<input id="hd_referrer" type="hidden" />
        <a href="javascript:void(0)" onclick="referurl(); ">返回 </a>
        <script>
          $(function () {
            $("#hd_referrer").val(document.referrer);
          });

          function referurl() {
            var ref = $("#hd_referrer").val();
            if (ref != "" && ref != "undefined") {
              location.href = ref;
            }
            else {
              location.href = history.back(-1); 
            }
          }
        </script>