在路由器配置中添加一个属性skipLocationChange，并将其设置为true。示例代码如下：

const routes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'dashboard', component: DashboardComponent,
    children: [
      { path: '', redirectTo: 'overview', pathMatch: 'full' },
      { path: 'overview', component: OverviewComponent, outlet: 'dashboard' },
      { path: 'stats', component: StatsComponent, outlet: 'dashboard' }
    ]
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule],
  providers: []
})
export class AppRoutingModule { }

此代码中，skipLocationChange属性被添加到路由器配置中。这将告诉路由器在更改路由时不更改URL。这是为了防止在命名的路由器出口中出现意外行为。

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent,
    DashboardComponent,
    OverviewComponent,
    StatsComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

此代码中，AppModule被导入了AppRoutingModule。这是为了确保路由器可以使用上面定义的路由器配置。