背景：
JS 有自己的 时间类型 Date —— 但是，在某些情况下 这个对象似乎 不太好用。
本文 基于 JQuery 扩展了一些 JS日期函数，包括：
> 字符串 转 Date 对象 万能函数（性能仅 10W次/s，函数有路径优化，字符串越诡异 耗时越长）
> Date 转 字符串 格式化
> 两个 Date 的差值 （返回的结果类似 C# TimeSpan 对象）
一言不合，直接上代码：
1 /*感谢 InkFx (C) http://www.ink-fx.com 为 以下日期函数 作出的努力 */ 2 jQuery = window.jQuery || { }; 3 4 (function($) { 5 6 7 /*--数据类型转换函数 Start----------------------------------*/ 8 9 $.isArray = function(obj) {var result = false;try {result = Object.prototype.toString.apply(obj) === '[object Array]';if (result) return true;} catch(e) {}try {result = obj.constructor === Array;if (result) return true;} catch(e) {}return false;}; 10 $.toInt = function(obj, dft) {try {dft = (typeof dft === 'number') ? dft : 0;} catch(e) {dft = 0;}try {if (obj == null) return dft;if (typeof obj === 'number') return parseInt(obj);var match = obj.toString().toLowerCase().match(/-*[0123456789abcdefx.]+/);var str = match == null || match.length <= 0 ? null : match[0];var result = null;if (str != null && str.length >= 2 && str.substr(0, 2) == "0x") {str = str.substr(2);result = parseInt(str, 16);} else {result = parseInt(str);}if (result == null || !isFinite(result)) return dft;return result;} catch(e) {return dft;}}; 11 $.toFloat = function(obj, dft) {try {dft = (typeof dft === 'number') ? dft : 0;} catch(e) {dft = 0;}try {if (obj == null) return dft;if (typeof obj === 'number') return parseFloat(obj);var match = obj.toString().toLowerCase().match(/-*[0123456789abcdefx.]+/);var str = match == null || match.length <= 0 ? null : match[0];var result = null;if (str != null && str.length >= 2 && str.substr(0, 2) == "0x") {str = str.substr(2);result = parseFloat(parseInt(str, 16));} else {result = parseFloat(str);}if (result == null || !isFinite(result)) return dft;return result;} catch(e) {return dft;}}; 12 $.toString = function(obj, dft) {try {dft = (typeof dft === 'string') ? dft : '';} catch(e) {dft = '';}try {if (obj == null) return dft;if (typeof obj === 'string') return obj;return obj.toString();} catch(e) {return dft;}}; 13 $.toDateTime = function(obj, dft) {try {dft = (dft instanceof Date) ? dft : new Date(1900, 00, 01);} catch(e) {dft = new Date(1900, 00, 01);}try {if (obj == null) return dft;if (obj instanceof Date) return obj;var result = parseDate(obj);if (result == null) return dft;return result;} catch(e) {return dft;}}; 14 $.toBoolean = function(obj, dft) {try {dft = (typeof dft === 'boolean') ? dft : false;} catch(e) {dft = false;}try {if (obj == null) return dft;if (obj == true) return true;if (obj == false) return false;if ($.isArray(obj)) return obj.length >= 1;if (typeof obj === 'boolean') return obj.toString().toLowerCase() == "true";if (typeof obj === 'number') return parseFloat(obj) > 0;/*if (typeof obj === 'string') return parseFloat(obj) > 0;*/if (obj.toString().toLowerCase() == "t") return true;if (obj.toString().toLowerCase() == "true") return true;return false;} catch(e) {return dft;}}; 15 16 17 /*--数据类型转换函数 End------------------------------------*/ 18 19 20 21 /*--时间相关函数 Start--------------------------------------*/ 22 23 $.formatDate = function(date, fmt) {try {date = $.toDateTime(date);fmt = fmt || "yyyy-MM-dd HH:mm:ss"; o = {"M+": date.getMonth() + 1,"d+": date.getDate(),"H+": date.getHours(),"h+": date.getHours() /*(date.getHours() > 12 ? (date.getHours() - 12) : date.getHours())*/,"m+": date.getMinutes(),"s+": date.getSeconds(),"q+": Math.floor((date.getMonth() + 3) / 3),"S": date.getMilliseconds(),"f+": date.getMilliseconds()};if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));for (var k in o)if (new RegExp("(" + k + ")").test(fmt)) {var padLeft = (k == "S" || k == "f+") ? "000" : "00";fmt = fmt.