微信小程序实现省市区三级地址选择 picker

一.wxml

    <view class="section">
            <picker mode="region" bindchange="bindRegionChange" value="{
  
  {region}}" custom-item="{
  
  {customItem}}">
                 <view class="picker">
                         <view class="row">
                            <view class="sign">省份</view>
                            <input placeholder="请选择省份" value="{
  
  {region[0]}}"></input>
                          </view>
                          <view class="row" wx:if="{
  
  {city==true}}">
                            <view class="sign">城市</view>
                            <input placeholder="请选择城市" value="{
  
  {region[1]}}"></input>
                          </view>
                          <view class="row" wx:if="{
  
  {city==true}}">
                            <view class="sign">区县</view>
                            &l