报错：Encountered two children with the same key, `.$xxx`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
封装antd select 组件时，key换了无数次，各种拼接、转换随机数，都不管用，最终发现value绑定的不是唯一id。
解决：value后面拼接index，再不济拼接随机数就好了，传参时截掉。
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