此时，我们已经将导航器的结构设置完毕。

At this point, we have the structure of our navigator set up.

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之后，请求也设置好了，回调函数也已分配，请求亦发送完毕。

Then the request is set up, the callback function is assigned, and the request is sent.

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之后，请求也设置好了，回调函数也已分配，请求亦发送完毕。

Then the request is set up, the callback function is assigned, and the request is sent.

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