1 /** 2 * @author 陈维斌 3 * 如果想将日期字符串格式化,需先将其转换为日期类型Date 4 * 以下是提供几种常用的 5 * 6 * var da = new Date().format('yyyy-MM-dd hh:mm:ss'); //将日期格式串,转换成先要的格式 7 * alert("格式化日期类型 \n" + new Date() + "\n 为字符串:" + da); 8 * 9 * var str = "2014/01/01 01:01:01" // yyyy/mm/dd这种格式转化成日期对像可以用new Date(str);在转换成指定格式10 * alert("格式化字符串\n" + str + " 为日期格式 \n" + new Date(str).format('yyyy-MM-dd hh:mm:ss'))11 *12 *13 * var str1 = "2014-12-31 00:55:55" // yyyy-mm-dd这种格式的字符串转化成日期对象可以用new Date(Date.parse(str.replace(/-/g,"/")));14 * alert("格式化字符串\n" + str1 + " 为日期格式 \n" + new Date(Date.parse(str1.replace(/-/g, "/"))).format('yyyy-MM-dd hh:mm:ss'))15 *16 *17 * 日期加月18 * 先将字符转换成Date类型才可以使用19 * var str1 = "2014-12-31 00:55:55" // yyyy-mm-dd这种格式的字符串转化成日期对象可以用new Date(Date.parse(str.replace(/-/g,"/")));20 * 例如 var saveDate = new Date(Date.parse(str1.replace(/-/g, "/"))).addMonth(5)21 * addMonth(月数) 必须为整数22 */23 24 Date.prototype.format = function (format) {25 var date = {26 "M+": this.getMonth() + 1,27 "d+": this.getDate(),28 "h+": this.getHours(),29 "m+": this.getMinutes(),30 "s+": this.getSeconds(),31 "q+": Math.floor((this.getMonth() + 3) / 3),32 "S+": this.getMilliseconds()33 };34 if (/(y+)/i.test(format)) {35 format = format.replace(RegExp.$1, (this.getFullYear() + '').substr(4 - RegExp.$1.length));36 }37 for (var k in date) {38 if (new RegExp("(" + k + ")").test(format)) {39 format = format.replace(RegExp.$1, RegExp.$1.length == 140 ? date[k] : ("00" + date[k]).substr(("" + date[k]).length));41 }42 }43 return format;44 }45 Date.daysInMonth = function (year, month) {46 if (month == 1) {47 if (year % 4 == 0 && year % 100 != 0)48 return 29;49 else50 return 28;51 } else if ((month <= 6 && month % 2 == 0) || (month = 6 && month % 2 == 1))52 return 31;53 else54 return 30;55 };56 Date.prototype.addMonth = function (addMonth) {57 var y = this.getFullYear();58 var m = this.getMonth();59 var nextY = y;60 var nextM = m;61 //如果当前月+要加上的月>11 这里之所以用11是因为 js的月份从0开始62 if (m > 11) {63 nextY = y + 1;64 nextM = parseInt(m + addMonth) - 11;65 } else {66 nextM = this.getMonth() + addMonth67 }68 var daysInNextMonth = Date.daysInMonth(nextY, nextM);69 var day = this.getDate();70 if (day > daysInNextMonth) {71 day = daysInNextMonth;72 }73 return new Date(nextY, nextM, day);74 };

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