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js遮罩层效果

2011-08-29 16:21 441 查看
<!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=utf-8" />
<title>mask</title>
<style type="text/css">
#newDiv
{

}
</style>
</head>
<body>

<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=10)";
newMask.style.opacity = "0.20";
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 = "弹出层内容 ";
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("a");
newA.href = "#";
newA.innerHTML = "关闭";
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(newA);
}
</script>

<body>
<a style="cursor: pointer">点击弹出遮罩层</a>
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</body>
<script type="text/javascript">
openNewDiv('newDiv');
</script>
</html>
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