Interface that a class can implement to be a guard deciding if a children can be loaded.
一个接口，某些类可以实现它以扮演一个守卫，来决定该路由的子路由能否加载。
说明
class UserToken {} class Permissions { canLoadChildren(user: UserToken, id: string): boolean { return true; } } @Injectable() class CanLoadTeamSection implements CanLoad { constructor(private permissions: Permissions, private currentUser: UserToken) {} canLoad(route: Route): Observable<boolean>|Promise<boolean>|boolean { return this.permissions.canLoadChildren(this.currentUser, route); } } @NgModule({ imports: [ RouterModule.forRoot([ { path: 'team/:id', component: TeamCmp, loadChildren: 'team.js', canLoad: [CanLoadTeamSection] } ]) ], providers: [CanLoadTeamSection, UserToken, Permissions] }) class AppModule {}You can alternatively provide a function with the canLoad signature:
你还可以转而提供一个具有 canLoad 签名的函数：
@NgModule({ imports: [ RouterModule.forRoot([ { path: 'team/:id', component: TeamCmp, loadChildren: 'team.js', canLoad: ['canLoadTeamSection'] } ]) ], providers: [ { provide: 'canLoadTeamSection', useValue: (route: Route) => true } ] }) class AppModule {}方法
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canLoad(route: Route): Observable<boolean> | Promise<boolean> | boolean参数返回值Observable<boolean> | Promise<boolean> | boolean
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