DatePicker 日期选择器 限制在指定日期范围内选择

<el-date-picker v-model="value2" type="monthrange" range-separator="-" start-placeholder="开始日期" end-placeholder="结束日期" 
value-format="yyyy-MM" :picker-options="pickerOptions" @change="value2Change">
</el-date-picker>

pickerOptions: {
        disabledDate: time => {
          return new NewDate('2019-8-1 00:00:00').getTime() < time || time < new NewDate('2018-1-1 00:00:00').getTime()
        }
      },