rem.js(第二版)

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            if (clientWidth >= 750) {
8                // docEl.style.fontSize = '100px';
9                docEl.setAttribute('style', 'font-size:100px!important');
10            } else {
11                docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';
12            }
13        };
14
15    if (!doc.addEventListener) return;
16    win.addEventListener(resizeEvt, recalc, false);
17    doc.addEventListener('DOMContentLoaded', recalc, false);
18})(document, window);