Angular提供了一些接口，用来介入组件生命周期的几个关键时间点：刚创建时、每次变化时，以及最终被销毁时。
Angular offers a number of interfaces for tapping into critical moments in the component lifecycle: at creation, after each change, and at its eventual destruction.
Angular提供了一些接口，用来介入组件生命周期的几个关键时间点：刚创建时、每次变化时，以及最终被销毁时。
Angular offers a number of interfaces for tapping into critical moments in the component lifecycle: at creation, after each change, and at its eventual destruction.
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