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>