vue時間轉換-將時間轉換為本月第幾周-方法記錄

1、引入moment時間轉換

　　const moment = require('moment')

2、獲取當前時間

var key='周報'
var dateTime='2021-06-01 15:14:15'
this.checkDate (key, dateTime)

3。轉換

checkDate (key, dateTime) {
      if (key && dateTime) {
        if (key == '日報') {
          return moment(dateTime).format('YYYY年MM月DD日')
        }
        if (key == '月報') {
          return moment(dateTime).format('YYYY年MM月')
        }
        if (key == '周報') {
          var yearNum = moment(dateTime).format('YYYY')
          var monthNum = moment(dateTime).format('MM')
          var dayNum = moment(dateTime).format('DD')
          var getDate = this.getMonthWeek(yearNum, monthNum, dayNum)
          var dateStr = getDate.getYear + '年' + getDate.getMonth + '月第' + getDate.getWeek + '周'
          return dateStr
        }
      } else {
        return '-'
      }
    },
    getMonthWeek (yearNum, monthNum, dayNum) {
      var date = new Date(yearNum, parseInt(monthNum) - 1, dayNum)
      var w = date.getDay()
      var d = date.getDate()
      if (w == 0) {
        w = 7
      }
      var config = {
        getMonth: date.getMonth() + 1,
        getYear: date.getFullYear(),
        getWeek: Math.ceil((d + 6 - w) / 7)
      }
      return config
    }