Interface that a class can implement to be a guard deciding if a route can be deactivated.
一个接口，某些类可以实现它以扮演一个守卫，来决定该路由能否停用。
说明
class UserToken {} class Permissions { canDeactivate(user: UserToken, id: string): boolean { return true; } } @Injectable() class CanDeactivateTeam implements CanDeactivate<TeamComponent> { constructor(private permissions: Permissions, private currentUser: UserToken) {} canDeactivate( component: TeamComponent, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState: RouterStateSnapshot ): Observable<boolean>|Promise<boolean>|boolean { return this.permissions.canDeactivate(this.currentUser, route.params.id); } } @NgModule({ imports: [ RouterModule.forRoot([ { path: 'team/:id', component: TeamCmp, canDeactivate: [CanDeactivateTeam] } ]) ], providers: [CanDeactivateTeam, UserToken, Permissions] }) class AppModule {}You can alternatively provide a function with the canDeactivate signature:
你还可以转而提供具有 canDeactivate 签名的函数：
@NgModule({ imports: [ RouterModule.forRoot([ { path: 'team/:id', component: TeamCmp, canDeactivate: ['canDeactivateTeam'] } ]) ], providers: [ { provide: 'canDeactivateTeam', useValue: (component: TeamComponent, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState: RouterStateSnapshot) => true } ] }) class AppModule {}
