广州seo小雨第一种：全CSS控制，层漂浮（适用于做登陆页面）
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<%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%>
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
<html>
<head>
<title>My JSP</title>
<meta http-equiv=”pragma” content=”no-cache”>
<meta http-equiv=”cache-control” content=”no-cache”>
<meta http-equiv=”expires” content=”0″>
<meta http-equiv=”keywords” content=”keyword1,keyword2,keyword3″>
<meta http-equiv=”description” content=”This is my page”>
<style type=”text/css”>
#divcenter{
position:absolute;/*层漂浮*/
top:50%;
left:50%;
width:300px;
height:300px;
margin-top:-150px;/*注意这里必须是DIV高度的一半*/
margin-left:-150px;/*这里是DIV宽度的一半*/
background:yellow;
border:1px solid red; }
</style>
</head>
<body>
<div> this is a test </div>
</body>
</html>
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<%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%>
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
<html>
<head>
<title>My JSP</title>
<meta http-equiv=”pragma” content=”no-cache”>
<meta http-equiv=”cache-control” content=”no-cache”>
<meta http-equiv=”expires” content=”0″>
<meta http-equiv=”keywords” content=”keyword1,keyword2,keyword3″>
<meta http-equiv=”description” content=”This is my page”>
<script type=”text/javascript”>
function cen(){
var divname = document.all(“testdiv”);
// 居中 高度等于页面内容高度减去DIV的高度 除以2
var topvalue = (document.body.clientHeight – divname.clientHeight)/2;
divname.style.marginTop = topvalue;
}
//页面大小发生变化时触发
window.onresize = cen;
</script>
</head>
<body onload=cen()>
<div id = “testdiv”>
DIV居中演示
</div>
</body>
</html>
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<div></div>
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<html>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=gb2312″ />
<title></title>
<style type=”text/css”>
.img_v {
display:table-cell !important;
display:block;
position:static !important;
position:relative;
overflow:hidden;
width:400px;
height:400px;
border:1px solid #000;
vertical-align:middle;
text-align:center;
}
.img_v p {
display:table-cell !important;
display:block;
margin:0;
position:static !important;
position:absolute;
top:50%;
left:50%;
width:400px;
margin-left:auto;
margin-right:auto;
}
.img_v img {
position:static !important;
position:relative;
top:auto !important;
top:-50%;
left:auto !important;
left:-50%;
}
</style>
</head>
<body>
<div>
<p><img src=””></p>
</div>
</body>
</html>