RouterLink在Angular 6中不起作用

我当时正在看Brad Traversy教程。我完全按照说的做。
这是我的 app.module.ts。

I was coding watching a Brad Traversy tutorial. and I did exactly as it is said. this is my 'app.module.ts'.

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

import { AppComponent } from './app.component';
import { NavbarComponent } from './components/navbar/navbar.component';
import { LoginComponent } from './components/login/login.component';
import { RegisterComponent } from './components/register/register.component';
import { HomeComponent } from './components/home/home.component';
import { ProfileComponent } from './components/profile/profile.component';
import { DashboardComponent } from './components/dashboard/dashboard.component';

const appRoutes: Routes = [
  {path:'', component: HomeComponent},
  {path:'register', component: RegisterComponent},
  {path:'login', component: LoginComponent},
  {path:'dashboard', component: DashboardComponent},
  {path:'profile', component: ProfileComponent}
] 
@NgModule({
  declarations: [
    AppComponent,
    NavbarComponent,
    LoginComponent,
    RegisterComponent,
    HomeComponent,
    ProfileComponent,
    DashboardComponent
  ],
  imports: [
    BrowserModule,
    RouterModule.forRoot(appRoutes) // appRoutes: an object

  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

这是我的导航栏组件

 <li><a class="nav-link" [routerLink] = "['/']" [routerLinkActive]=" 
['active']">Home</a></li>
 <li><a class="nav-link" [routerLink] = "['/login']" [routerLinkActive]=" 
['active']">Login</a></li>

我还添加了

<base href="/">

到index.html文件。

to the index.html file.

当我删除RouterLink部件时，页面运行良好。当我在URL中提供路径时，它将显示组件内部的内容。

When I remove the RouterLink part the pages are working good.it displays the content inside the components when I give the path in the URL.

我检查了几个问题。