对Javascript中Date对象的扩展
对Javascript中Date日期的扩展，主要是对Date对象扩展了一个格式化日期和解析日期的方法。
/**
* 日期解析器
* @param value
* @param format
* @return {Date}
*/
Date.prototype.parser = function(value,format) {
var shortMonthsToNumber = [];
shortMonthsToNumber["Jan"] = "01";
shortMonthsToNumber["Feb"] = "02";
shortMonthsToNumber["Mar"] = "03";
shortMonthsToNumber["Apr"] = "04";
shortMonthsToNumber["May"] = "05";
shortMonthsToNumber["Jun"] = "06";
shortMonthsToNumber["Jul"] = "07";
shortMonthsToNumber["Aug"] = "08";
shortMonthsToNumber["Sep"] = "09";
shortMonthsToNumber["Oct"] = "10";
shortMonthsToNumber["Nov"] = "11";
shortMonthsToNumber["Dec"] = "12";
var parseMonth = function (value) {
return shortMonthsToNumber[value] || value;
};
var padding = function(value, length) {
var paddingCount = length - String(value).length;
for(var i = 0 ; i < paddingCount ; i++) {
value = "0" + value;
}
return value;
};
var parseTime = function (value) {
var retValue = value;
var millis = "";
if (retValue.indexOf(".") !== -1) {
var delimited = retValue.split('.');
retValue = delimited[0];
millis = delimited[1];
}
var values3 = retValue.split(":");
if (values3.length > 0) {
var hour = 0,minute = 0,second = 0,millis = 0;
var hour = values3[0];
if(values3[1]){
minute = values3[1];
}
if(values3[2]){
second = values3[2];
}
return {
time: retValue,
hour: hour,
minute: minute,
second: second,
millis: millis
};
} else {
return {
time: "",
hour: "",
minute: "",
second: "",
millis: ""
};
}
};
var resultDate = new Date(1970, 01, 01, 00, 00, 00);
if(!value){
return resultDate;
}
try {
var date = null;
var year = null;
var month = null;
var dayOfMonth = null;
var time = null;
if (typeof value == "number"){
return this.date(new Date(value), format);
} else if (typeof value.getFullYear == "function") {
year = value.getFullYear();
month = value.getMonth() + 1;
dayOfMonth = value.getDate();
time = parseTime(value.toTimeString());
} else if (value.search(/\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.?\d{0,3}[Z\-+]?(\d{2}:?\d{2})?/) != -1) {
/* 2009-04-19T16:11:05+02:00 || 2009-04-19T16:11:05Z */
var values = value.split(/[T\+-]/);
year = values[0];
month = values[1];
dayOfMonth = values[2];
time = parseTime(values[3].split(".")[0]);
date = new Date(year, month - 1, dayOfMonth);
} else {
var values = value.split(" ");
switch (values.length) {
case 6:
/* Wed Jan 13 10:43:41 CET 2010 */
year = values[5];
month = parseMonth(values[1]);
dayOfMonth = values[2];
time = parseTime(values[3]);
date = new Date(year, month - 1, dayOfMonth);
break;
case 2:
/* 2009-12-18 10:54:50.546 */
var values2 = values[0].split("-");
year = values2[0];
month = values2[1];
dayOfMonth = values2[2];
time = parseTime(values[1]);
date = new Date(year, month - 1, dayOfMonth);
break;
case 7:
/* Tue Mar 01 2011 12:01:42 GMT-0800 (PST) */
case 9:
/* Fri Apr 08 2011 00:00:00 GMT+0800 (China Standard Time) */
case 10:
/* Fri Apr 08 2011 00:00:00 GMT+0200 (W. Europe Daylight Time) */
year = values[3];
month = parseMonth(values[1]);
dayOfMonth = values[2];
time = parseTime(values[4]);
date = new Date(year, month - 1, dayOfMonth);
break;
case 1:
/* 2012-02-07CET00:00:00 */
