<script>      /*網站流量追蹤程式碼 */
      (function (i, s, o, g, r, a, m) {
        i['GoogleAnalyticsObject'] = r; i[r] = i[r] || function () {
          (i[r].q = i[r].q || []).push(arguments)
        }, i[r].l = 1 * new Date(); a = s.createElement(o),
  m = s.getElementsByTagName(o)[0]; a.async = 1; a.src = g; m.parentNode.insertBefore(a, m)
      })(window, document, 'script', '//www.', 'ga');

      ga('create', 'UA-56468019-2', 'auto');
      ga('send', 'pageview');

  </script>

对网站进行分析用，有点类似于百度统计。