考试倒计时jquery+cookie（防止刷新）

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在原贴的基础上改进了一下。基于jquery+cookie实现在线考试倒计时，关闭浏览器后重新打开后依然可以计时。一下代码在本地测试，由于chrome浏览器只支持web的cookie。在实际中倒计时的总时长应从后台获取。

<body><script type="text/javascript">$(function() {      var _minute = parseInt("1");//"1" 倒计时 多长时间，分钟为单位      var _expiresHours = _minute * 60 * 1000;               if(!hasSetCookie()){    //xxxx是cookie的标示,以下均是        addCookie("xxxx", _expiresHours, _expiresHours);      }       settime($("#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] == "xxxx") {          return true;        }      }      return false;    }    //开始倒计时    function settime(remainTime) {      var _time = getCookieValue("871d31bacfd4451484c5f70f8860c2a9");      var _countdown = parseInt(getCookieValue("xxxx")) / 1000;              if (_countdown == -1) {        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("xxxx", _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;        }      }    }        </script><span id="remainTime"></span></body>

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