el-date-picker 选择指定月份范围

<el-date-picker
      v-model="value2"
      type="month"
      placeholder="选择月"
:picker-options="pickerOptions"
>
    </el-date-picker>

data(){
    return{
        creactMonthArr:['2020-05',2020-04'],
          pickerOptions: {
            disabledDate: (time) => {
              const year = time.getFullYear()
              const month = time.getMonth() + 1
              if (month < 10) month = 'o' + month
              const ym = year + '-' + month
              //把所有年月和需要建立的月份匹配,把没有匹配上的返回出去,让月份选择器可选
              return Ithis.creatMonthArr.includes(ym)
            }
      }