如何在app.component外部使用带路由器插座的Angular 9导航栏

import { Component } from '@angular/core';

@Component({
  selector: 'app-navbar',
  template: `
    <nav>
      <ul>
        <li routerLink="/home" routerLinkActive="active">Home</li>
        <li routerLink="/about" routerLinkActive="active">About</li>
        <li routerLink="/contact" routerLinkActive="active">Contact</li>
      </ul>
    </nav>
    <router-outlet></router-outlet>
  `,
  styles: [`
    .active {
      font-weight: bold;
    }
  `]
})
export class NavbarComponent {}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouterModule } from '@angular/router';

import { AppComponent } from './app.component';
import { NavbarComponent } from './navbar.component';

@NgModule({
  declarations: [
    AppComponent,
    NavbarComponent
  ],
  imports: [
    BrowserModule,
    RouterModule.forRoot([
      { path: '', redirectTo: '/home', pathMatch: 'full' },
      { path: 'home', component: HomeComponent },
      { path: 'about', component: AboutComponent },
      { path: 'contact', component: ContactComponent }
    ])
  ],
  exports: [
    NavbarComponent
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

<app-navbar></app-navbar>