如何利用微信内嵌H5网页解决JS倒计时失效的问题

<script type="text/javascript"><br> var timespan = '20160113'; //后台程序生成24小时时间差值，这里随便写写

  var timer;

  function UpdateTime() {

   if (timespan > 0) {

    var hour = Math.floor(timespan / (60 * 60));

    var minute = Math.floor((timespan - (hour * 60 * 60)) / 60);

    var second = (timespan - (hour * 60 * 60) - (minute * 60));

    var word = "支付剩余时间" + (hour<10?("0"+hour):hour) + "：" + (minute<10?("0"+minute):minute) + "：" + (second<10?("0"+second):second) + "，逾期订单将自动取消~";

    timespan--;

    jQuery(".tc").html("<i class='time'></i>" + word);

    timer = setTimeout("UpdateTime()", 1000);

   }

   else {

    $('.content').find('.w_op').hide();

    clearTimeout(timer);

    jQuery(".tc").html("<i class='time'></i>" + "订单过期，已自动取消~");

    window.location.href='@Url.Action("orderDetail", "Order", new { OrderNumber = Model.No })';; //订单过期，跳转到订单详情页

   }

  }

  jQuery(document).ready(function () {

   UpdateTime();

  });<br></script>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">