本文实例讲述了JS+CSS实现Div弹出窗口同时背景变暗的方法。分享给大家供大家参考。具体实现方法如下：
复制代码代码如下:<html>
<head>
<title>JS+CSS实现的Div弹出窗口，同时背景变暗</title>
<script>
function locking(){
document.all.ly.style.display="block";
document.all.ly.style.width=document.body.clientWidth;
document.all.ly.style.height=document.body.clientHeight;
document.all.Layer2.style.display='block';
}
function Lock_CheckForm(theForm){
document.all.ly.style.display='none';document.all.Layer2.style.display='none';
return false;
}
</script>
<style type="text/css">
<!--
.STYLE1 {font-size: 12px}
a:link {
color: #000;
text-decoration: none;
}
a:visited {
text-decoration: none;
}
a:hover {
text-decoration: none;
}
a:active {
text-decoration: none;
}
-->
</style>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<p align="center">
<input type="button" value="弹出DIV" onClick="locking()" />
</p>
<div id="ly" style="position: absolute; top: 0px; filter: alpha(opacity=60); background-color: #777;
z-index: 2; left: 0px; display: none;">
</div>
<!-- 浮层框架开始 -->
<div id="Layer2" align="center" style="position: absolute; z-index: 3; left: expression((document.body.offsetWidth-540)/2); top: expression((document.body.offsetHeight-170)/10);
background-color: #fff; display: none;" >
<table cellpadding="0" cellspacing="0" style="border: 0 solid #e7e3e7;
border-collapse: collapse ;" >
<tr>
<td style="background-color: #73A2d6; color: #fff; padding-left: 4px; padding-top: 2px;
font-weight: bold; font-size: 12px;" valign="middle">
<div align="right"><a href=JavaScript:; onclick="Lock_CheckForm(this);">[关闭]</a> </div></td>
</tr>
<tr>
<td align="center">
<br><br><hr><p align="center"><font color=red>本特效收集于互联网，只为兴趣与学习交流，不作商业用途。来源：武林网</font></p>
</td>
</tr>
</table>
</div>
<!-- 浮层框架结束-->
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。