年月日によって全部の日数と判断する週次

//          
      getDaysInMonth(year, month) {
         month = parseInt(month, 10); 
         var temp = new Date(year, month, 0);
         return temp.getDate();
      },
//         
     getWeek(year,month,day){
        month = parseInt(month, 10);         
        day = parseInt(day, 10); 
        let week = new Date(year+"/"+month+"/"+day).getDay();
        return week
     }
     //week:0=>       
     //week:1=>  
     //week:2=>  
     //week:3=>       
     //week:4=>  
     //week:5=>       
     //week:6=>