基于jQuery+Cookie实现的防止刷新的在线考试倒计时

$(function() {      var _minute = parseInt("${exampaper.paperTime }");      var _expiresHours = _minute * 60 * 1000;              if(!hasSetCookie()){        addCookie("${examinee.examineeId}", _expiresHours, _expiresHours);      }       settime($("#remainTime"));     });    function hasSetCookie(){      var strCookie = document.cookie;      var arrCookie = strCookie.split("; ");      for (var i = 0; i < arrCookie.length; i++) {        var arr = arrCookie[i].split("=");        if (arr[0] == "${examinee.examineeId}") {          return true;        }      };      return false;    }    //开始倒计时    function settime(remainTime) {      var _time = getCookieValue("871d31bacfd4451484c5f70f8860c2a9");      var _countdown = parseInt(getCookieValue("${examinee.examineeId}")) / 1000;             if (_countdown <= 0) {        alert("考试时间到！");        endExam();      } else {        var _second = _countdown % 60;        var _minute = parseInt(_countdown / 60) % 60;        var _hour = parseInt(parseInt(_countdown / 60) / 60);         if (_hour < 10)          _hour = "0" + _hour.toString();        if (_second < 10)          _second = "0" + _second.toString();        if (_minute < 10)          _minute = "0" + _minute.toString();         remainTime.html(_hour + ":" + _minute + ":" + _second);        _countdown--;        editCookie("${examinee.examineeId}", _countdown * 1000, _countdown * 1000);      }      //每1000毫秒执行一次      setTimeout(function() {        settime(remainTime);      }, 1000);    };     //时添加cookie    function addCookie(name, value, expiresHours) {      var cookieString = name + "=" + escape(value); //escape() 函数可对字符串进行编码，这样就可以在所有的计算机上读取该字符串。      //判断是否设置过期时间,0代表关闭浏览器时失效      if (expiresHours > 0) {        var date = new Date();        date.setTime(date.getTime() + expiresHours * 1000);        cookieString = cookieString + ";expires=" + date.toUTCString();      }      document.cookie = cookieString;    }     //修改cookie的值    function editCookie(name, value, expiresHours) {      var cookieString = name + "=" + escape(value);      if (expiresHours > 0) {        var date = new Date();        date.setTime(date.getTime() + expiresHours * 1000); //单位是毫秒        cookieString = cookieString + ";expires=" + date.toGMTString();      }      document.cookie = cookieString;    }     //根据名字获取cookie的值    function getCookieValue(name) {      var strCookie = document.cookie;      var arrCookie = strCookie.split("; ");      for (var i = 0; i < arrCookie.length; i++) {        var arr = arrCookie[i].split("=");        if (arr[0] == name) {          return unescape(arr[1]);          break;        } else {          continue;        };      };    }