日历封装

getManthDate (year, month) {
        this.year = parseInt(year)
        this.month = parseInt(month)
        if (month === 13) {
          month = 1
          this.month = 1
          year += 1
          this.year += 1
        }
        if (month === 0) {
          month = 12
          this.month = 12
          year -= 1
          this.year -= 1
        }
        var tempArray = []
        var ret = []
        if (!year || !month) {
          var today = new Date()
          year = today.getFullYear()
          month = today.getMonth() + 1
          this.year = year
          this.month = month
        }
        var firstDay = new Date(year, month - 1, 1)
        var firstWeekDay = firstDay.getDay()
        firstWeekDay = firstWeekDay === 0 ? 7 : firstWeekDay
        var lastDayofLastMonth = new Date(year, month - 1, 0)
        var lastDateOfLastMonth = lastDayofLastMonth.getDate()
        var preMonthDayCount = firstWeekDay - 1
        var lastDay = new Date(year, month, 0)
        console.log('lastDay', lastDay)
        var lastDate = lastDay.getDate()
        for (let i = 0; i < 6 * 7; i++) {
          var date = i + 1 - preMonthDayCount
          var isActiveMonth = 1
          var showDate = date
          var thisMonth = month
          if (date <= 0) {
            isActiveMonth = 0
            thisMonth = month - 1
            showDate = lastDateOfLastMonth + date
          } else if (date > lastDate) {
            isActiveMonth = 2
            thisMonth = month + 1
            showDate = showDate - lastDate
          }
          thisMonth = thisMonth === 0 ? 12 : thisMonth
          thisMonth = thisMonth === 13 ? 1 : thisMonth
          tempArray.push({
            isAct: isActiveMonth,
            month: thisMonth,
            date: date,
            showDate: showDate
          })
        }
        for (let j = 0; j < tempArray.length; j += 7) {
          ret.push(tempArray.slice(j, j + 7))
        }
        this.days = ret
        if (!this.dateString) {
          this.selectedDate = new Date().getDate()
        } else {
          this.selectedDate = parseInt(this.dateString.split('-')[2])
        }
        console.log(this.days, 'days')
        console.log('selectedDate', this.selectedDate)
        console.log('year', this.year)
        console.log('month', this.month)
      }