除了用vw之外！！
2 回答
一只斗牛犬
TA贡献1784条经验 获得超2个赞
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
.box{
width: 70%;
position:relative;
}
.box:before{
content: '';
padding-top: 100%;
box-sizing: border-box;
display: block;
width: 0;
}
.pox{
position:absolute;
height:100%;
width:100%;
left: 0;
top: 0;
border: 1px solid red;
box-sizing: border-box;
}
</style>
</head>
<body>
<div class="box">
<div class="pox">11111</div>
</div>
</body>
</html>
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