Angular のモジュールと遅延読み込みについて詳しく説明します

ng g module module/user

ng g component module/user

ng g component module/user/components/address
 ng g component module/user/components/order
 ng g component module/user/components/profile

<app-user></app-user>

ng g service module/user/services/common

user.module.ts

ng g module module/user --routing
 ng g module module/article --routing
 ng g module module/product --routing

ng g component module/user
ng g component module/user/components/profile
ng g component module/user/components/order

ng g component module/article
ng g component module/article/components/articlelist ng g component module/article/components/info

ng g component module/product
ng g component module/product/components/plist
ng g component module/product/components/pinfo

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

import { AppRoutingModule } from './app-routing.module';
...
imports: [
    AppRoutingModule,
]

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

    // import {ArticleComponent} from './article.component';
    const routes: Routes = [
    // {
    //     path:'',
    //     component:ArticleComponent
    // }
    ];

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

.....

import {ArticleComponent} from './article.component';
const routes: Routes = [
  {
    path:'',
    component:ArticleComponent
  }
];

......

const routes: Routes = [
  {
    path:'article',
    //写法一：
    loadChildren:'./module/article/article.module#ArticleModule'

    //写法二
    // loadChildren: () => import('./module/user/user.module').then( m => m.UserModule)  
  },
  // {
  //   path:'user',loadChildren:'./module/user/user.module#UserModule'
  // },
  // {
  //   path:'product',loadChildren:'./module/product/product.module#ProductModule'
  // },
  {
    path:'**',redirectTo:'article'
  }
];

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

import {ProductComponent} from './product.component';
const routes: Routes = [
  {
    path:'',
    component:ProductComponent
  }
];

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

import { ProductRoutingModule } from './product-routing.module';

imports: [
    ProductRoutingModule
  ],

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

import {UserComponent} from './user.component';
const routes: Routes = [
  {
    path:'',
    component:UserComponent
  }
];

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

import {UserRoutingModule} from './user-routing.module';  +

 imports: [
    UserRoutingModule   +
  ],

import { PlistComponent } from './components/plist/plist.component';
import { CartComponent } from './components/cart/cart.component';
import { PinfoComponent } from './components/pinfo/pinfo.component';

const routes: Routes = [
  {
    path:'',
    component:ProductComponent,
    children:[
      {path:'cart',component:CartComponent},
      {path:'pcontent',component:PinfoComponent}
    ]
  },
  {path:'plist',component:PlistComponent}
];

<router-outlet></router-outlet>

<a [routerLink]="[&#39;/product&#39;]">商品模块</a><a [routerLink]="[&#39;/product/plist&#39;]">商品列表</a>