废话不多说，直接看代码。
目录和文件
├── css
│ ├── style.css (style.scss打包后生成)
│ └── style.css.map
├── index.html
└── scss
└── style.scss
index.html结构
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<title>Document</title>
<script>
var pageWidth = window.innerWidth
document.write(`<style>html{font-size:${pageWidth}px;}</style>`)
</script>
<link rel="stylesheet" href="./css/style.css">
</head>
<body>
<div class="parent clearfix">
<div class="child">box</div>
<div class="child">box</div>
<div class="child">box</div>
<div class="child">box</div>
</div>
</body>
</html>
/scss/style.scss源码
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-size: 16px;
}
$designWidth: 1000;
@function px2rem($px) {
@return $px/$designWidth+rem;
}
.child {
background: #ddd;
width: px2rem(400);
height: px2rem(200);
margin: px2rem(50) px2rem(50);
border: 1px solid #000;
float: left;
font-size: 1.2em;
}
.clearfix::after {
content: '';
display: block;
clear: both;
}
