代码语言：javascript复制
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
/*继承是通过并集选择器, 不会拷贝只会保留一份*/
/* .center
{
position: 50%;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}
.father
{
@extends .center;
width: 300px;
height: 300px;
background: red;
.son
{
@extends .center;
width: 200px;
height: 200px;
background: blue;
}
}*/
.center, .father .son, .father {
position: 50%;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
.father {
width: 300px;
height: 300px;
background: red;
}
.father .son {
width: 200px;
height: 200px;
background: blue;
}
</style>
</head>
<body>
<div class="father">
<div class="son"></div>
</div>
</body>
</html>
