模块'AppModule'声明的异常值'undefined' [英] Unexpected value 'undefined' declared by the module 'AppModule'

问题描述

这是怎么了?我正在尝试使其正常运行，但在标题中出现该错误.我已经将<router-outlet></router-outlet>包括在app.component.html正在被app.component.ts调用的templateUrl中，仍然没有运气.

What is wrong here? I'm trying to make it work but I get that error in the header. I have included the <router-outlet></router-outlet> in the app.component.html that is being templateUrl called by the app.component.ts, still no luck.

app.module.ts :

import { NgModule }             from '@angular/core';
import { BrowserModule }        from '@angular/platform-browser';
import { FormsModule }          from '@angular/forms';
import { RouterModule, Routes } from '@angular/router';


import { AppComponent }  from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { TopnavComponent } from './components/navbars/topnav/topnav.component';
import { LeftnavComponent } from './components/navbars/leftnav/leftnav.component';
import { LeftnavsecondaryComponent } from './components/navbars/leftnav-secondary/leftnav-secondary.component';
import { WorldofwarcraftComponent } from './components/games/worldofwarcraft/worldofwarcraft.component';

@NgModule({
    imports:    [ BrowserModule, FormsModule, AppRoutingModule ],
    declarations:   [ AppComponent, TopnavComponent, LeftnavComponent, LeftnavsecondaryComponent, WorldofwarcraftComponent ],
    bootstrap:  [ AppComponent ]
})

export class AppModule { }

app-routing.module.ts :

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

import { WorldofwarcraftComponent } from './components/games/worldofwarcraft/worldofwarcraft.component';

const appRoutes: Routes = [
  { path: 'worldofwacraft', component: WorldofwarcraftComponent }
];

@NgModule({
  imports: [ RouterModule.forRoot(appRoutes) ],
  exports: [ RouterModule ]
})

export class AppRoutingModule {}

推荐答案

我遇到了相同的错误，有时会发生此问题，您只需要使用ng serve或使用的任何CLI重新运行服务器，如所提及的此处

I got the same error , sometimes this issue occur and you only need to re-run the server using ng serve or whatever CLI you use , as mentioned here

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