absolute和relative分别依据什么定位？
- relative依据自身定位
- absolute依据最近一层的定位元素定位，如果上层没有定位元素，则依据
body定位
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.relative{
position: relative;
width: 400px;
height: 200px;
border: 1px solid #ccc;
top: 20px;
left: 50px;
}
.absolute{
position: absolute;
width: 200px;
height: 100px;
border: 1px solid blue;
top: 20px;
left: 50px;
}
</style>
</head>
<body>
<p>absolute 和 relative 定位问题</p>
<div class="relative">
<div class="absolute">
this is absolute
</div>
</div>
</body>
</html>
效果
![[附源码]计算机毕业设计JAVA航空售票管理系统](https://img-blog.csdnimg.cn/8854c5c55627409b8f372d0306cacfc4.png)
