【js练习七】弹出层效果

<!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>弹出层效果</title>
<style>
html,body{height:100%;overflow:hidden;}
body,div,h2{margin:0;padding:0;}
body{font:12px/1.5 Tahoma;}
center{padding-top:10px;}
button{cursor:pointer;}
#overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#000;opacity:0.5;filter:alpha(opacity=50);display:none;}
#win{position:absolute;top:50%;left:50%;width:400px;height:200px;background:#fff;border:4px solid #f90;margin:-102px 0 0 -202px;display:none;}
h2{font-size:12px;text-align:right;background:#FC0;border-bottom:3px solid #f90;padding:5px;}
h2 span{color:#f90;cursor:pointer;background:#fff;border:1px solid #f90;padding:0 2px;}
</style>
<script>
window.onload = function(){
var btn = document.getElementsByTagName(“button”)[0];
var win = document.getElementById(“win”);
var lav = document.getElementById(“overlay”);

btn.onclick = function(){
win.style.display = “block”;
lav.style.display = “block”;
}
var close =document.getElementById(“close”);
close.onclick = function(){
win.style.display = “none”;
lav.style.display = “none”
}
}
</script>
</head>
<body>
<div id=”overlay”></div>
<div id=”win”><h2><span id=”close”>×</span></h2></div>
<center><button>弹出层</button></center>
</body>
</html>

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