代码简写如下，发现不能出发change事件，不知道为何

<KPickerView @change="changeIndex" :value="multiArray">
    <KPickerViewColumn>
        <KView v-for="(item,index) in listCity" :key="index" >
            {{item}}
        </KView>
    </KPickerViewColumn>
    <KPickerViewColumn>
        <KView v-for="(item,index) in listTime" :key="index" >
            {{item}}
        </KView>
    </KPickerViewColumn>
</KPickerView>


  data() {
    return {
      multiArray: [0, 0],
      listCity: ['北京', '上海', '广州'],
      listTime: ['1月', '2月', '3月'],
    }
  },