回调类处理服务器返回的数据。
The callback class will process the data returned from the server.
仔细看看这个由服务器返回的数据的形态。
Pay close attention to the shape of the data returned by the server.
当请求服务器之后，我们需要一个函数去接受服务器返回的数据。
After a request to a server, we need a function to receive the data returned from the server.
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