<!DOCTYPE html>
<html lang="cn">
<head>
<meta charset="utf-8" />
<meta id="viewport" name="viewport" content="width=device-width,height=device-height,user-scalable=no, initial-scale=1.0,minimum-scale=1.0, maximum-scale=1.0">
<title>h5自适应</title>
<script>
var bw = (document.documentElement.clientWidth / 7.5) + "px";
var htmlTag = document.getElementsByTagName("html")[0];
htmlTag.style.fontSize = bw;
</script>
<style>
*{margin: 0;padding: 0;}
h1{
text-align: center;
width: 7.5rem;
font-size: .36rem;
}
</style>
</head>
<body>
<h1>经过计算可得：750px == 7.5rem</h1>
</body>
</html>
