问RouterLinkActive "isActive“总是真实的

EN

<div class="row">
    <nav class="nav-inner col-xs-12 col-sm-12 col-md-12 col-lg-12">
        <ul class="adminnoivossite">
            <li class="">
                <a [routerLink]="['/admin/evento/informacoes']" [routerLinkActive] #rla="routerLinkActive" [routerLinkActiveOptions]="{exact: true}" alt="Informações" title="Informações">
                    <div class="icon icon-info" [class.active]="rla.isActive"></div>
                    <label>Informações</label>
                </a>
            </li>
            <li class="">
                <a [routerLink]="['/admin/evento/rsvp']" [routerLinkActive] #rla="routerLinkActive" [routerLinkActiveOptions]="{exact: true}" alt="RSVP" title="RSVP">
                    <div class="icon icon-rsvp" [class.active]="rla.isActive"></div>
                    <label>RSVP</label>
                </a>
            </li>
        </ul>
    </nav>
</div>  

const routes: Routes = [
  ...,
  {path: 'admin', loadChildren: './admin/admin.module#AdminModule' }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

const routes: Routes = [
  ...,
  {path: 'evento', loadChildren: './evento/evento.module#EventoModule' }
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class AdminRoutingModule { }

const routes: Routes = [
    {path: 'informacoes', component: EventoInformacoesComponent, canActivate: [UsuarioGuard]}, 
    {path: 'rsvp', component: EventoRsvpComponent, canActivate: [UsuarioGuard]}
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class EventoRoutingModule { }