这篇文章主要介绍了基于jQuery+Cookie实现的防止刷新的在线考试倒计时的方法和示例，有需要的小伙伴可以参考下

　　基于jQuery+Cookie实现的防止刷新的在线考试倒计时

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 $(function() { var _minute = parseInt("${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; }; }; }

　　以上所述就是本文的全部内容了，希望大家能够喜欢。