1.table布局
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>垂直居中1</title>
<style type="text/css">
table{
height:500px;
}
</style>
</head>
<body>
<div>
<table border="1">
<tr>
<td>
<div>
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaav
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaav
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaav
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaav
</div>
</td>
</tr>
</table>
</div>
</body>
</html>
- display:table-cell
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>垂直居中2</title>
<style type="text/css">
.div1{
display:table-cell;
vertical-align: middle;
border:1px solid red;
height:500px;
}
.div2{
width:100px;
height:100px;
background-color: #191919;
}
</style>
</head>
<body>
<div class="div1">
<div class="div2">阿斯达谁</div>
</div>
</body>
</html>
3.父级相对定位，子级绝对定位
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;padding: 0;
}
.div1{
width:400px;
height:400px;
border:2px solid red;
position: relative;
}
.div2{
width:100px;
height: 100px;
background-color: black;
margin: auto;
position: absolute;
top: 0px;
left: 0px;
right: 0px;
bottom: 0px;
}
</style>
</head>
<body>
<div class="div1">
<div class="div2"></div>
</div>
</body>
</html>
1.table margin:0 auto
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>水平居中1</title>
<style>
*{
margin:0;
padding:0;
}
table{
margin: 0 auto;
}
td{
border:1px solid red;
}
li{
list-style-type: none;
}
</style>
</head>
<body>
<table>
<tr>
<td>
<ul>
<li>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</li>
<li>baaaaa</li>
<li>caaaaaa</li>
</ul>
</td>
</tr>
</table>
</body>
</html>
2.相对定位left 50%
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> <!--定义字符编码gb2312 GBK-->
<meta name="keywords" content="百度,搜索器,爬虫,搜索引擎"/>
<meta name="description" content="百度网是一个什么都可以找到的网站"/>
<meta name="author" content="作者"/>
<meta name="copyright" content="声明 版本"/> <!--定义网页的基本信息-->
<title>百度一下，你就知道</title> <!--定义网页的标题-->
<link /> <!--导入外部CSS文件-->
<style type="text/css">
*{
margin:0;
padding:0;
}
.d1{
display: inline-block;
position:relative;
left:50%;
border:1px solid red;
}
.d1 ul{
border:1px solid black;
float: left;
position:relative;
left:-50%;
}
.d1 li{
float:left;
list-style:none;
}
</style> <!--定义CSS样式-->
<script></script> <!--定义脚本语言JS Jquery-->
<!--<meta http-equiv="refresh" content="3;url=http://www.baidu.com">-->
</head>
<body>
<div class="d1">
<ul>
<li>aaaaaaaaaaaa</li>
<li>bbbbb</li>
<li>ccccc</li>
</ul>
</div>
</body>
</html>