移动端rem布局js设置

(function  () {        setRem();        window.addEventListener('orientation' in window?"deviceorientation":"resize",setRem);        function setRem () {            var html = document.documentElement;            var width = html.clientWidth;            html.style.fontSize = width/16 + 'px';            //假如页面宽为320px，则1rem为320/16px        }    })();