Angular Component的職責：

Ideally, a component’s job is to enable the user experience and nothing more. A component should present properties and methods for data binding, in order to mediate between the view (rendered by the template) and the application logic (which often includes some notion of a model).

理想情況下，Angular Component唯一的職責就是提供user experience，除此別無其他。一個Component應當包含properties和方法，用于數據綁定，以及作為視圖(通過模板渲染而成)和應用邏輯之間溝通的渠道。

Angular Service

通過@Injectable()這個裝飾器將一個class定義成Angular服務。

To define a class as a service in Angular, use the @Injectable() decorator to provide the metadata that allows Angular to inject it into a component as a dependency.

總結

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