var values2 = values[0].split("");
if(values2.length > 3){
year=values2[0]+values2[1]+values2[2]+values2[3];
}
if(values2.length > 6){
month= values2[5]+values2[6];
}
if(values2.length > 9){
dayOfMonth = values2[8]+values2[9];
}
if(values2.length > 20){
time = parseTime(values2[13]+values2[14]+values2[15]+values2[16]+values2[17]+values2[18]+values2[19]+values2[20]);
}
if(Number(dayOfMonth) && Number(month) && Number(dayOfMonth)){
date = new Date(year, month - 1, dayOfMonth);
}else {
return new Date();
}
break;
default:
return new Date();
}
}
var pattern = "";
if(!format){
format = "yyyy-MM-dd HH:mm:ss";
}
for (var i = 0; i < format.length; i++) {
var currentPattern = format.charAt(i);
pattern += currentPattern;
switch (pattern) {
case "D":
case "ddd":
pattern = "";
break;
case "dd"://月中的某一天。一位数的日期有一个前导零。
if (format.charAt(i + 1) == "d") {
break;
}
resultDate.setDate(Number(padding(dayOfMonth, 2)));
pattern = "";
break;
case "d"://月中的某一天。一位数的日期没有前导零。
if (format.charAt(i + 1) == "d") {
break;
}
resultDate.setDate(parseInt(dayOfMonth, 10));
pattern = "";
break;
case "MMMM"://月份的完整名称，在 MonthNames 中定义。
case "MMM"://月份的缩写名称，在 AbbreviatedMonthNames 中定义。
pattern = "";
break;
case "MM"://月份数字。一位数的月份有一个前导零。
if (format.charAt(i + 1) == "M") {
break;
}
resultDate.setMonth(Number(padding(month, 2))-1, 1);
pattern = "";
break;
case "M"://月份数字。一位数的月份没有前导零。
if (format.charAt(i + 1) == "M") {
break;
}
resultDate.setMonth(parseInt(month, 10)-1, 1);
pattern = "";
break;
case "y"://不包含纪元的年份。不具有前导零。
case "yyy":
if (format.charAt(i + 1) == "y") {
break;
}
pattern = "";
break;
case "yy"://不包含纪元的年份。具有前导零。
if (format.charAt(i + 1) == "y" &&
format.charAt(i + 2) == "y") {
break;
}
resultDate.setFullYear(Number('19'+String(year).slice(-2)), 1, 1);
pattern = "";
break;
case "yyyy"://包括纪元的四位数的年份。
resultDate.setFullYear(Number(year), 1, 1);
pattern = "";
break;
case "HH"://24 小时制的小时。一位数的小时数有前导零。
resultDate.setHours(Number(padding(time.hour, 2)));
pattern = "";
break;
case "H"://24 小时制的小时。一位数的小时数没有前导零。
if (format.charAt(i + 1) == "H") {
break;
}
resultDate.setHours(parseInt(time.hour, 10));
pattern = "";
break;
case "hh"://12 小时制的小时。一位数的小时数有前导零。
var hour = (time.hour == 0 ? 12 : time.hour < 13 ? time.hour : time.hour - 12);
resultDate.setHours(Number(padding(hour, 2)));
pattern = "";
break;
case "h"://12 小时制的小时。一位数的小时数没有前导零。
if (format.charAt(i + 1) == "h") {
break;
}
var hour = (time.hour == 0 ? 12 : time.hour < 13 ? time.hour : time.hour - 12);
resultDate.setHours(parseInt(hour, 10));
pattern = "";
break;
case "mm"://将分钟显示为带前导零的数字
resultDate.setMinutes(Number(padding(time.minute,2)));
pattern = "";
break;
case "m"://将分钟显示为不带前导零的数字
if (format.charAt(i + 1) == "m") {
break;
}
resultDate.setMinutes(Number(time.minute));
pattern = "";
break;
case "ss"://将秒显示为带前导零的数字
resultDate.setSeconds(Number(padding(time.second.substring(0, 2), 2)));
pattern = "";
break;
case "s"://将秒显示为不带前导零的数字
if (format.charAt(i + 1) == "s") {
break;
}
resultDate.setSeconds(Number(time.second));
pattern = "";
break;
default:
pattern = "";
break;
}
}
return resultDate;
} catch(e) {
if(window.console){
console.error(e);
}
return resultDate;
}
}
