DIV垂直居中
第一种方法:
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<style type="text/css">
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<!--
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#middle
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{
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background:blue;
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position:absolute;
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left:expression((body.clientWidth-50)/2 + "px");
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top:expression((body.clientHeight-50)/2 + "px");
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width:50px;
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height:50px;
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}
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-->
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</style>
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<div id="middle" align="absmiddle"></div> <!--absmiddle 图像的中间与同一行中最大元素的中间对齐。
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-->
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
说明:这段代码没有文档类型和命名空间的申明,我已试过,如果加上,蓝色方快儿将位于顶部且一部分被浏览器隐藏,大家可以试试!此外,FF不支持expression
第二种方法:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
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<title>DIV垂直居中</title>
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<style type="text/css">
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#menu
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{
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position: absolute;
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top: 50%;
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left: 50%;
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margin-top: -25px;
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margin-left: -150px;
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color:blue;
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width: 300px;
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height: 50px;
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border:solid 1px gray;
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}
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</style>
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</head>
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<body>
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<div id=menu>页面水平垂直居中</div>
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</body>
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</html>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
第三种方法:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
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<title>DIV垂直居中</title>
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<style type="text/css">
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#menu
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{
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position: absolute;
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top: 50%;
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left: 50%;
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margin-top: -25px;
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margin-left: -150px;
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color:blue;
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width: 300px;
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height: 50px;
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font-weight:bold;
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border:solid 1px gray;
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line-height:50px;
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font-size:20px;
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text-align:center;
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}
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</style>
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</head>
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<body>
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<div id=menu>页面水平垂直居中</div>
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</body>
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</html>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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