napi_callback

用户提供的原生函数的函数指针类型，这些函数将通过 Node-API 公开给 JavaScript。回调函数应满足以下签名：

¥Function pointer type for user-provided native functions which are to be exposed to JavaScript via Node-API. Callback functions should satisfy the following signature:

typedef napi_value (*napi_callback)(napi_env, napi_callback_info); 拷贝

除非出于 对象生命周期管理 中讨论的原因，否则无需在 napi_callback 中创建句柄和/或回调范围。

¥Unless for reasons discussed in Object Lifetime Management, creating a handle and/or callback scope inside a napi_callback is not necessary.