移动端rem布局之common.js

js代码：

(function(){    var num=1/window.devicePixelRatio;    document.write('<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale='+num+', maximum-scale='+num+', minimum-scale='+num+'">');    var fontSize=document.documentElement.clientWidth/10;    document.querySelector('html').style.fontSize=fontSize+'px';})();