Angular 6：将急切加载转换为延迟加载

Question

我有一个完整的角度应用程序，它使用急切加载。我想将其转换为延迟加载，但是因为我对所有路线都有保护，并且所有路线都是受保护的一条主路线的子路线，所以我不知道是否可以做到这一点并仍然使其发挥作用就像急切加载一样。

这是我在 app-routing.module 中的路由数组：

// Routing array - set routes to each html page
const appRoutes: Routes = [
  { path: 'login/:id', canActivate: [AuthGuard], children: [] },
  { path: '', canActivateChild: [AuthGuard], children: [
    { path: '', redirectTo: '/courses', pathMatch: 'full' },
    { path: 'courses', component: CourseListComponent,  pathMatch: 'full'},
    { path: 'courses/:courseId', component: CourseDetailComponent, pathMatch: 'full' },
    { path: 'courses/:courseId/unit/:unitId', component: CoursePlayComponent,
      children: [
        { path: '', component: CourseListComponent },
        { path: 'lesson/:lessonId', component: CourseLessonComponent, data:{ type: 'lesson'} },
        { path: 'quiz/:quizId', component: CourseQuizComponent, data: {type: 'quiz'} }
      ]}
    ]},
  { path: 'welcome', component: LandingPageComponent, pathMatch: 'full' },
  { path: '**', component: PageNotFoundComponent, pathMatch: 'full' }];

我想知道的是是否可以通过延迟加载来实现这一点，如果可以的话，我想知道主要思想或我需要知道什么才能做到这一点。

在我做的所有教程中我从未遇到过这种事情。非常感谢

Answer 1

谢谢大家的回答。我成功地将路由转换为延迟加载。这是代码：

应用程序路由模块

import { NgModule } from '@angular/core';
import { Routes, RouterModule, Router } from '@angular/router';
import { AuthGuard } from './auth.guard';

import { AppComponent } from './app.component';
import { PageNotFoundComponent } from './page-not-found/page-not-found.component';
import { LandingPageComponent } from './landing-page/landing-page.component';
import { HeaderComponent } from './header/header.component';
import { CourseModule } from './courses/course.module';


const routes:Routes = [
  { path: 'welcome', component: LandingPageComponent, pathMatch: 'full' },
  { path: 'login/:id', canActivate: [AuthGuard],  children: [] },
  { path: '', canActivateChild: [AuthGuard], children: [
    { path: '', redirectTo: 'courses', pathMatch: 'full' },
    { path: 'courses',  loadChildren: () => CourseModule }
  ]},
  { path: '**', component: PageNotFoundComponent, pathMatch: 'full' }
]

@NgModule({
  imports: [RouterModule.forRoot(routes, { onSameUrlNavigation: 'reload', initialNavigation: 'enabled',
      paramsInheritanceStrategy: 'always' })],
  providers: [AuthGuard],
  exports: [RouterModule]
})


export class AppRoutingModule {  }

课程路由模块

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from "@angular/router";
import { AuthGuard } from '../auth.guard';

import { CourseListComponent } from './course-list/course-list.component';
import { CourseDetailComponent } from './course-detail/course-detail.component';
import { CoursePlayComponent } from './course-play/course-play.component';
import { CourseQuizComponent } from './course-play/course-quiz/course-quiz.component';
import { CourseLessonComponent } from './course-play/course-lesson/course-lesson.component';


const routes:Routes = [
  { path: '', component: CourseListComponent, canActivate: [AuthGuard] },
  { path: ':courseId', component: CourseDetailComponent, canActivate: [AuthGuard] },
  { path: ':courseId/unit/:unitId', component: CoursePlayComponent, canActivate: [AuthGuard], canActivateChild: [AuthGuard], children: [
    { path: 'lesson/:lessonId', component: CourseLessonComponent, data:{ type: 'lesson'} },
    { path: 'quiz/:quizId', component: CourseQuizComponent, data: {type: 'quiz'}}
  ]}
]

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

授权卫士

import { Injectable } from '@angular/core';
import { Observable, throwError } from 'rxjs';
import { Router, CanActivate, CanActivateChild, CanLoad, ActivatedRouteSnapshot, RouterStateSnapshot, NavigationExtras, Route } from '@angular/router';
import { AuthUserService } from './users/auth-user.service';
import { LocalStorage } from '@ngx-pwa/local-storage';

@Injectable()
export class AuthGuard implements CanActivate , CanActivateChild {

    constructor(private authUserService: AuthUserService, private router: Router) {   }

    canActivate(route: ActivatedRouteSnapshot, state:
       RouterStateSnapshot): boolean |
       Observable<boolean> | Promise<boolean> {
         let id, course_id;

         // save the id from route snapshot
         if (route.params) {
           id = +route.params.id;
           course_id = +route.params.courseId;
         }

         // if you try to logging with id
         if (id) {
           this.router.navigate(["/courses"]);
           return this.authUserService.login(id);
         }

         // if you're already logged in and navigate between pages
         if (this.authUserService.isLoggedIn()){
           if (course_id){
             // check if someone try to access a locked course
             if (this.authUserService.isCourseNotPartOfTheSubscription(course_id)){
               this.router.navigate(["/welcome"]);
               return false;
             }
             else
               return true;
           }
           else
             return true;
         }

         // if you are not logged and didn't try to log - redirect to landing page
         else {
           this.router.navigate(["/welcome"]);
           return false;
         }
        }

      canActivateChild(route: ActivatedRouteSnapshot,state: RouterStateSnapshot): boolean |
      Observable<boolean> | Promise<boolean> {
         return this.canActivate(route, state);
       }

       canLoad(route: ActivatedRouteSnapshot,state: RouterStateSnapshot): boolean |
       Observable<boolean> | Promise<boolean> {
         return this.canActivate(route, state);
       }
}