<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.box{
width: 400px;height: 400px;
border: 1px solid red;
display: flex;/*设置为伸缩的父元素*/
}
.dv1{
width: 100px;height: 100px;/*宽度无效*/
background: red;
flex: 2;
}
.dv2{
width: 100px;height: 100px;/*宽度无效*/
background: blue;
flex: 2;
}
.dv3{
width: 100px;height: 100px;/*宽度无效*/
background: yellow;
flex: 1;
}
</style>
</head>
<body>
<div class="box">
<div class="dv1"></div>
<div class="dv2"></div>
<div class="dv3"></div>
</div>
</body>
</html>
主要是用:
display:flex;
flex:1;/*宽度无效*/