Angular Component的職責(zé)：

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(zé)就是提供user experience，除此別無(wú)其他。一個(gè)Component應(yīng)當(dāng)包含properties和方法，用于數(shù)據(jù)綁定，以及作為視圖(通過(guò)模板渲染而成)和應(yīng)用邏輯之間溝通的渠道。

Angular Service

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

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(jié)

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