<view class="container"> <form catchsubmit="formSubmit">  <view class="form-card">   <view class="weui-cell weui-cell_input">    <view class="weui-cell__hd">     <view class="weui-label">物種<span>*</span></view>    </view>    <view class="weui-cell__bd">     <picker mode="multiSelector" bindchange="bindMultiPickerChange" bindcolumnchange="bindMultiPickerColumnChange" value="{{multiIndex}}" range="{{multiArray}}">      <view class="weui-input">{{multiArray[0][multiIndex[0]]}}{{multiArray[1][multiIndex[1]]}}{{multiArray[2][multiIndex[2]]}}</view>     </picker>    </view>   </view>  </view> </form>  </view>

Page({  /**  * 頁(yè)面的初始數(shù)據(jù)  */ data: {  objectMultiShow: [],  objectMultiArray: [],  multiArray: [],  multiIndex: [],  checkeIndex: [] },  /**  * 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面加載  * objectMultiShow--匹配多列選擇器渲染數(shù)據(jù)所對(duì)應(yīng)的json數(shù)據(jù)（包含id，parentId，name）  * multiArray--多列選擇器渲染數(shù)據(jù)  */ onLoad: function (options) {  // 初始化  let data = {   objectMultiShow: this.data.objectMultiShow,   objectMultiArray: this.data.objectMultiArray,   multiArray: this.data.multiArray,   multiIndex: this.data.multiIndex,   checkeIndex: this.data.checkeIndex  }  data.objectMultiArray = [   [{ id: 0, name: '無(wú)脊柱動(dòng)物' }, { id: 1, name: '脊柱動(dòng)物' }],   [    { id: 0, name: '扁性動(dòng)物', parentId: 0 }, { id: 1, name: '線形動(dòng)物', parentId: 0 }, { id: 2, name: '環(huán)節(jié)動(dòng)物', parentId: 0 }, { id: 3, name: '軟體動(dòng)物', parentId: 0 }, { id: 4, name: '節(jié)肢動(dòng)物', parentId: 0 },    { id: 5, name: '魚(yú)', parentId: 1 }, { id: 6, name: '兩棲動(dòng)物', parentId: 1 }, { id: 7, name: '爬行動(dòng)物', parentId: 1 }   ],   [    { id: 0, name: '豬肉絳蟲(chóng)', parentId: 0 }, { id: 1, name: '吸血蟲(chóng)', parentId: 0 },    { id: 2, name: '蛔蟲(chóng)', parentId: 1 },    { id: 3, name: '螞蟻', parentId: 2 }, { id: 4, name: '螞蟥', parentId: 2 },    { id: 5, name: '河蚌', parentId: 3 }, { id: 6, name: '蝸牛', parentId: 3 }, { id: 7, name: '蛞蝓', parentId: 3 },    { id: 8, name: '昆蟲(chóng)', parentId: 4 }, { id: 9, name: '甲殼動(dòng)物', parentId: 4 }, { id: 10, name: '蛛形動(dòng)物', parentId: 4 }, { id: 11, name: '多足動(dòng)物', parentId: 4 },    { id: 3, name: '鯽魚(yú)', parentId: 5 }, { id: 4, name: '帶魚(yú)', parentId: 5 },    { id: 3, name: '青蛙', parentId: 6 }, { id: 4, name: '娃娃魚(yú)', parentId: 6 },    { id: 3, name: '蜥蜴', parentId: 7 }, { id: 4, name: '龜', parentId: 7 }, { id: 4, name: '壁虎', parentId: 7 },   ]  ]  data.objectMultiShow = data.objectMultiArray.map((item, index) => {   if (index > 0) {    item = item.filter(i => i.parentId === data.objectMultiArray[index - 1][0].id)   }   return item  })  data.multiArray = data.objectMultiShow.map(item => {   item = item.map(i => i.name)   return item  })  console.log(data.multiIndex)  // 數(shù)據(jù)更新  this.setData(data) },  bindMultiPickerChange: function (e) {  console.log('picker發(fā)送選擇改變，攜帶值為', e.detail.value)  this.setData({   multiIndex: e.detail.value  }) }, bindMultiPickerColumnChange: function (e) {  console.log('修改的列為', e.detail.column, '，值為', e.detail.value);  // 初始化數(shù)據(jù)  var data = {   objectMultiShow: this.data.objectMultiShow,   multiArray: this.data.multiArray,   multiIndex: this.data.multiIndex  };   // 改變第i列數(shù)據(jù)之后，后幾列選擇第0個(gè)選項(xiàng)（重置）  data.multiIndex[e.detail.column] = e.detail.value;  for (let i = e.detail.column; i < data.multiIndex.length - 1; i++) {   data.multiIndex[i + 1] = 0  }   /**   * 改變第i列數(shù)據(jù)之后，后幾列數(shù)據(jù)更新   * 兩種寫(xiě)法：for 和 switch，switch為三列選擇器寫(xiě)法，for由switch精簡(jiǎn)拓展過(guò)來(lái)，可用于多列選擇器   * swich寫(xiě)法：如果更改的是第一列數(shù)據(jù)，第二列數(shù)據(jù)通過(guò)filter篩選（parentId = 第一列選中項(xiàng)id），同時(shí)更新第三列數(shù)據(jù)   *      如果更改的是第二列數(shù)據(jù)，更新第三列數(shù)據(jù) 通過(guò)filter篩選（parentId = 第二列選中項(xiàng)id）   */  let arry = this.data.objectMultiArray  for (let i = e.detail.column; i < data.multiIndex.length - 1; i++) {   data.objectMultiShow[i + 1] = arry[i + 1].filter(item => item.parentId === data.objectMultiShow[i][data.multiIndex[i]].id)   data.multiArray[i + 1] = data.objectMultiShow[i + 1].map(item => item.name)  }  /*switch (e.detail.column) {   case 0:    data.objectMultiShow[1] = arry[1].filter(item => item.parentId === data.objectMultiShow[0][data.multiIndex[0]].id)    data.multiArray[1] = data.objectMultiShow[1].map(item => item.name)    data.objectMultiShow[2] = arry[2].filter(item => item.parentId === data.objectMultiShow[1][data.multiIndex[1]].id)    data.multiArray[2] = data.objectMultiShow[2].map(item => item.name)    break;   case 1:    data.objectMultiShow[2] = arry[2].filter(item => item.parentId === data.objectMultiShow[1][data.multiIndex[1]].id)    data.multiArray[2] = data.objectMultiShow[2].map(item => item.name)  }*/  // 數(shù)據(jù)更新  this.setData(data); }})