两种方式
1、width与padding-bottom实现，兼容性强
2、aspect-ratio现在浏览器兼容，老浏览器不兼容
两则的示例代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<style>
.container {
position: relative;
width: 100%;
padding-bottom: 50%; /* 宽高比为2:1 */
}
.inner {
background: green;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
.container2 {
width: 100%;
aspect-ratio: 16 / 9; /* 设置宽高比 */
}
.inner2 {
background: yellow;
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<div class="container">
<div class="inner">
111
</div>
</div>
<div class="container2">
<div class="inner2">
222
</div>
</div>
</body>
</html>
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