微信小程序实现选择地址省市区三级联动

onLoad: function(options) {
 var that = this;
 // 此文件为全部省以及第一个省的市和区
 var cityData = districtLoad.districtLoad;
 // 存放省 
 const provinces = [];
 // 存放市
 const citys = [];
 // 存放区
 const countys = [];
 for (let i = 0; i < cityData.length; i++) {
  provinces.push(cityData[i]);
 }
 for (let i = 0; i < cityData[0].sub.length; i++) {
  citys.push(cityData[0].sub[i])
 }
 for (let i = 0; i < cityData[0].sub[0].sub.length; i++) {
  countys.push(cityData[0].sub[0].sub[i])
 }
 that.setData({
  provinces,
  citys,
  countys
 })
 }

bindChange: function(e) {
 var that = this;
 var val = e.detail.value
 var t = this.data.values;
 // 滑动省
 if (val[0] != t[0]) {
  const citys = [];
  const countys = [];
  // 保存市
  for (let i = 0; i < cityData[val[0]].sub.length; i++) {
  citys.push(cityData[val[0]].sub[i])
  }
  // 保存第一个市的全部区
  for (let i = 0; i < cityData[val[0]].sub[0].sub.length; i++) {
  countys.push(cityData[val[0]].sub[0].sub[i])
  }
  // 保存
  this.setData({
  province: cityData[val[0]].name,
  city: cityData[val[0]].sub[0].name,
  citys: citys,
  countys: countys,
  values: val,
  value: [val[0], 0, 0],
  fdeliveryProvince: this.data.provinces[val[0]].code,
  fdeliveryCity: cityData[val[0]].sub[0].code,
  })
  // 防止只有省市的情况
  if (cityData[val[0]].sub[0].sub.length!=0){
  that.setData({
   county: cityData[val[0]].sub[0].sub[0].name,
   fdeliveryArea: cityData[val[0]].sub[0].sub[0].code
  })
  }else {
  that.setData({
   county: '',
   fdeliveryArea:''
  })
  }
  return;
 }
 // 滑动市
 if (val[1] != t[1]) {
  const countys = [];
  // 保存市
  for (let i = 0; i < cityData[val[0]].sub[val[1]].sub.length; i++) {
  countys.push(cityData[val[0]].sub[val[1]].sub[i])
  }
  // 保存
  this.setData({
  city: this.data.citys[val[1]].name,
  countys: countys,
  values: val,
  value: [val[0], val[1], 0],
  fdeliveryCity: this.data.citys[val[1]].code,
  })
  // 防止只有省市的情况
  if (countys.length != 0) {
  that.setData({
   county: cityData[val[0]].sub[val[1]].sub[0].name,
   fdeliveryArea: cityData[val[0]].sub[val[1]].sub[0].code
  })
  } else {
  that.setData({
   county: '',
   fdeliveryArea: ''
  })
  }
  return;
 }
 // 滑动区
 if (val[2] != t[2]) {
  this.setData({
  county: this.data.countys[val[2]].name,
  values: val,
  fdeliveryArea: this.data.countys[val[2]].code
  })
  return;
 }
 }

<view class="citypicker" wx:if="{{condition}}">
 <view class="cityheader">
 <view bindtap="open" class="city-cancel">取消</view>
 <view bindtap="open" class="city-true">确定</view>
 </view>
 <picker-view indicator-style="height: 40px;" style="font-size:30rpx; width: 100%; height: 290px;" value="{{value}}" bindchange="bindChange" class="citybody">
 <picker-view-column>
  <view wx:for="{{provinces}}" wx:key="{{item.name}}" wx:code="{{item.code}}" style="line-height: 40px;padding-left:10px;">{{item.name}}</view>
 </picker-view-column>
 <picker-view-column>
  <view wx:for="{{citys}}" wx:key="{{item.name}}" wx:code="{{item.code}}" style="line-height: 40px;padding-left:10px;">{{item.name}}</view>
 </picker-view-column>
 <picker-view-column>
  <view wx:for="{{countys}}" wx:key="{{item.name}}" wx:code="{{item.code}}" style="line-height: 40px;padding-left:10px;">{{item.name}}</view>
 </picker-view-column>
 </picker-view>
</view>