wap手机端解决返回上一页的js实例

<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>