一、效果图

二、完整代码
<template><view><picker mode="multiSelector" @change="bindMultiPickerChange" @columnchange="bindMultiPickerColumnChange":value="multiIndex" :range="multiArray"><view class="picker">{{multiArray[0][multiIndex[0]]}} > {{multiArray[1][multiIndex[1]]}}</view></picker></view>
</template>
<script>export default {data() {return {multiArray: [],multiIndex: [0, 0],array: [{id: 0,name: '大类1',children: [{id: 10,name: '小类1'},{id: 11,name: '小类11'}]},{id: 1,name: '大类2',children: [{id: 20,name: '小类2'}]}],oneId: 0,twoId: 0,}},onLoad() {this.getType()setTimeout(() => {this.initData();}, 1000)},methods: {initData() {console.log('111', this.array);const arrOne = this.array.map(item => {return item.name; });const arrTwo = this.array[0].children.map(item => {return item.name; });this.multiArray[0] = arrOne;this.multiArray[1] = arrTwo;this.oneId = this.array[0].id;this.twoId = this.array[0].children[0].id;},bindMultiPickerColumnChange(e) {console.log(e.detail.column, "e.detail.column表示是第几列表示是第几列")if (e.detail.column === 0) {this.initSelect(e.detail.value);this.multiIndex[0] = e.detail.value;} else if (e.detail.column === 1) {this.multiIndex[1] = e.detail.value;console.log('detailvalue', e.detail.value);this.twoId = this.array[this.multiIndex[0]].children[this.multiIndex[1]].id;}console.log(this.oneId, "打印第一列id");console.log(this.twoId, "打印第二列id");},initSelect(index) {this.oneId = this.array[index].id; this.multiIndex[1] = 0; this.$set(this.multiArray, 1, []); if (this.array[index].children.length == 0) {console.log("如果右边长度等于0,那么清掉右边ID");this.twoId = "";} else {const arrTwo = this.array[index].children.map(item => {return item.name; });this.$set(this.multiArray, 1, arrTwo); this.twoId = this.array[index].children[0].id; }},bindMultiPickerChange(e) {console.log(this.oneId);console.log(this.twoId);},getType() { uni.request({url: 'https:success: (res) => {console.log(res.data);this.array = res.data.types.map((item, index) => {return {...item,children: res.data.goods[index]}})console.log('array', this.array);}})},}}
</script><style>.uni-picker-tips {font-size: 12px;color: #666;margin-bottom: 15px;padding: 0 15px;}
</style>