angular-docs-cn/modules/angular2/docs/cheatsheet/class-decorators.md

@cheatsheetSection Class decorators @cheatsheetIndex 4 @description import {Directive, ...} from 'angular2/angular2';

@cheatsheetItem @Component({...}) class MyComponent() {}|@Component({...}) Declares that a class is a component and provides metadata about the component.

@cheatsheetItem @Pipe({...}) class MyPipe() {}|@Pipe({...}) Declares that a class is a pipe and provides metadata about the pipe.

@cheatsheetItem @Injectable() class MyService() {}|@Injectable() Declares that a class has dependencies that should be injected into the constructor when the dependency injector is creating an instance of this class.