JavaScript实现的Cookie防止刷新在线考试倒计时

$(function() {              var _minute = parseInt("${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;                  };              };          }