<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.jb51.net/" />
<title>CSS如何实现弹出一个全屏灰黑色透明遮罩效果-脚本之家</title>
<style type="text/css">
*
{
margin:0px;
padding:0px;
}
.zhezhao
{
width:100%;
height:100%;
background-color:#000;
filter:alpha(opacity=50);
-moz-opacity:0.5;
opacity:0.5;
position:absolute;
left:0px;
top:0px;
display:none;
z-index:1000;
}
.login
{
width:280px;
height:180px;
position:absolute;
top:200px;
left:50%;
background-color:#000;
margin-left:-140px;
display:none;
z-index:1500;
}
.content
{
margin-top:50px;
color:red;
line-height:200px;
height:200px;
text-align:center;
}
</style>
<script type="text/javascript">
window.onload=function()
{
var zhezhao=document.getElementById("zhezhao");
var login=document.getElementById("login");
var bt=document.getElementById("bt");
var btclose=document.getElementById("btclose");
bt.onclick=function()
{
zhezhao.style.display="block";
login.style.display="block";
}
btclose.onclick=function()
{
zhezhao.style.display="none";
login.style.display="none";
}
}
</script>
</head>
<body>
<div class="zhezhao" id="zhezhao"></div>
<div class="login" id="login"><button id="btclose">点击关闭</button></div>
<div class="content">脚本之家欢迎您，<button id="bt">点击弹出遮罩</button></div>
</body>
</html>