获取上周时间段

// 获取上周时间段
    getLastWeek(value){
        value = new Date(value)
        let myDate = new Date(value.getTime() - 7 * 24 * 3600 * 1000)
        let day = myDate.getDay()    // 回退7天后是星期几？
        let time = myDate.getDate() - day + (day === 0 ? -6 : 1)    
        let startTime = new Date(myDate.setDate(time))
        let startDateTime =
          startTime.getFullYear() +
          '-' +
          (startTime.getMonth() + 1) +
          '-' +
          startTime.getDate()
        let endTime = new Date(myDate.setDate(time + 6))
        let endDateTime =
          endTime.getFullYear() +
          '-' +
          (endTime.getMonth() + 1) +
          '-' +
          endTime.getDate()
        return {
            startDateTime:startDateTime,
            endDateTime:endDateTime
        }
    }