angular - BrowserModule 已经加载

Question

这是我的代码:

 import { CommonModule } from '@angular/common';
    import { HttpClientModule } from '@angular/common/http';
    import { NgModule } from '@angular/core';
    import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
    import { LanguageTranslationModule } from './shared/modules/language-translation/language-translation.module'

    import { AppRoutingModule } from './app-routing.module';
    import { AppComponent } from './app.component';
    import { AuthGuard } from './shared';

    import { SidebarComponent } from './layout/components/sidebar/sidebar.component';
    import { HeaderComponent } from './layout/components/header/header.component';

    @NgModule({
        imports: [
            CommonModule,
            BrowserAnimationsModule,
            HttpClientModule,
            LanguageTranslationModule,
            AppRoutingModule

        ],
        declarations: [AppComponent,HeaderComponent,SidebarComponent],
        providers: [AuthGuard],
        bootstrap: [AppComponent],
        exports: [
            HeaderComponent,
            SidebarComponent
      ],

    })
    export class AppModule {}

我不知道为什么我会得到这个异常(exception):

Error: BrowserModule has already been loaded. If you need access to common directives such as NgIf and NgFor from a lazy loaded module, import CommonModule instead. Error: BrowserModule has already been loaded. If you need access to common directives such as NgIf and NgFor from a lazy loaded module, import

在 future 的模块中，我导入 CommonModule而不是 BrowerModule .任何人都可以帮助我吗？

Answer 1

进口 BrowserAnimationsModule和 HttpModule仅一次(在您的根模块或核心模块中)。

仅将这些提到的模块导入一次(仅在 app-module 中):
BrowserModule , BrowserAnimationsModule , LazyLoadImageModule (如果使用)，CarouselModule (如果使用)，InfiniteScrollModule (如果使用)，HttpModule (如果使用它)