本文實例講述了JS+CSS實現Div彈出窗口同時背景變暗的方法。分享給大家供大家參考。具體實現方法如下：
代碼如下:<html>
<head>
<title>JS+CSS實現的Div彈出窗口，同時背景變暗</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="彈出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>
<!-- 浮層框架開始 -->
<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 width="540" height="300" border="0" 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;" height="10" valign="middle">
<div align="right"><a href=JavaScript:; class="STYLE1" onclick="Lock_CheckForm(this);">[關閉]</a> </div></td>
</tr>
<tr>
<td height="130" align="center">
<br><br><hr><p align="center"><font color=red>本特效收集於互聯網，只為興趣與學習交流，不作商業用途。來源：博客園</font></p>
</td>
</tr>
</table>
</div>
<!-- 浮層框架結束-->
</body>
</html>
希望本文所述對大家的javascript程序設計有所幫助。