<picker-view indicator-style="height: 50px;" style="width:100%; height: 400rpx;" bindchange="bindChange">
 <picker-view-column class="selectItem">
 <view class="tooth" wx:for="{{province}}" wx:key="this">{{item.name}}</view>
 </picker-view-column>
 <picker-view-column class="selectItem">
 <view class="tooth" wx:for="{{city}}" wx:key="this">{{item.name}}</view>
 </picker-view-column>
 <picker-view-column class="selectItem">
 <view class="tooth" wx:for="{{area}}" wx:key="this">{{item.name}}</view>
 </picker-view-column>
</picker-view>

 // 把数据格式化成页面现实的形式
 formatCityData: function () {
 var that = this,
 region = that.data.region,
 selectItems = [],
 province = [],
 city = [],
 area = [],
 area_index = that.data.area_index,
 city_index = that.data.city_index,
 province_index = that.data.province_index;
 // 第一遍格式化数据，
 for (var i = 0; i < region.length; i++) {
 if (region[i].parent_id == 1) {
 var provinceItem = region[i];
 var selectItem1 = { label: provinceItem.zh_name, provinceId: provinceItem.id, children: [] };
 for (var j = 0; j < region.length; j++) {
  if (region[j].parent_id == provinceItem.id) {
  var cityItem = region[j];
  var selectItem2 = { label: cityItem.zh_name, cityId: cityItem.id, children: [] };
  selectItem1.children.push(selectItem2);
  for (var k = 0; k < region.length; k++) {
  if (region[k].parent_id == cityItem.id) {
  var areaItem = region[k];
  var selectItem3 = { label: areaItem.zh_name, areaId: areaItem.id, children: [] };
  selectItem2.children.push(selectItem3);
  }
  }
  }
 }
 selectItems.push(selectItem1);
 }
 }
 // 遍历所有的数据。将省的名字放在对应的数组中
 for (let i = 0; i < selectItems.length; i++) {
 province.push({
 name: selectItems[i].label,
 id: selectItems[i].provinceId
 });
 }
 if (selectItems[province_index].children && selectItems[province_index].children) {// 判断选中的省级里面有没有市
 if (selectItems[province_index].children[city_index]) {
 for (let i = 0; i < selectItems[province_index].children.length; i++) {
  city.push({
  name: selectItems[province_index].children[i].label,
  id: selectItems[province_index].children[i].cityId
  });
 }
 if (selectItems[province_index].children[city_index].children) {
  if (selectItems[province_index].children[city_index].children[area_index]) {
  for (let i = 0; i < selectItems[province_index].children[city_index].children.length; i++) {
  area.push({
  name: selectItems[province_index].children[city_index].children[i].label,
  id: selectItems[province_index].children[city_index].children[i].areaId
  });
  }
  } else {
  that.setData({
  area_index: 0
  });
  for (let i = 0; i < selectItems[province_index].children[city_index].childre.length; i++) {
  area.push({
  name: selectItems[province_index].children[city_index].children[i].label,
  id: selectItems[province_index].children[city_index].children[i].areaId
  });
  }
  }
 } else {
  area.push({
  name: province[province_index].children[city_index].label,
  id: province[province_index].children[city_index].areaId
  });
 }
 } else {
 that.setData({
  city_index: 0
 });
 for (let i = 0; i < selectItems[province_index].childre.length; i++) {
  city.push({
  name: selectItems[province_index].children[i].label,
  id: selectItems[province_index].children[i].cityId
  });
 }
 }
 } else {
 // 如果该省没有市，那么就把省的名字作为市和区的名字
 city.push({
 name: province[province_index].label,
 id: province[province_index].cityId
 });
 area.push({
 name: province[province_index].label,
 id: province[province_index].areaId
 });
 }
 // 选择成功后把对应的数组赋值给相应的变量
 that.setData({
 province: province,
 city: city,
 area: area
 });
 provincialCity = {
 province: {
 name: province[that.data.province_index].name,
 id: province[that.data.province_index].id,
 },
 city: {
 name: city[that.data.city_index].name,
 id: city[that.data.city_index].id
 },
 area: {
 name: area[that.data.area_index].name,
 id: area[that.data.area_index].id
 } 
 }
 },

// 选择城市
 bindChange: function (e) {
 const val = e.detail.value;
 this.setData({
 province_index: val[0],
 city_index: val[1],
 area_index: val[2]
 });
 this.formatCityData();
 },

this.data.province.map(function(val, key) {
 if (val.id === that.data.result.province.id) {
 provinceId = key;
 }
 return provinceId;
 })
 this.setData({
 province_index: provinceId
 });
 this.formatCityData();
 this.data.city.map(function(val, key) {
 if (val.id === that.data.result.city.id) {
 cityId = key;
 }
 return cityId;
 })
 this.setData({
 city_index: cityId
 });
 this.formatCityData();
 this.data.area.map(function (val, key) {
 if (val.id === that.data.result.area.id) {
 areaId = key;
 }
 return areaId;
 })
 var lists = [provinceId, cityId, areaId];
 this.setData({ cityShow: lists });