The property callback is a function that registers the same property type information for the component properties.

属性回调是为组件属性注册相同属性类型信息的一项功能。

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The callback class can implement any type of handling you want to use to verify the combination of username and password, so it's a technique that allows maximum flexibility.

这个回调类可以实现您需要的任何用户名和密码组合检验方法，所以这种技术非常灵活。

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The strategy provider, as a potential observer of a strategy consumer, looks for RFSS web services, checks the type of request, and registers for a callback to execute the particular strategy.

策略提供者是策略消费者的潜在观察者，它会查找 RFSS Web 服务，检查请求者的类型，注册一个回调方法，以执行特定的策略。

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