callback

基本解釋

Its parameters are callback functions: one for success, and one for failure.
它的參數是回調函數：一個用于成功，一個用于失敗。
Callback service provides asynchronous communication from a service provider back to its client.
回調服務提供從服務提供者回到其客戶機的異步通信。
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，如果不在該回調中編寫要做某事的代碼，則代碼或應用程序客戶機將得不到任何報告。

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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