<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>弹出层效果</title>
<link rel="stylesheet" type="text/css" href="tanchu.css"/>
<script src="tanchu.js" type="text/javascript"></script>
</head>
<body>
<div id="mask">
</div>
<div id="login">
<div id="loginCon" class="loginCon">
<div id="close">
</div>
</div>
</div>
</body>
</html>
#mask{
position: absolute;
background: #000000;
opacity: 0.75;
filter: alpha(opacity=75);
height: 1000px;
width: 100%;
left: 0;
top: 0;
z-index: 1000;
}
#login{
position: fixed;
left: 30%;
top:30%;
z-index: 1020;
}
.loginCon{
width: 670px;
height: 380px;
background: blue;
position: relative;
}
#close{
display: block;
width: 30px;
height: 30px;
background: #CCCCCC;
cursor: pointer;
position: absolute;
top:10px;
right: 10px;
}
window.onload=function(){
var oBtn=document.getElementById("btnLogin")
var sHeight=document.documentElement.scrollHeight;
var sWidth=document.documentElement.scrollWidth;
alert(sWidth);
alert(sHeight);
var oMask=document.createElement("div");
oMask.id="mask";
}