多列选择器设置value无效？一直是选择每列的第一项
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建议查看这个文档：https://developers.weixin.qq.com/miniprogram/dev/component/picker-view.html
多组我都是picker-view 里面塞多个picker-view-column，谈起动画，自己用animation写个
先参考下文档及示例代码
https://developers.weixin.qq.com/miniprogram/dev/component/picker.html#%E7%A4%BA%E4%BE%8B%E4%BB%A3%E7%A0%81