微信小程序 动态添加VIEW

参考资料
https://developers.weixin.qq.com/miniprogram/dev/component/picker-view.html
https://blog.csdn.net/hxfghgh/article/details/80521890

	<picker-view indicator-style="height: 25px;" style="width: 75%; height: 50px; font-size: 30rpx;" value="{{choice}}" id = choiceIdx bindchange="bindChange">
		<picker-view-column wx:for="{{choice}}" wx:key="choice" wx:for-index="choiceIdx">
			<view wx:for="{{viewDatas[choiceIdx]}}" wx:key="id"  wx:for-index="viewDatasIdx">{{viewDatas[choiceIdx][viewDatasIdx].name}}</view>
		</picker-view-column>
	</picker-view>

嵌套两层循环，外面一层循环choice 里面是picker的值
第二层是viewDatas 按照choice里面的数据显示

根据前面的选项改变后面的选项