REM适配js

try{
var docEl = document.documentElement,
resizeEvt = ‘orientationchange‘ in window ? ‘orientationchange‘ : ‘resize‘,
recalc = function () {
var clientWidth = docEl.clientWidth;
if (!clientWidth) return;
if(clientWidth>=750){
docEl.style.fontSize = ‘100px‘;
}else{
docEl.style.fontSize = 100 * (clientWidth / 750) + ‘px‘;
}
};

if (document.addEventListener){
window.addEventListener(resizeEvt, recalc, false);
document.addEventListener(‘DOMContentLoaded‘, recalc, false);
}
} catch (e) {}

REM适配js

原文：http://www.cnblogs.com/sure2016/p/6626099.html