这个代码是我以前测试时候的代码了，主要用到的知识点是opacity和filer分别实现 “标准浏览器”和IE浏览器下的半透明，使用js的document.body.offsetwidth 和screen.height来控制遮罩层的宽高，通过element.style.display属性来控制 遮罩层显示与否
<!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>HTML遮罩层，背景半透明，只显示中间部分</title>
<style>
#msgDiv {
z-index:10001;
500px;
height:400px;
background:white;
border:#336699 1px solid;
position:absolute;
left:50%;
top:20%;
font-size:12px;
margin-left:-225px;
display: none;
}
#bgDiv {
display: none;
position: absolute;
top: 0px;
left: 0px;
right:0px;
background-color: #777;
filter:progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75);
opacity: 0.6;
}
</style>
<script type="text/javascript" language="javascript">
function showDetail(){//show detail
//msgDiv
var msgDiv = document.getElementById("msgDiv");
msgDiv.style.marginTop = -75 + document.documentElement.scrollTop + "px";
//bgDiv
var bgDiv = document.getElementById("bgDiv");
bgDiv.style.width = document.body.offsetwidth + "px";
bgDiv.style.height = screen.height + "px";
//msgShut
var msgShut = document.getElementById("msgShut");
msgShut.onclick = function(){
bgDiv.style.display = msgDiv.style.display = "none";
}
//content
msgDiv.style.display = bgDiv.style.display = "block";
var msgDetail = document.getElementById("msgDetail");
msgDetail.innerHTML = "<p style='line-height:50px;font-size:30px;text-align:center'>显示框中的内容</p>";
}
</script>
</head>
<body>
<div id="msgDiv">
<div id="msgShut">关闭</div>
<div id="msgDetail"></div>
</div>
<div id="bgDiv"></div>
<p></p>
<p><a href="#" onClick="showDetail()">点击我看看</a></p>
</body>
</html>
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