zgo/src/app/app-routing.module.ts

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { PostCreateComponent } from './posts/post-create/post-create.component';
import { PostListComponent } from './posts/post-list/post-list.component';
import { ViewerComponent } from './viewer/viewer.component';
import { LoginComponent } from './login/login.component';
import { AuthGuardService } from './auth-guard.service';

const routes: Routes = [
	{ path: '', component: LoginComponent },
	{ path: 'create', component: PostCreateComponent, canActivate: [AuthGuardService]},
	{ path: 'view', component: PostListComponent, canActivate: [AuthGuardService]},
	{ path: 'login', component: LoginComponent}
];

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