JS实现处理时间，年月日，星期的公共方法示例

Date.prototype.getWeek = function(){  var firstDayOfYear = new Date(this.getFullYear(),0,1);  var millOfDay = 24*60*60*1000;  return Math.ceil((((this - firstDayOfYear) / millOfDay) + firstDayOfYear.getDay()+1)/7);};/*01 October 2013-10:20:2001 November 2013-10:20:2001 December 2013-10:20:2008 October 2013-01:55 pm*/var monthMapping = {  "January" : "01",  "February" : "02",  "March" : "03",  "April" : "04",  "May" : "05",  "June" : "06",  "July" : "07",  "August" : "08",  "September" : "09",  "October" : "10",  "November" : "11",  "December" : "12"};function formatAmPm() {  var dateTimeStr = arguments[0] ;    var dateStr = dateTimeStr.split("-");  if (lang.currentLang == "zh_CN" || lang.currentLang == "zh_TW"){    var s_year = lang.getMessage('yearCn') ;    var s_month = lang.getMessage('monthCn') ;    var s_day = lang.getMessage('dayCn') ;    var dateArray = dateStr[0].split(" ") ;    var s_time = dateStr[1].split(" ")[1] == "am" ? lang.getMessage('amCn') :lang.getMessage('pmCn') ;    var ret = dateArray[2] + s_year + monthMapping[dateArray[1]] + s_month + dateArray[0] + s_day + " " + s_time + dateStr[1].split(" ")[0] ;     if ( arguments.length > 1 ){      /*admin feature ,so using en date*/      ret = arguments[1] ? dateStr[0] : dateStr[1] ;    }    return ret ;  }    else{    if ( arguments.length > 1 ){      return arguments[1] ? dateStr[0] : dateStr[1] ;          }    else{      return dateStr[0] + " " + dateStr[1] ;    }  }  }function formatDate(dateTime, pattern) {  if(pattern == "" || pattern == null) {    pattern = "/";  }  var date = new Date(dateTime);  var year = date.getFullYear();  var month = date.getMonth()+1;  month = month <10 ? '0'+month : month;  var day = date.getDate();  day = day <10 ? '0'+day : day;  return month + pattern + day + pattern + year;}function formatDateDDMMYYYY(dateTime) {  var ymd = dateTime.split(" ")[0];  var dateArray = ymd.split("-");  return dateArray[2]+"."+dateArray[1]+"."+dateArray[0];}/*** * @param dateTime YYYY-MM-DD hh:mm:ss*/function formatDateDDMMYY(dateTime){  var ymd = dateTime.split(" ")[0];  var dateArray = ymd.split("-");  return dateArray[2]+"."+dateArray[1]+"."+dateArray[0].substring(2);}/**********************calculate date*****************************/var MONTH = [       {key:"Jan.",value:1},       {key:"Feb.",value:2},       {key:"Mar.",value:3},       {key:"Apr.",value:4},       {key:"May.",value:5},       {key:"Jun.",value:6},       {key:"Jul.",value:7},       {key:"Aug.",value:8},       {key:"Sept.",value:9},       {key:"Oct.",value:10},       {key:"Nov.",value:11},       {key:"Dec.",value:12}                 ];var DAYS = [31,28,31,30,31,30,31,31,30,31,30,31];function getYears(){  var years = [];  var date = new Date();  var year = date.getFullYear();  var minYear = year - 10;    for(var currentYear=minYear;currentYear <= year;currentYear++){    years.push(currentYear);  }  return years;};function fillinMonthOptions(id,currentMonth){  $("#" + id).get(0).options.length = 0;  for(var i= 0;i<MONTH.length; i++){    if (MONTH[i].value == currentMonth){      $("#" + id).append("<option value="+MONTH[i].value+" selected=/"selected/">"+MONTH[i].key+"</option>");    }    else{      $("#" + id).append("<option value="+MONTH[i].value+">"+MONTH[i].key+"</option>");    }  }};function fillinAllMonthOptions(monthIds,currentMonth){  //var monthIds = ["loginMonth_1","loginMonth_2","auditMonth_1","auditMonth_2"];  for (var i=0;i<monthIds.length;i++){    fillinMonthOptions(monthIds[i],currentMonth);  };  };function fillinYearOptions(id,years,currentYear){  $("#" + id).get(0).options.length = 0;  for(var i= 0;i<years.length; i++){    if (years[i] == currentYear){      $("#" + id).append("<option value="+years[i]+" selected=/"selected/">"+years[i]+"</option>");    }    else{      $("#" + id).append("<option value="+years[i]+">"+years[i]+"</option>");    }  }};function fillinAllYearOptions(yearIds,currentYear){  //var yearIds = ["loginYear","auditYear"];  years = getYears();  for(var i= 0;i<yearIds.length; i++){    fillinYearOptions(yearIds[i],years,currentYear);  }};function isLeapYear(year){  return (year % 4 === 0) && (year % 100 !==0) || (year % 400 === 0);}/*get days of a month*/function getMonthDays(year,month){  var monthDays = DAYS[month-1];  if (isLeapYear(year) && month == 2){    monthDays = 29;  }  return monthDays;}function fillinDay(id,monthDays){  $("#" + id).get(0).options.length = 0;  for(var i=1;i<=monthDays;i++){    $("#" + id).append("<option value="+i+">"+i+"</option>");  }}function fiilinDays(year,month,dayIds){  var monthDays = getMonthDays(year,month);  for(var i=0;i<dayIds.length;i++){    fillinDay(dayIds[i],monthDays);  }}function getWeeksOfYear(year){  var firstDayOfYear = new Date(year,0,1);  var days = firstDayOfYear.getDay() + (isLeapYear(year) ? 366 : 365);  return Math.ceil(days/7);}function getCurrentWeekNo(){  var currentDate = new Date();  var firstDay = new Date(currentDate.getFullYear(),0,1);  var dayms = 24 * 60 * 60 * 1000;  var numday = ((currentDate - firstDay) / dayms );  var weeks = Math.ceil((numday + firstDay.getDay() + 1) / 7);  return weeks;}function getWeekRangeOfWeek(year,weekNo){  var tmpDate = new Date("1/20/" + year);  var numOfDaysPastSinceLastMonday = tmpDate.getDay()-1;  tmpDate.setDate(tmpDate.getDate() - numOfDaysPastSinceLastMonday);  var weekNoToday = tmpDate.getWeek();  var weeksInFuture = weekNo - weekNoToday;  tmpDate.setDate(tmpDate.getDate() + (7 * weeksInFuture) );  var rangeFrom = tmpDate.getDate() + "/" + MONTH[tmpDate.getMonth()].key;  tmpDate.setDate(tmpDate.getDate() + 6);  var rangeTo = tmpDate.getDate() + "/" + MONTH[tmpDate.getMonth()].key ;  return weekNo + "_#_" + rangeFrom + "_#_" + rangeTo ;}function fillinWeek(weekId,year){  $("#" + weekId).get(0).options.length = 0;  var weeksOfYear = getWeeksOfYear(year);  var weeks = [];  for(var i=0;i<weeksOfYear;i++){    weeks.push(getWeekRangeOfWeek(year,i+1));  }  for(var j=0;j<weeks.length;j++){    var week = weeks[j].split("_#_");    $("#" + weekId).append("<option value="+week[0]+">"+week[0] + "(" + week[1]+"-"+week[2]+")</option>");  }}function fillinWeeks(year,weekIds){  for (var i=0;i<weekIds.length;i++){    fillinWeek(weekIds[i],year);  }}