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : (padLeft + o[k]).substr(("" + o[k]).length));}return fmt;} catch(e) { return ""; }}; 24 $.isLeapYearDate = function(date) {try {date = $.toDateTime(date);return (0 == date.getFullYear() % 4 && ((date.getFullYear() % 100 != 0) || (date.getFullYear() % 400 == 0)));} catch(e) {return false;}}; 25 26 $.addYears = function(date, num) {try {date = $.toDateTime(date);num = $.toInt(num);var year = date.getFullYear();var month = date.getMonth();var day = date.getDate();var hour = date.getHours();var minute = date.getMinutes();var second = date.getSeconds();var millisecond = date.getMilliseconds();var result = new Date(year + num, month, day, hour, minute, second, millisecond);return result;} catch(e) { return new Date(1900, 01, 01); }}; 27 $.addMonths = function(date, num) {try {date = $.toDateTime(date);num = $.toInt(num);var year = date.getFullYear();var month = date.getMonth();var day = date.getDate();var hour = date.getHours();var minute = date.getMinutes();var second = date.getSeconds();var millisecond = date.getMilliseconds();var addYear = (num + month) / 12;month = (num + month) % 12;var result = new Date(year + addYear, month, day, hour, minute, second, millisecond);return result;} catch(e) { return new Date(1900, 01, 01); }}; 28 $.addDays = function(date, num) {try {date = $.toDateTime(date);num = $.toInt(num);var result = new Date(date.valueOf() + (num * 1000 * 60 * 60 * 24));return result;} catch(e) { return new Date(1900, 01, 01); }}; 29 $.addHours = function(date, num) {try {date = $.toDateTime(date);num = $.toInt(num);var result = new Date(date.valueOf() + (num * 1000 * 60 * 60));return result;} catch(e) { return new Date(1900, 01, 01); }}; 30 $.addMinutes = function(date, num) {try {date = $.toDateTime(date);num = $.toInt(num);var result = new Date(date.valueOf() + (num * 1000 * 60));return result;} catch(e) { return new Date(1900, 01, 01); }}; 31 $.addSeconds = function(date, num) {try {date = $.toDateTime(date);num = $.toInt(num);var result = new Date(date.valueOf() + (num * 1000));return result;} catch(e) { return new Date(1900, 01, 01); }}; 32 $.addMilliseconds = function(date, num) {try {date = $.toDateTime(date);num = $.toInt(num);var result = new Date(date.valueOf() + num);return result;} catch(e) { return new Date(1900, 01, 01); }}; 33 $.getTimeSpan = function(date1, date2) {var timestamp = 0;if((date1 instanceof Date || date2 instanceof Date || date2 == null) || (date1 != null && date2 != null)) {date1 = $.toDateTime(date1);date2 = $.toDateTime(date2);timestamp = $.toFloat(date1 - date2);} else {timestamp = $.toInt(date1);}var temp = $.toInt(timestamp / 1000);var totalMilliSecond = timestamp;var totalSecond = timestamp / (1000);var totalMinute = timestamp / (1000 * 60);var totalHour = timestamp / (1000 * 60 * 60);var totalDay = timestamp / (1000 * 60 * 60 * 24);var milliSecond = $.toInt(totalMilliSecond) % 1000;var second = $.toInt(totalSecond) % 60;var minute = $.toInt(totalMinute) % 60;var hour = $.toInt(totalHour) % 24;var day = $.toInt(totalDay);return {TimeStamp: timestamp,Days: day,Hours: hour,Minutes: minute,Seconds: second,Milliseconds: milliSecond,TotalDays: totalDay,TotalHours: totalHour,TotalMinutes: totalMinute,TotalSeconds: totalSecond,TotalMilliseconds: totalMilliSecond,valueOf: function() { return this.TimeStamp; },toString: function() { return this.Days + "." + $.padLeft(this.Hours, 2, "0") + ":" + $.padLeft(this.Minutes, 2, "0") + ":" + $.padLeft(this.Seconds, 2, "0") + "." + $.padLeft(this.Milliseconds, 3, "0"); } };} 34 35 /*--时间相关函数 End----------------------------------------*/ 36 37 38 })(jQuery);