In essence, deferreds are a generalization of scheduled callbacks, but allow techniques such as chaining dependent callbacks and handling error conditions in these chains.

实际上，延迟是对象被调度回调的泛化，但它们也允许使用诸如链接依赖回调和在这些链接中进行错误条件处理之类的技术。

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In essence, deferreds are a generalization of scheduled callbacks, but allow techniques such as chaining dependent callbacks and handling error conditions in these chains.

实际上，延迟是对象被调度回调的泛化，但它们也允许使用诸如链接依赖回调和在这些链接中进行错误条件处理之类的技术。

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