手机端转换rem适应

  <script>
    (function() {
      var changeRem = function() {
        document.getElementsByTagName('html')[0].style.fontSize = document.documentElement.clientWidth / 20 + 'px';
      };
      changeRem();
      var t;
      window.addEventListener('resize', function() {
        clearTimeout(t);
        t = setTimeout(changeRem, 300);
      }, false);
      window.addEventListener('pageshow', function(e) {
        if (e.persisted) {
          clearTimeout(t);
          t = setTimeout(changeRem, 300);
        }
      }, false);
    }());
  </script>

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