手机端rem

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

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