/* 　　doc:不用管：document对象 　　win:不用管：window对象 　　design:注意：设计稿的尺寸/物理像素 */

(function (doc, win,design) {
  // alert(123)       var docEl = doc.documentElement,          resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',          recalc = function () {
               var clientWidth = docEl.clientWidth;              if (!clientWidth) return;              if(clientWidth>design){
                   docEl.style.fontSize = 100 * (clientWidth / design) + 'px';              }              else if(clientWidth==design){
                   docEl.style.fontSize = '100px';              }else{
                   docEl.style.fontSize = 100 * (clientWidth / design) + 'px';              }          };     if (!doc.addEventListener) return;      win.addEventListener(resizeEvt, recalc, false);      doc.addEventListener('DOMContentLoaded', recalc, false); })(document, window,375); /* window.onload = function() {
      document.documentElement.style.fontSize = document.documentElement.clientWidth / 320 * 20 + 'px';     window.onresize = function() {
          document.documentElement.style.fontSize = document.documentElement.clientWidth / 320 * 20 + 'px';     }; }; */