# 函数钩子

函数钩子是一种特殊的钩子，功能和 [graphql-gou-zi](https://docs.fireboom.io/jin-jie-gou-zi-ji-zhi/graphql-gou-zi "mention")类似，都用于自行定义业务逻辑。

但区别在于，graphql钩子本质上是graphql数据源，将被合并到超图中，然后基于构建的OPERATION，暴露到客户端。

<figure><img src="https://2707494476-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FNx22Cp3wzkuW1siRbMwW%2Fuploads%2FtTuHmN1tECA0Nwi3jBU9%2Fimage.png?alt=media&#x26;token=3fc7647d-2fb9-4476-a743-ec1c7a58e55c" alt=""><figcaption></figcaption></figure>

而每个函数钩子都会按照规则，注册对应路由，直接暴露到客户端。


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