/*函数:日期 加n天参数:n是天数返回:n天后的日期*/Date.prototype.addDays = Date.prototype.addDays || function (n) { this.setDate(this.getDate() + n); return this;}/*函数:日期 减n天参数:n是天数返回:n天后的日期*/Date.prototype.minusDays = Date.prototype.minusDays || function (n) { this.setDate(this.getDate() - n); return this;}/*函数:日期 加n天参数:n是天数返回:n天后的日期*/Date.prototype.getWeek = Date.prototype.getWeek || function (date) { var n = date.getDay(); var rtnStr = ""; switch (n) { case 0: { rtnStr = "星期日"; break; } case 1: { rtnStr = "星期一"; break; } case 2: { rtnStr = "星期二"; break; } case 3: { rtnStr = "星期三"; break; } case 4: { rtnStr = "星期四"; break; } case 5: { rtnStr = "星期五"; break; } case 6: { rtnStr = "星期六"; break; } default: { rtnStr = ""; break; } } return rtnStr;}/*函数:把字符串转换为日期对象参数:yyyy-mm-dd或dd/mm/yyyy形式的字符串返回:Date对象注:IE下不支持直接实例化日期对象,如new Date("2011-04-06")*/Date.prototype.convertDate = function (date) { var flag = true; var dateArray = date.split("-"); if (dateArray.length != 3) { dateArray = date.split("/"); if (dateArray.length != 3) { return null; } flag = false; } var newDate = new Date(); if (flag) { // month从0开始 newDate.setFullYear(dateArray[0], dateArray[1] - 1, dateArray[2]); } else { newDate.setFullYear(dateArray[2], dateArray[1] - 1, dateArray[0]); } newDate.setHours(0, 0, 0); return newDate;};/*函数:计算两个日期之间的差值参数:date是日期对象flag:ms-毫秒,s-秒,m-分,h-小时,d-天,M-月,y-年返回:当前日期和date两个日期相差的毫秒/秒/分/小时/天*/Date.prototype.dateDiff = function (date, flag) { var msCount = 1; date = new Date(date); switch (flag) { case "ms": msCount = 1; break; case "s": this.setMilliseconds(0); date.setMilliseconds(0); msCount = 1000; break; case "m": this.setSeconds(0, 0); date.setSeconds(0, 0); msCount = 60 * 1000; break; case "h": this.setMinutes(0, 0, 0); date.setMinutes(0, 0, 0); msCount = 60 * 60 * 1000; break; case "d": this.setHours(0, 0, 0, 0); date.setHours(0, 0, 0, 0); msCount = 24 * 60 * 60 * 1000; break; } var diff = this.getTime() - date.getTime(); return Math.floor(diff / msCount);};/*函数:格式化日期参数:formatStr-格式化字符串d:将日显示为不带前导零的数字,如1dd:将日显示为带前导零的数字,如01ddd:将日显示为缩写形式,如Sundddd:将日显示为全名,如SundayM:将月份显示为不带前导零的数字,如一月显示为1MM:将月份显示为带前导零的数字,如01MMM:将月份显示为缩写形式,如JanMMMM:将月份显示为完整月份名,如Januaryyy:以两位数字格式显示年份yyyy:以四位数字格式显示年份h:使用12小时制将小时显示为不带前导零的数字,注意||的用法hh:使用12小时制将小时显示为带前导零的数字H:使用24小时制将小时显示为不带前导零的数字HH:使用24小时制将小时显示为带前导零的数字m:将分钟显示为不带前导零的数字mm:将分钟显示为带前导零的数字s:将秒显示为不带前导零的数字ss:将秒显示为带前导零的数字l:将毫秒显示为不带前导零的数字ll:将毫秒显示为带前导零的数字tt:显示am/pmTT:显示AM/PM返回:格式化后的日期*/Date.prototype.format = function (formatStr) { var date = this; /* 函数:填充0字符 参数:value-需要填充的字符串, length-总长度 返回:填充后的字符串 */ var zeroize = function (value, length) { if (!length) { length = 2; } value = new String(value); for (var i = 0, zeros = ''; i < (length - value.length); i++) { zeros += '0'; } return zeros + value; }; return formatStr.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|M{1,4}|yy(?:yy)?|([hHmstT])\1?|[lLZ])\b/g, function ($0) { switch ($0) { case 'd': return date.getDate(); case 'dd': return zeroize(date.getDate()); case 'ddd': return ['Sun', 'Mon', 'Tue', 'Wed', 'Thr', 'Fri', 'Sat'][date.getDay()]; case 'dddd': return ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][date.getDay()]; case 'M': return date.getMonth() + 1; case 'MM': return zeroize(date.getMonth() + 1); case 'MMM': return ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][date.getMonth()]; case 'MMMM': return ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'][date.getMonth()]; case 'yy': return new String(date.getFullYear()).substr(2); case 'yyyy': return date.getFullYear(); case 'h': return date.getHours() % 12 || 12; case 'hh': return zeroize(date.getHours() % 12 || 12); case 'H': return date.getHours(); case 'HH': return zeroize(date.getHours()); case 'm': return date.getMinutes(); case 'mm': return zeroize(date.getMinutes()); case 's': return date.getSeconds(); case 'ss': return zeroize(date.getSeconds()); case 'l': return date.getMilliseconds(); case 'll': return zeroize(date.getMilliseconds()); case 'tt': return date.getHours() < 12 ? 'am' : 'pm'; case 'TT': return date.getHours() < 12 ? 'AM' : 'PM'; } });}