添加{ provide: HTTP_INTERCEPTORS, useClass: HttpsInterceptorService, multi: true }到@NgModule.decorators的providers数组中解决。在HttpsInterceptorService中实现intercept方法。代码示例：

@Injectable() export class HttpsInterceptorService implements HttpInterceptor {

constructor(private auth: AuthService) {}

intercept( req: HttpRequest, next: HttpHandler ): Observable> { const newReq = req.clone({ headers: req.headers.set('Authorization', Bearer ${this.auth.getToken()}) }); return next.handle(newReq); } }

@NgModule({ imports: [HttpClientModule], providers: [ AuthService, { provide: HTTP_INTERCEPTORS, useClass: HttpsInterceptorService, multi: true } ] }) export class AppModule {}