vue mint-ui imitation Taobao Jingdong delivery address four-level linkage

import { Picker } from 'mint-ui'; //前提是npm install mint-ui -S

Vue.component(Picker.name, Picker);

 <mt-picker :slots="addressSlots" class="picker" @change="onAddressChange" :visible-item-count="5" ></mt-picker >

<mt-picker :slots="streetSlots" ref="picker" class="picker" @change="onStreetChange" :visible-item-count="5" ></mt-picker >
上门服务地址:{{ addressProvince }} {{ addressCity }}

<script type="text/ecmascript-6" >
 
 import s from &#39;../../statics/mobile/json/address4.json&#39;
 
 export default {
  name: &#39;address&#39;,
  data () {
   return {
    companyName:&#39;&#39;,
    addressSlots: [
     {
      flex: 1,
      defaultIndex: 1,
      values: Object.keys(s),
      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;
     }
    ],
    streetSlots: [
     {
      flex: 1,
      values: [],
      className: &#39;slot1&#39;,
      textAlign: &#39;center&#39;
     }
    ],
    addressProvince: &#39;省&#39;,
    addressCity: &#39;市&#39;,
    addressXian: &#39;区&#39;,
    addressStreet: &#39;街道&#39;,
    
   }
  },
  methods: {
   
   onAddressChange(picker, values) {
    let sheng = Object.keys(s);
    let shi = Object.keys(s[values[0]]);

　　　　　　let index=shi.indexOf(values[1])
　　　　　　let xian = s[values[0]][shi[index]];
　　　　　this.xianObj = xian;
    picker.setSlotValues(1, shi);
    this.addressProvince = values[0];
    this.addressCity = values[1];
    this.addressXian = values[2];
    picker.setSlotValues(2, Object.keys(xian));
   },
   onStreetChange(picker, values){
    this.addressStreet = values[0]
   },
  
  
  },
  watch: {
   &#39;addressXian&#39;: {
    handler(val, oval){
     let street = this.xianObj[this.addressXian]
     this.streetSlots[0].values = street
    }
   }
  },
  created(){
   
  },
  mounted(){
   this.$nextTick(() => {
    setTimeout(() => {//这个是一个初始化默认值的一个技巧
     this.addressSlots[0].defaultIndex = 0;
    }, 100);
   });



  }
 }
</script >