Asynchronous methods should have a Callback type as the last argument.

异步的方法最后一个方法的参数类型应该是Callback。

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In order to attach your function to a message type, your function must match the standard callback function.

为了给信息类型附上一个函数，你的函数必须匹配标准的回调函数。

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The type this callback is being invoked for.

获取要为其调用此回调的类型。

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The type this callback is being invoked for.

获取要为其调用此回调的类型。

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