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

<script>
  import { Picker } from 'mint-ui';
  import myaddress from '../../../static/address3.json'     //引入省市區(qū)數據
  export default {
    name: '',
    components: {
      'mt-picker': Picker
    },
    props: {},
    data () {
      return {
       myAddressSlots: [
          {
            flex: 1,
            defaultIndex: 1,    
            values: Object.keys(myaddress),  //省份數組
            className: 'slot1',
            textAlign: 'center'
          }, {
            divider: true,
            content: '-',
            className: 'slot2'
          }, {
            flex: 1,
            values: [],
            className: 'slot3',
            textAlign: 'center'
          },
          {
            divider: true,
            content: '-',
            className: 'slot4'
          },
          {
            flex: 1,
            values: [],
            className: 'slot5',
            textAlign: 'center'
          }
        ],
        myAddressProvince:'省',
        myAddressCity:'市',
        myAddresscounty:'區(qū)/縣',
      }
    },
    created() {


    },
    methods: {
     onMyAddressChange(picker, values) {
       if(myaddress[values[0]]){  //這個判斷類似于v-if的效果（可以不加，但是vue會報錯，很不爽）
          picker.setSlotValues(1,Object.keys(myaddress[values[0]])); // Object.keys()會返回一個數組，當前省的數組
          picker.setSlotValues(2,myaddress[values[0]][values[1]]); // 區(qū)/縣數據就是一個數組
          this.myAddressProvince = values[0];
          this.myAddressCity = values[1];
          this.myAddresscounty = values[2];
        }
      },
    },
    mounted(){
      this.$nextTick(() => { //vue里面全部加載好了再執(zhí)行的函數  （類似于setTimeout）
        this.myAddressSlots[0].defaultIndex = 0    
        // 這里的值需要和 data里面 defaultIndex 的值不一樣才能夠初始化
        //因為我沒有看過源碼（我猜測是因為數據沒有改變，不會觸發(fā)更新）
      });
    }
  }
</script>