在 Angular 4.0.0 中注入 Http

Question

当我尝试在引导应用程序模块之前调用 ajax 请求时。我得到了。

  let injector = ReflectiveInjector.resolveAndCreate([
        Http,
        BrowserXhr,
        {provide: RequestOptions, useClass: BaseRequestOptions},
        {provide: ResponseOptions, useClass: BaseResponseOptions},
        {provide: ConnectionBackend, useClass: XHRBackend}
      ]);
      this._http = injector.get(Http);

Answer 1

您需要将 HttpModule 注册到您的应用程序。 从'@angular/http'导入{ HttpModule}；

@NgModule({
  imports: [
    HttpModule
  ],
  declarations: [AppComponent],
  bootstrap:    [AppComponent]
})
export class AppModule {
}