把你登录的id和密码还有下边的按钮放到一个div里,给这个div设置margin:0 auto就居中了。
这个其实很简单的,只要添加一条
标签就能让其居中 这个是html5的标签,兼容性不好,还是用div+css2吧。
<!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" mrc="text/htmlcharset=gb2312" />
<title>始终居中的d出层- www.mb5u.com</title>
<style type="text/css">
<!--
html,body {height:100%margin:0pxfont-size:12px}
.mydiv {
background-color: #FFCC66
border: 1px solid #f00
text-align: center
line-height: 40px
font-size: 12px
font-weight: bold
z-index:999
width: 300px
height: 120px
left:50%
top:50%
margin-left:-150px!important/*FF IE7 该值为本身宽的一半 */
margin-top:-60px!important/*FF IE7 该值为本身高的一半*/
margin-top:0px
position:fixed!important/* FF IE7*/
position:absolute/*IE6*/
_top: expression(eval(document.compatMode &&
document.compatMode=='CSS1Compat') ?
documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2)/*IE5 IE5.5*/
}
.bg,.popIframe {
background-color: #666display:none
width: 100%
height: 100%
left:0
top:0/*FF IE7*/
filter:alpha(opacity=50)/*IE*/
opacity:0.5/*FF*/
z-index:1
position:fixed!important/*FF IE7*/
position:absolute/*IE6*/
_top: expression(eval(document.compatMode &&
document.compatMode=='CSS1Compat') ?
documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2)/* www.mb5u.com IE5 IE5.5*/
}
.popIframe {
filter:alpha(opacity=0)/*IE*/
opacity:0/*FF*/
}
-->
</style>
<script language="javascript" type="text/javascript">
function showDiv(){
document.getElementById('popDiv').style.display='block'
document.getElementById('popIframe').style.display='block'
document.getElementById('bg').style.display='block'
}
function closeDiv(){
document.getElementById('popDiv').style.display='none'
document.getElementById('bg').style.display='none'
document.getElementById('popIframe').style.display='none'
}
</script>
</head>
<body>
<div id="popDiv" class="mydiv" style="display:none">网页设计大本营欢迎你!<br/>Q群号:29032448<br/>
<a href="javascript:closeDiv()">关闭窗口</a></div>
<div id="bg" class="bg" style="display:none"></div>
<a href="javascript:showDiv()">点击这里d出层</a>
<iframe id='popIframe' class='popIframe' frameborder='0' ></iframe>
</body>
</html>
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