html 弹出div并移动居中，详细的实现代码如下，感兴趣的朋友不要错过
代码如下:
<!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">
html,body {height:100%; margin:0px; font-size:12px;}
.mydiv {
background-color: #ff6;
border: 1px solid #f90;
text-align: center;
line-height: 40px;
font-size: 12px;
font-weight: bold;
z-index:99;
width: 300px;
height: 120px;
left:50%;
top: 50%;
margin-left:-150px!important;
margin-top:-60px!important;
margin-top:0px;
position:fixed!important;
position:absolute;
_top: expression(eval(document.compatMode &&
document.compatMode=='CSS1Compat') ?
documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :
document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);
}
.bg {
background-color: #ccc;
width: 100%;
height: 100%;
left:0;
top:0;
filter:alpha(opacity=50);
opacity:0.5;
z-index:1;
position:fixed!important;
position:absolute;
_top: expression(eval(document.compatMode &&
document.compatMode=='CSS1Compat') ?
documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :
document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);
}
</style>
<script type="text/javascript">
function showDiv(){
document.getElementById('popDiv').style.display='block';
document.getElementById('bg').style.display='block';
}
function closeDiv(){
document.getElementById('popDiv').style.display='none';
document.getElementById('bg').style.display='none';
}
</script>
</head>
<body>
<div id="popDiv" class="mydiv" style="display:none;">标题<br/>你懂得<br/>
<a href="javascript:closeDiv()">关闭窗口</a></div>
<div id="bg" class="bg" style="display:none;"></div>
<div style="padding-top: 20px;">
<input type="Submit" name="" value="显示层" onclick="javascript:showDiv()" />
</div>
</body>
</html>
附加一个好看的样式
<html>
<head><title></title>
<style>
.mesWindowTop {
font-size: 12px;
font-weight: bold;
text-align: left;
}
.mesWindowContent {
font-size: 12px;
}
.mesWindow {
background: none repeat scroll 0 0 #FFFFFF;
border: 1px solid #666666;
}
</style>
</head>
<body>
<div id="mesWindow" class="mesWindow" style="top: 180px; position: absolute; width: 600px; margin-left: -300px; left: 50%; z-index: 9999;"><div class="mesWindowTop"><table width="100%" height="100%"><tbody><tr><td>窗口标题</td><td style="width:1px;"><input type="button" value="关闭" class="close" title="关闭窗口" onclick="closeWindow();"></td></tr></tbody></table></div><div id="mesWindowContent" class="mesWindowContent"><div style="padding:20px 0 20px 0;text-align:center">消息正文</div></div><div class="mesWindowBottom"></div></div>
</body>
</html>
