if(data1.attr === 'last_month') {
 if(month === 1) {
 year = year - 1
 } else {
 month = this.trans_Date(month - 1)
 }
} else if(data1.attr === 'next_month') {
 if(month === 12) {
 year = year + 1
 month = this.trans_Date(1)
 } else {
 month=this.trans_Date(month +1);
 console.log("month", month)
 }
} else {
 month=this.trans_Date(month)
}
 trans_Date(data) {
  if (data < 10) {
   return '0' + data
  } else {
   return data
  }
  }

if(data1.attr === 'last_month') {
   if(month === 1) {
   year = year - 1
   } else {
   month = this.trans_Date(month - 1)
   }
  } else if(data1.attr === 'next_month') {
   if(month === 12) {
   year = year + 1
   month = this.trans_Date(1)
   } else {
   month=this.trans_Date(month-0 +1);
   console.log("month", month)
   }
  } else {
   month=this.trans_Date(month)
  }