创建一个获取日期组的方法，根据传入的不同日期类型，返回不同的日期数组
type的枚举值："YEAR"、"MONTH"、"DAY"

getDateList(type){
      let dateList=[]
      let year=new Date().getFullYear()
      let month=new Date().getMonth()+1 //当前月份
      let day=new Date().getDate()
      console.log(year,month,day)
      if(type==="YEAR"){
        for (let i = 0; i < 5; i++) {
          dateList.push(year-i)
        }
      }else if(type==="MONTH"){
        for (let i = 0; i < 6; i++) {
          if (month <= 0) {year = year - 1;month = month + 12;}
          if (month < 10) {month = "0" + month;}
          dateList[i] = year + "-" + month
          month = month - 1
        }
      }else{
        for (let i = 0; i < 7; i++) {
          if (day-7<= 0) {
            //1周前所在月的总天数
            let endTimeMonthDay = new Date(year, parseInt(month) - 1, 0).getDate()
            if (month - 1 <= 0) {
                //如果在当年的1月份
                if(day-i>0){
                  dateList.push(year + "-" + month + "-" + `0${day - i}`)
                }else{
                  dateList.push(year-1 + "-" + 12 + "-" + (endTimeMonthDay - (i-day)))
                }
              } else {
                if(day-i>0){
                  dateList.push(year + "-" + month + "-" + `0${day - i}`)
                }else{
                  dateList.push(year + "-" + (month - 1) + "-" + (endTimeMonthDay - (i-day)))
                }
              }
          }else{
            if(day-i<10){
              dateList.push(year + "-" + month + "-" + `0${day - i}`)
            }else{
              dateList.push(year + "-" + month + "-" + (day - i))
            }
          }
        }
      }
      dateList=dateList.reverse()
      return dateList
    }

示例：
当前日期：

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若month=3，获取近6个月如下（跨年取月份）：

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