This is a callback example.

这是一个回调的例子。

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Listing 3. Callback Registration.

清单3 .回调注册。

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All you add is a callback function.

您仅需要添加一个回调函数。

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By using the excess capacity of foreign telecommunications firms, callback companies can offer overseas calls in Hong Kong.

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The APIs can work in both directions, serving the content and triggering callback functions to report on user activity.

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In yet another wonderful callback, UNIT troops appear to help Shard employees who are returning to their former, uncontrolled selves.

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