RouterModule.forRoot()调用了两次。延迟加载的模块应该使用RouterModule.forChild()代替

Question

我正在延迟加载模块中导入AppModule，该模块正在创建错误: Error: Uncaught (为了承诺)：Error: RouterModule.forRoot()调用了两次。延迟加载的模块应该使用RouterModule.forChild()代替。

应用程序模块

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { NgClockPickerLibModule } from 'ng-clock-picker-lib';
import { SharedDataService } from './services/shared-data.service';


@NgModule({
  declarations: [
    AppComponent,
    ...
  ],
  imports: [
    BrowserModule,  
    NgClockPickerLibModule,
    ...
  ],
  providers: [
    SharedDataService,
    ...
  ],
  exports: [
    NgClockPickerLibModule
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

应用程序路由模块

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

const routes: Routes = [
  { path: 'journalling', loadChildren: './Journalling/modules/journalling.module#JournallingModule' }
];

@NgModule({
  imports: [
    CommonModule,
    RouterModule.forRoot(routes)
  ],
  declarations: [

  ],
  exports: [RouterModule]
})
export class AppRoutingModule { }

日志模块

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { JournallingRoutingModule } from './journalling-routing.module';
import { AppModule } from 'src/app/app.module';


@NgModule({
  imports: [
    CommonModule,
    JournallingRoutingModule,
    AppModule
  ],
  declarations: [ 
  ],
  providers: [
  ]
})
export class JournallingModule { }

日志路由模块

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

const routes: Routes = [  
];

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

错误RouterModule.forRoot()调用了两次。延迟加载的模块应该使用forChild()代替。1：https://i.stack.imgur.com/yMDry.png

Answer 1

日志模块

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { JournallingRoutingModule } from './journalling-routing.module';
import { AppModule } from 'src/app/app.module'; <--- remove this import

@NgModule({
  imports: [
    CommonModule,
    JournallingRoutingModule,
    AppModule // <--- remove this import
  ],
  declarations: [ 
  ],
  providers: [
  ]
})
export class JournallingModule { }

问题是您在JournallingModule中导入了RouterModule.forRoot()，这导致RouterModule.forRoot()被调用了两次。AppModule是根模块，不应该导入子模块。