如何实现移动端rem适配
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />//需要这句适配的话
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
#box{
width: 7.5rem;
height: 7.5rem;
background: red;
} </style>
</head>
<body>
<div id="box"></div>
</body>
<script type="text/javascript">
//获取屏幕宽度
var width = document.documentElement.clientWidth; //获取html
var htmlNode = document.querySelector('html'); //设置html字体大小
htmlNode.style.fontSize = width/7.5 + 'px'; </script>
</html>
10.背景图片距离
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title> <style type="text/css">
* {
margin: 0;
padding: 0;
} #box{
width: 100px;
height: 200px;
background: pink;
padding: 100px;
border: 80px solid blue;
background-image: url("img/1.png");
background-repeat: no-repeat;
background-origin: content-box;
background-position: -50px 0;
} /*答案：130px*/
</style>
</head>
<body>
<div id="box"></div>
</body>
</html>