text: //监听浏览器大小设置字体
  (function(doc, win) {
      var html = doc.getElementsByTagName("html")[0],
        // orientationchange->手机屏幕转屏事件
        // resize->页面大小改变事件(一边pc端有用)
        reEvt = "orientationchange" in win ? "orientationchange" : "resize",
        reFontSize = function() {
          var clientW = doc.documentElement.clientWidth || doc.body.clientWidth;
          //alert(clientW);
          if(!clientW) {
            return;
          }
          //f/320=80/375
          html.style.fontSize = 100 * (clientW / 375) + "px";
        }
      win.addEventListener(reEvt, reFontSize);
      // DOMContentLoaded->dom加载完就执行,onload要dom/css/js都加载完才执行
      doc.addEventListener("DOMContentLoaded", reFontSize);
    })(document, window);
    