链接地址1：http://www.cnblogs.com/zjzhome/p/4802157.html

链接地址2：http://www.html-js.com/article/Mobile-terminal-H5-mobile-terminal-HD-multi-screen-adaptation-scheme%203041

链接地址3：http://isux.tencent.com/web-app-rem.html

common.js参考淘宝m.taobao.com 

var dpr, rem, scale;var fontEl = document.createElement('style');var metaEl = document.querySelector('meta[name="viewport"]');var docEl = document.documentElement;dpr = window.devicePixelRatio || 1;rem = Math.ceil(docEl.clientWidth * 2 / 10);scale = 1 / dpr;// 设置viewport，进行缩放，达到高清效果metaEl.setAttribute('content', 'width=' + dpr * rem + ',initial-scale=1,maximum-scale=1, minimum-scale=1,user-scalable=no');// 设置data-dpr属性，留作的css hack之用docEl.setAttribute('data-dpr', dpr);// 动态写入样式docEl.firstElementChild.appendChild(fontEl);fontEl.innerHTML = 'html{font-size:' + rem + 'px;}';// 给js调用的，某一dpr下rem和px之间的转换函数window.rem2px = function(v) {    v = parseFloat(v);    return v * rem;};window.px2rem = function(v) {    v = parseFloat(v);    return v / rem;};window.dpr = dpr;window.rem = rem;