嵌套路由

1.在app-routing.module.ts文件中配置路由

	const routes: Routes = [{path:"home",component:HomeComponent,children:[{path:'tabbar',component:TabbarComponent},{path:'footer',component:FooterComponent},]},{path:"profile",component:ProfileComponent},];

2.在home组件的html中

这里的url需要包含父路由，也就是home

	<a [routerLink]="[ '/home/tabbar' ]">tabbar</a><a [routerLink]="[ '/home/footer' ]">footer</a><router-outlet></router-outlet>