移动端页面自适应解决方案—rem布局

(function (doc, win) {

        var docEl = doc.documentElement,

            resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',

            recalc = function () {

                var clientWidth = docEl.clientWidth;

                if (!clientWidth) return;

                if(clientWidth>=640){

                    docEl.style.fontSize = '100px';

                }else{

                    docEl.style.fontSize = 100 * (clientWidth / 640) + 'px';

                }

            };

        if (!doc.addEventListener) return;

        win.addEventListener(resizeEvt, recalc, false);

        doc.addEventListener('DOMContentLoaded', recalc, false);

    })(document, window);