我认为您缺少提供商中的括号，例如

I think you are missing a bracket in your providers, like below

providers: [
    [ { provide: HTTP_INTERCEPTORS, useClass: SimpleInterceptor, multi: true }, ]
  ]

如果上述方法不起作用，您可以查看如何在 Angular HttpClient指南

If the above does not work, you can review how to setup an interceptor in the Angular HttpClient Guide