关于javascript:根据年月判断总共天数和判断周次

//依据年月判断总共天数
      getDaysInMonth(year, month) {
         month = parseInt(month, 10); 
         var temp = new Date(year, month, 0);
         return temp.getDate();
      },
//依据年月日判断周次
     getWeek(year,month,day){
        month = parseInt(month, 10);         
        day = parseInt(day, 10); 
        let week = new Date(year+"/"+month+"/"+day).getDay();
        return week
     }
     //week:0=>周日     
     //week:1=>周一
     //week:2=>周二
     //week:3=>周三     
     //week:4=>周四
     //week:5=>周五     
     //week:6=>周六