div屏幕居中

来源：互联网发布：表格2003筛选重复数据编辑：程序博客网时间：2024/05/04 03:26

<!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=gb2312" />
<title>Div+CSS实现始终居中的半透明弹出层</title>
<style type="text/css">
<!--
html,body {height:100%; margin:0px; font-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: 100%;
    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: #666; display: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);
}
.popIframe {
  filter:alpha(opacity=0);/*IE*/
  opacity:0;/*FF*/
}
-->
</style>

</head>
<body>
<div id="popDiv" class="mydiv" style="display:none;">gggggggggggggggggggggggg

<br><a href="javascript:closeDiv()">关闭窗口</a></div>
<div id="bg" class="bg" style="display:none;"></div>
<div style="height:2000px;width:100%;"><br><br>00</div>
<div>
<a href="javascript:showDiv()">点击这里弹出层</a>
</div>
<iframe id='popIframe' class='popIframe' frameborder='0' ></iframe>
</body>
</html>