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。
You can pass an optional data object and callback function if you need them.
另外,每个方法都接受一个处理从请求返回的数据的回调。
In addition, each takes a callback that handles the returned data from the request.
定义回调函数,以处理通信状态和响应数据。
Define a call-back function to process the communication states and the response data.
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