在这个模块中，我们声明了一个这种类型的函数来处理到达的数据。

In the module, I declare a function of this type to deal with the incoming data.

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在这种情况下，当服务器响应到达浏览器时，回调函数会处理服务器响应。

In that case, the server response is handled by the callback function when the server response arrives at the browser.

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最后，receiver类将其自身作为PostServiceListener进行提交，这样，当通知到达时，post服务将回调posted函数。

Finally, the Receiver class submits itself as a PostServiceListener so that the post service calls the posted function back when a notification arrives.

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