问Angular2 :对HTTP请求的响应正在IE中缓存

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@Injectable() 
class NoCacheHttp extends Http {
  constructor(_backend: ConnectionBackend, _defaultOptions: RequestOptions) {
    super(_backend, _defaultOptions);
  }

  get(url: string, options?: RequestOptionsArgs) : Observable<Response> {
    let newUrl = /* add some random or incrementing number query parameter to URL */
    return super.get(newUrl, options);
  }

  post(...)
  ...
}

@NgModule({
  imports: [HttpModule],
  export: [HttpModule],
  providers: [{provide: Http, useClass: NoCacheHttp}]
})
export class NoCacheHttpModule {}

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