vue 中使用 rem

<script>
    (function (doc, win, imgW) {
      var docEl = doc.documentElement,
        resizeEvt = ‘orientationchange‘ in window ? ‘orientationchange‘ : ‘resize‘,
        recalc = function () {
          var clientWidth = docEl.clientWidth;
          console.log(clientWidth);
          if (!clientWidth) return;
          if (clientWidth >= imgW) {
            docEl.style.fontSize = ‘100px‘;
          } else {
            docEl.style.fontSize = 100 * (clientWidth / imgW) + ‘px‘;
          }
        };

      if (!doc.addEventListener) return;
      win.addEventListener(resizeEvt, recalc, false);
      doc.addEventListener(‘DOMContentLoaded‘, recalc, false);
    })(document, window, 750);


  </script>