默认时间在当前月

addZero (num) {
  if (num < 10) {
    num = '0' + num
  } else {
    num = num.toString()
  }
  return num
}

let time = new Date()
 let year = time.getFullYear() + ''
 let month = time.getMonth() + 1
 month = this.addZero(month)
 this.formValidate.year = year
 this.formValidate.month = month