index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>liao</title>
  </head>
  <body>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
  <script type="text/javascript">
	  (function (doc, win) {   
          var docEl = doc.documentElement,   
          resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',   
          recalc = function () {   
          var clientWidth = docEl.clientWidth;   
          if (!clientWidth) return;   
          docEl.style.fontSize = 50 * (clientWidth / 375) + 'px';   
      };   
      if (!doc.addEventListener) return;   
      win.addEventListener(resizeEvt, recalc, false);   
      doc.addEventListener('DOMContentLoaded', recalc, false);   
      })(document, window);   
  </script>
</html>