
};
</script>
</body>
</html>
<div style="height:1000px;"></div>
<div><input type="button" onclick="alert(document.documentElement.scrollTop)" value="show document.documentElement.scrollTop" />
<input type="button" onclick="alert(document.documentElement.scrollTop)" value="show document.body.scrollTop" />
</div>
<script type="text/javascript">
var docEle = function()
{
return document.getElementById(arguments[0]) || false;
}
function openNewDiv(_id)
{
var m = "mask";
if (docEle(_id)) document.body.removeChild(docEle(_id));
if (docEle(m)) document.body.removeChild(docEle(m));
//mask遮罩层
var newMask = document.createElement("div");
newMask.id = m;
newMask.style.position = "absolute";
newMask.style.zIndex = "1";
_scrollWidth = Math.max(document.body.scrollWidth,document.documentElement.scrollWidth);
_scrollHeight = Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);
newMask.style.width = _scrollWidth + "px";
newMask.style.height = _scrollHeight + "px";
newMask.style.top = "0px";
newMask.style.left = "0px";
newMask.style.background = "#33393C";
newMask.style.filter = "alpha(opacity=40)";
newMask.style.opacity = "0.40";
document.body.appendChild(newMask);
//新弹出层
var newDiv = document.createElement("div");
newDiv.id = _id;
newDiv.style.position = "absolute";
newDiv.style.zIndex = "9999";
newDivWidth = 400;
newDivHeight = 200;
newDiv.style.width = newDivWidth + "px";
newDiv.style.height = newDivHeight + "px";
newDiv.style.top = (document.body.scrollTop + document.body.clientHeight/2 - newDivHeight/2) + "px";
newDiv.style.left = (document.body.scrollLeft + document.body.clientWidth/2 - newDivWidth/2) + "px";
newDiv.style.background = "#EFEFEF";
newDiv.style.border = "1px solid #860001";
newDiv.style.padding = "5px";
newDiv.innerHTML = " ";
document.body.appendChild(newDiv);
//弹出层滚动居中
function newDivCenter()
{
newDiv.style.top = (document.body.scrollTop + document.body.clientHeight/2 - newDivHeight/2) + "px";
newDiv.style.left = (document.body.scrollLeft + document.body.clientWidth/2 - newDivWidth/2) + "px";
}
if(document.all)
{
window.attachEvent("onscroll",newDivCenter);
}
else
{
window.addEventListener('scroll',newDivCenter,false);
}
//关闭新图层和mask遮罩层
var newA = document.createElement("div");
newA.innerHTML ="取消";
var newB = document.createElement("TEXTAREA");
newB.setAttribute("cols","40");
newB.setAttribute("rows","10");
newA.onclick = function(){
if(document.all)
{
window.detachEvent("onscroll",newDivCenter);
}
else
{
window.removeEventListener('scroll',newDivCenter,false);
}
document.body.removeChild(docEle(_id));
document.body.removeChild(docEle(m));
return false;
}
newDiv.appendChild(newB);
newDiv.appendChild(newA);
}
</script>
<body>
<a onclick="openNewDiv('newDiv');return false;" style="cursor:pointer">弹出层</a>
<br><br><br><br><br><br><br><br><br><br><br><br><br><br>
</body>