<html>
<head>
<meta charset="utf-8">
<script>
console.log(window.devicePixelRatio);
var iScale = 1;
iScale = iScale/window.devicePixelRatio;
document.write(‘<meta name="viewport" content="width=device-width,user-scable=no,initial-scale=‘ + iScale + ‘,minimum-scale=‘ + iScale + ‘,maximum-scale=‘ + iScale + ‘"/>‘);
//console.log(document.documentElement.clientWidth);
var iWidth = document.documentElement.clientWidth/16;
document.getElementsByTagName(‘html‘)[0].style.fontSize = iWidth + ‘px‘;
</script>
</head>
</html>
原文：https://www.cnblogs.com/dayin1/p/10964627.html