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测试

避免重复通常是2种形式的去重结合使用较为妥当，客户端去重和服务端去重：

客户端去重也就是js代码中利用前端缓存在用户输入时对当前的context中的数据首先进行去重。

当客户端通过以后，服务端去重有2中方法，首先根据业务逻辑的唯一性选择，数据库unique约束。其次在insert之前如果允许对重复

记录删除则先删除重复记录再insert。再次如果害怕误删，可以对重复的数据标记删除（假删除）并设置允许保留时间或者归档来减小表的占用空间。

校验或者数据表设置唯一键

插入之前，先查询校验