node.js - 错误: Unexpected value 'HttpClient' imported by the module 'AppModule' . 请添加@NgModule注解

Question

我不明白为什么会出现此错误:

Error: Unexpected value 'HttpClient' imported by the module 'AppModule'. Please add a @NgModule annotation.

我都试过了:

import { HttpClient } from '@angular/common/http';

和

import { HttpClientModule } from '@angular/common/http';

这是完整的错误:

Error: Unexpected value 'HttpClient' imported by the module 'AppModule'. Please add a @NgModule annotation.
at syntaxError (http://localhost:8100/build/vendor.js:116430:34)
at http://localhost:8100/build/vendor.js:131184:44
at Array.forEach (<anonymous>)
at CompileMetadataResolver.getNgModuleMetadata (http://localhost:8100/build/vendor.js:131159:49)
at JitCompiler._loadModules (http://localhost:8100/build/vendor.js:150357:87)
at JitCompiler._compileModuleAndComponents (http://localhost:8100/build/vendor.js:150318:36)
at JitCompiler.compileModuleAsync (http://localhost:8100/build/vendor.js:150212:37)
at CompilerImpl.compileModuleAsync (http://localhost:8100/build/vendor.js:115251:49)
at PlatformRef.bootstrapModule (http://localhost:8100/build/vendor.js:5952:25)
at Object.491 (http://localhost:8100/build/main.js:2405:109)

ionic 框架:3.9.2 Ionic Native:^2.9.0 Ionic 应用程序脚本:3.2.4 Angular 核心:5.2.11 Angular 编译器 CLI:5.2.11 Node :8.10.0 操作系统:Windows 10

Answer 1

您需要导入 HttpClientModule，例如:

 import { HttpClientModule } from '@angular/common/http';

 @NgModule({
   imports: [
     BrowserModule,
     // import HttpClientModule after BrowserModule.
     HttpClientModule,
  ],
  declarations: [
     AppComponent,
  ],
  bootstrap: [ AppComponent ]
})

export class AppModule {}

阅读:Angula HttpClient