<picker
 mode="region"
 bindchange="bindRegionChange"
 value="{{region}}"
 custom-item="{{customItem}}"
 >

{
 "code": 0,
 "msg": "success",
 "data": [
 {
  "id": 2,
  "name": "北京",
  "children": [
  {
   "id": 36,
   "name": "北京市"
  }
  ]
 }
 ]
}

<picker
  mode="multiSelector"
  @change="bindCityChange"
  @columnchange="bindCityColumnChange"
  :value="multiIndex"
  :range="multiArray"
  range-key="name"
 >
  <view class="picker">选择城市{{userInfo.province.name}},{{userInfo.city.name}}</view>
 </picker>

 mode="multiSelector"

[["北京", "湖南"], ["长沙", "永州"]]

// 城市选择 获取选中的值 [0,0] 这里需要注意的是获取值的方式在mpvue中通过e.mp.detail.value而不是e.detail.value
 bindCityChange(e) {
 // 选中的值索引
 console.log(e.mp.detail.value[0], e.mp.detail.value[1]);
 // 选中的省份和城市数据
 console.log(
 this.multiArray[0][e.mp.detail.value[0]],
 this.multiArray[1][e.mp.detail.value[1]]
 );
 this.userInfo.province = this.multiArray[0][e.mp.detail.value[0]];
 this.userInfo.city = this.multiArray[1][e.mp.detail.value[1]];
 },

console.log(
 "修改的列为",
 e.mp.detail.column,
 "，值为",
 e.mp.detail.value
 );

// 监听滚动事件 滚动第一列 修改第二列数据
 bindCityColumnChange(e) {
 // 更新multiIndex的值
 this.multiIndex[e.mp.detail.column] = e.mp.detail.value;
 //加载对应省份下城市数据
 switch (e.mp.detail.column) {
 case 0:
  // this.multiArray[1] = this.cityList[e.mp.detail.value].children;
  this.multiArray = [
  this.cityList,
  this.cityList[e.mp.detail.value].children
  ];
  break;
 }
 },

data() {
 return {
multiIndex: [0, 0],
 multiArray: [],
 }
 }