移动端字体自适应

(function flexible(window, document) {
   function setBodyFontSize () {
      if (document.body) {
        var deviceWidth = document.documentElement.clientWidth;
        document.documentElement.style.fontSize = deviceWidth / 25.6 + 'px';
      } else {
        document.addEventListener('DOMContentLoaded', setBodyFontSize);
      }
    }
    setBodyFontSize();

    window.addEventListener('resize', setBodyFontSize);
  })(window, document);
 </script>