弹出层：两种方式，
一是打开网页就自动弹出层
二是点击弹出
<!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>
<title>jQuery简便实现遮罩层--柯乐义</title>
<meta charset="utf-8">
<style>
body {
font-family:Arial, Helvetica, sans-serif;
font-size:12px;
margin:0;
}
#main {
height:1800px;
padding-top:90px;
text-align:center;
}
#fullbg {
background-color:gray;
left:0;
opacity:0.8;
position:absolute;
top:0;
z-index:3;
filter:alpha(opacity=80);
-moz-opacity:0.5;
-khtml-opacity:0.5;
}
#dialog {
background-color:#fff;
border:5px solid rgba(0,0,0, 0.8);
height:400px;
left:50%;
margin:-200px 0 0 -200px;
padding:1px;
position:fixed !important; /* 浮动对话框 */
position:absolute;
top:50%;
width:400px;
z-index:5;
border-radius:5px;
display:none;
}
#dialog p {
margin:0 0 12px;
height:24px;
line-height:24px;
background:#CCCCCC;
}
#dialog p.close {
text-align:right;
padding-right:10px;
}
#dialog p.close a {
color:#fff;
text-decoration:none;
}
</style>
<script type="text/javascript" src="http://keleyi.com/keleyi/pmedia/jquery/jquery-1.10.2.min.js"></script>
<script>
$(document).ready(function(){
showBg();
});
</script>
<script type="text/javascript">
//显示灰色 jQuery 遮罩层
function showBg() {
var bh = $("body").height();
var bw = $("body").width();
$("#fullbg").css({
height:bh,
width:bw,
display:"block"
});
$("#dialog").show();
}
//关闭灰色 jQuery 遮罩
function closeBg() {
$("#fullbg,#dialog").hide();
}
</script>
</head>
<body>
<div id="main"><a href="javascript:showBg();">点击这里查看效果</a>
<div id="fullbg"></div>
<div id="dialog">
<p class="close"><a href="#" onclick="closeBg();">关闭</a></p>
<div>正在加载，请稍后....</div>
</div>
</div>
</body>
</html>