callback

基本解释

Its parameters are callback functions: one for success, and one for failure.
它的参数是回调函数：一个用于成功，一个用于失败。
Callback service provides asynchronous communication from a service provider back to its client.
回调服务提供从服务提供者回到其客户机的异步通信。
But if you don't write code to do something in that callback, nothing will get reported to your code or to the application client.
但是，如果不在该回调中编写要做某事的代码，则代码或应用程序客户机将得不到任何报告。

The APIs can work in both directions, serving the content and triggering callback functions to report on user activity.
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In a recent job search workshop I led, a talented, well-educated and experienced professional listed a number of callback interviews that went nowhere.
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