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

<script>
 import { Picker } from 'mint-ui';
 import myaddress from '../../../static/address3.json' //引入省市区数据
 export default {
 name: '',
 components: {
 'mt-picker': Picker
 },
 props: {},
 data () {
 return {
 myAddressSlots: [
  {
  flex: 1,
  defaultIndex: 1, 
  values: Object.keys(myaddress), //省份数组
  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:'区/县',
 }
 },
 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>