移动端rem.js

 1 (function (doc, win) {
 2         var docEl = doc.documentElement,
 3             resizeEvt = ‘orientationchange‘ in window ? ‘orientationchange‘ : ‘resize‘,
 4             recalc = function () {
 5                 var clientWidth = docEl.clientWidth;
 6                 if (!clientWidth) return;
 7                 // 这里的750 取决于设计稿的宽度
 8                 if (clientWidth >= 750) {
 9                     docEl.style.fontSize = ‘100px‘;
10                 } else {
11                     docEl.style.fontSize = 100 * (clientWidth / 750) + ‘px‘;
12                 }
13             };
14         if (!doc.addEventListener) return;
15         win.addEventListener(resizeEvt, recalc, false);
16         doc.addEventListener(‘DOMContentLoaded‘, recalc, false);
17 })(document, window);