移动端布局,div并列布局永远是正方形，宽度不指定
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, inital-scale=1.0">
<title>Document</title>
<style>
.container{
width: 400px; /*宽度自适应*/
height: 600px;
border: 1px solid red;
}
.inner{
position: relative;
width: 100%;
padding-bottom: 50%;
}
.box{
position: absolute;
width: 100%;
height: 100%;
}
.wrapper:nth-child(odd){
width: 50%;
height: 100%;
background-color: blueviolet;
float: left;
}
.wrapper:nth-child(even){
width: 50%;
height: 100%;
background-color: blue;
float: left;
}
</style>
</head>
<body>
<div class="container">
<div class="inner">
<div class="box">
<div class="wrapper"></div>
<div class="wrapper"></div>
</div>
</div>
</div>
</body>
巧妙使用
padding-bottom来撑高度，padding的百分比相对于父级的width来计算的，然后在通过position相对定位撑开高度
