uniapp如何实现picker二级联动选择?
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效果

代码
<template>
<view class="content">
<view class="content-box">
<view class="box">
<view class="box-item">
<picker class="item-picker"
mode="multiSelector"
range-key="name"
@change="classifyChange"
@columnchange="columnchange"
:value="classifyIndex"
:range="classifyArr">
<view>{{ name }}</view>
</picker>
</view>
</view>
</view>
</view>
</template>
js
<script>
export default {
data() {
return {
dataSource: [
{ id: 1,
name: '星期一',
child: [
{
id: 2,
name: '星期一晴天'
},
{
id: 3,
name: '星期一雨天'
},
],
},
{ id: 4,
name: '星期二',
child: [
{
id: 5,
name: '星期二暴雨'
},
{
id: 6,
name: '星期二转晴'
},
{
id: 7,
name: '星期二冰雹'
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