<!DOCTYPE html>
<html lang="en">
<head>
<title></title>
<meta charset="utf-8">
<style type="text/css">
*{
margin: 0;
padding: 0;
}
body{
height: 2000px;
}
.mask{
width: 100%;
height: 100%;
background-color: #555;
opacity: 0.5;
position: fixed;
top: 0;
left: 0;
display: none;
}
.login{
width: 400px;
height: 300px;
background-color: #fff;
position: fixed;
top: 50%;
left: 50%;
margin-top: -150px;
margin-left: -200px;
display: none;
}
</style>
</head>
<body>
<a href="javascript:void(0)" id="btnLogin">登录</a>
<div class="mask" id="maskDiv"></div>
<div class="login" id="loginDiv"></div>
<script type="text/javascript">
var link = document.getElementById('btnLogin');
var mDiv = document.getElementById('maskDiv');
var lDiv = document.getElementById('loginDiv');
link.onclick = function(event){
var evt = event || window.event;
var target = event.target || event.srcElement;
if(target.id == this.id){
mDiv.style.display = 'block';
lDiv.style.display = 'block';
document.body.style.overflow = 'hidden';
}
evt.stopPropagation (); // cancel event bubbling
}
document.onclick = function(event){
var evt = event || window.event;
var target = event.target || event.srcElement;
if(target.id != 'loginDiv'){
mDiv.style.display = 'none';
lDiv.style.display = 'none';
}
}
</script>
</body>
</html>