在Angular 6中包含相应组件的子路由

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { ParentComponent } from './parent.component';
import { ChildComponent } from './child.component';

const routes: Routes = [
  {
    path: 'parent',
    component: ParentComponent,
    children: [
      {
        path: 'child',
        component: ChildComponent
      }
    ]
  }
];

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

<!-- parent.component.html -->
<h1>Parent Component</h1>
<router-outlet></router-outlet>