This callback object can then process this response on behalf of the client or hand it over to the client.
然后该回调对象就可以代表客户机处理此响应，或者将其移交给客户机。
You can pass an optional data object and callback function if you need them.
如果需要的话，您还可以传递一个可选的数据对象和回调函数。
Each method provides a callback object so that you are notified asynchronously when the remote procedure call is complete.
每个方法都提供了一个回调对象，这样就可以在完成远程过程调用后收到异步通知。
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