解决Angular 2中“路由器出口不是已知元素”问题

typescript
// app-routing.module.ts
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { HomeComponent } from './home.component';
import { AboutComponent } from './about.component';
const routes: Routes = [
  { path: 'home', component: HomeComponent },
  { path: 'about', component: AboutComponent },
  // ... other routes
];
@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

typescript
// app.component.ts
import { Component } from '@angular/core';
@Component({
  selector: 'app-root',
  template: `
    
My Angular App
    
    
  `
})
export class AppComponent { }