Vue's city selection 3-level linkage implementation method based on mint-ui

<p>
  <mt-picker :slots="myAddressSlots" @change="onMyAddressChange"></mt-picker>
  <p>地址3级联动：{{myAddressProvince}} {{myAddressCity}} {{myAddresscounty}}</p>
</p>

<script>
  import { Picker } from &#39;mint-ui&#39;;
  import myaddress from &#39;../../../static/address3.json&#39;     //引入省市区数据
  export default {
    name: &#39;&#39;,
    components: {
      &#39;mt-picker&#39;: Picker
    },
    props: {},
    data () {
      return {
       myAddressSlots: [
          {
            flex: 1,
            defaultIndex: 1,    
            values: Object.keys(myaddress),  //省份数组
            className: &#39;slot1&#39;,
            textAlign: &#39;center&#39;
          }, {
            pider: true,
            content: &#39;-&#39;,
            className: &#39;slot2&#39;
          }, {
            flex: 1,
            values: [],
            className: &#39;slot3&#39;,
            textAlign: &#39;center&#39;
          },
          {
            pider: true,
            content: &#39;-&#39;,
            className: &#39;slot4&#39;
          },
          {
            flex: 1,
            values: [],
            className: &#39;slot5&#39;,
            textAlign: &#39;center&#39;
          }
        ],
        myAddressProvince:&#39;省&#39;,
        myAddressCity:&#39;市&#39;,
        myAddresscounty:&#39;区/县&#39;,
      }
    },
    created() {


    },
    methods: {
     onMyAddressChange(picker, values) {
       if(myaddress[values[0]]){  //这个判断类似于v-if的效果（可以不加，但是vue会报错，很不爽）
          picker.setSlotValues(1,Object.keys(myaddress[values[0]])); // Object.keys()会返回一个数组，当前省的数组
          picker.setSlotValues(2,myaddress[values[0]][values[1]]); // 区/县数据就是一个数组
          this.myAddressProvince = values[0];
          this.myAddressCity = values[1];
          this.myAddresscounty = values[2];
        }
      },
    },
    mounted(){
      this.$nextTick(() => { //vue里面全部加载好了再执行的函数  （类似于setTimeout）
        this.myAddressSlots[0].defaultIndex = 0    
        // 这里的值需要和 data里面 defaultIndex 的值不一样才能够初始化
        //因为我没有看过源码（我猜测是因为数据没有改变，不会触发更新）
      });
    }
  }
</script>