如何在Angular 6库中创建延迟加载的功能模块？

ng generate module feature --route feature --module app.module

const routes: Routes = [
  { path: 'feature', loadChildren: './feature/feature.module#FeatureModule' }
];

const routes: Routes = [
  { path: '', component: FeatureComponent }
];

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

@NgModule({
  declarations: [FeatureComponent],
  imports: [
    CommonModule,
    FeatureRoutingModule
  ]
})
export class FeatureModule { }

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

const routes: Routes = [
  { path: 'feature', loadChildren: './feature/feature.module#FeatureModule' }
];

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

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { FeatureComponent } from './feature.component';

const routes: Routes = [
  { path: '', component: FeatureComponent }
];

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

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FeatureComponent } from './feature.component';
import { FeatureRoutingModule } from './feature-routing.module';

@NgModule({
  declarations: [FeatureComponent],
  imports: [
    CommonModule,
    FeatureRoutingModule
  ]
})
export class FeatureModule { }