如何让picker-view上下级联动
一共有三组数组,1数组里面是大类集合,2、3数组是1数组的小类,如何让picker-view 根据1数组的大类,联动
<picker-view indicator-style="height: 30px;" style="width: 100%; height: 40px;" :value="value" bindchange="bindChange">
<picker-view-column class="box1" >
<view v-for="(item,index) in a2[1]" :key="index" class="item">{{item}}</view>
</picker-view-column>
<picker-view-column>
<view class="item">4级</view>
<view class="item">5级</view>
<view class="item">6级</view>
</picker-view-column>
</picker-view>