登陆高档弹窗的制作原理代码：
<!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>无标题文档</title>
<style type="text/css">
#tanchuang{
width:600px;
height:450px;
margin-left:-300px; /*设置为宽度的一半*/
margin-top:-225px; /*设置为高度的一半*/
background:#FFF; /*弹窗背景色*/
left:50%;
top:50%;
display: none; /*弹窗默认不显示*/
border:8px solid #999; /*弹窗边框*/
position: absolute;z-index:1002;
}
#tanchuang .donglutitle{
height:90px;
background:#CCC;
float:left;
width:100%;
line-height:90px;
color: #333333;
font-family: '微软雅黑';
font-size: 26px;
font-weight: normal;}
.close_css{
display: none;
position: absolute;
top: 0%;
left: 0%;
width: 100%;
height: 100%;
background-color: #000; /*弹窗遮照层色*/
z-index:1001;
filter:alpha(opacity=50); /*IE滤镜，透明度50%*/
-moz-opacity:0.5; /*Firefox私有，透明度50%*/
opacity:0.5;/*其他，透明度50%*/
}
</style>
</head>
<body>
<a href="javascript:void(0)" onclick = "document.getElementById('tanchuang').style.display='block';document.getElementById('close').style.display='block'">会员注册</a>
<!--弹窗框开始-->
<div id="tanchuang">
<div class="donglutitle">会员登陆</div>
<a href="javascript:void(0)" onclick = "document.getElementById('tanchuang').style.display='none';document.getElementById('close').style.display='none'">点我关闭</a><br/>
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</div>
<!--弹窗框结束-->
<!--弹窗后面灰色遮照层样式开始-->
<div id="close" class="close_css"></div>
<!--弹窗后面灰色遮照层样式结束-->
</body>
</html>
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