常用JavaScript function整理

 //取得今年民國年  
 function getCurrentYear(){  
    var date = new Date();  
    return date.getFullYear() - 1911;    
 }  
 //取得當下月份  
 function getCurrentMonth(){  
   var date = new Date();  
   return date.getMonth()+1;  
 }  
 //取得當下日期  
 function getCurrentDate(){  
   var date = new Date();  
   return date.getDate();  
 }  
 //取得當月的第一天(民國年+月+日)  
 function getFirstDateOfCurrentMonth(){  
   var date = new Date();  
   var currentYear = date.getFullYear() - 1911;  
   var currentMonth = date.getMonth()+1;  
   return leftPad(String(currentYear), 3) +  
       leftPad(String(currentMonth), 2)+  
       leftPad('1', 2);  
 }  
 //取得當天日期  
 function getCurrentDate(){  
   var date = new Date();  
   var currentYear = date.getFullYear() - 1911;  
   var currentMonth = date.getMonth()+1;  
   var currentDate = date.getDate();  
   return leftPad(String(currentYear), 3) +  
       leftPad(String(currentMonth), 2)+  
       leftPad(currentDate, 2);  
 }  
 //取得當月最後一天  
 function getEndDayInMonth(year, month){  
   return XDate.getDaysInMonth(year, parseInt(month)-1);  
 }  
 //減去指定年，如20141104減去2年，變成20121104  
 function minusYears(date, year){  
   return date.addYears(0 - parseInt(year), true).toString('yyyyMMdd');  
 }  
 //減去指定月，如20141104減去2個月，變成20140904  
 function minusMonths(date, month){  
   return date.addMonths(0 - parseInt(month), true).toString('yyyyMMdd');  
 }  
 //確認是否為數字  
 function isNumber(n) {  
    return !isNaN(parseFloat(n)) && isFinite(n);  
 }  
 //檢查是串是否不為空值且不為undefined  
 function isNotEmptyOrUndefined(str){  
  return str != '' && !angular.isUndefined(str) && str != null;    
 }  
 //檢查是否為空值且為undefined  
 function isEmptyOrUndefined(str){  
  return str == '' || angular.isUndefined(str) || str == null;    
 }  
 //檢查日期起迄，如起始日期為1021101，結束日期為1021103，其會回傳true;  
 //如起始日期為1021103，結束入其為1021101，其會回傳false  
 function isValidStartAndEndDate(startDate, endDate){  
   var isValid = false;  
   var startYear = parseInt(startDate.substring(0, 3))+1911;  
   var startMonth = parseInt(startDate.substring(3, 5)-1);  
   var startDay  = parseInt(startDate.substring(5, 7));  
   var endYear  = parseInt(endDate.substring(0, 3))+1911;  
   var endMonth  = parseInt(endDate.substring(3, 5)-1);  
   var endDay   = parseInt(endDate.substring(5, 7));  
   var sXdate = new XDate(startYear, startMonth, startDay);  
   var eXdate = new XDate(endYear, endMonth, endDay);  
   var diffDays = sXdate.diffDays(eXdate);  
   if(diffDays < 0){  
     isValid = false;  
   }else{  
     isValid = true;  
   }  
   return isValid;  
 }  
 //檢查日期起迄，如起始日期為1020101，結束日期為1020131，其會回傳true;  
 //如起始日期為1031103，結束入其為1021101，其會回傳false  
 function isValidStartAndEndYYYMM(startDate, endDate){  
   var isValid = false;  
   var startYear = parseInt(startDate.substring(0, 3))+1911;  
   var startMonth = parseInt(startDate.substring(3, 5)-1);  
   var startDay  = parseInt(startDate.substring(5, 7));  
   var endYear  = parseInt(endDate.substring(0, 3))+1911;  
   var endMonth  = parseInt(endDate.substring(3, 5)-1);  
   var endDay   = parseInt(endDate.substring(5, 7));  
   var sXdate = new XDate(startYear, startMonth, startDay);  
   var eXdate = new XDate(endYear, endMonth, endDay);  
   var diffDays = sXdate.diffMonths(eXdate);  
   if(diffDays < 0){  
     isValid = false;  
   }else{  
     isValid = true;  
   }  
   return isValid;  
 }  
 //西元轉民國，如20141104轉1021104  
 function convertFromWesternToChinse(western){  
   var year = parseInt(western.substring(0, 4))-1911;  
   var monthDate = western.substring(4, western.length);  
   return leftPad(String(year), 3)+monthDate;  
 }  
 //若未滿位，左邊補0  
 function leftPad(val, length) {  
   var str = '' + val;  
   while (str.length < length) {  
     str = '0' + str;  
   }  
   return str;  
 }  

註: 有用到xdate字眼的部分，要到 http://arshaw.com/xdate/ 這裡下載js檔