//方案1：能用，但token信息不能寫在服務中，應該用全局變量替代，而且還得考慮參數復合問題。
@Injectable()
export class DefaultRequestOptions extends BaseRequestOptions {
  constructor() {
  super();
  this.headers.set('Content-Type', 'application/json');
 }
}
export const requestOptionProvider = {provide: RequestOptions, useClass: DefaultRequestOptions};
//方案2:能用，比較正規的實現，但以后請求就只能用myHttp對象了，而且還要考慮參數復合問題。
export class myHttp extends Http {
 defaultHeaders = new Headers({
  'Content-Type': 'application/json'
 });

 constructor(_backend: ConnectionBackend, _defaultOptions: RequestOptions, private appInitService: AppInitService) {
  super(_backend, _defaultOptions);
 }

 get(url: string, options?: RequestOptionsArgs): Observable<Response> {
  let optionBuf = new RequestOptions({
   headers: this.defaultHeaders,
   params: {'token': this.appInitService.token}
  });
  //here extend options;
  return super.get(url, optionBuf);
 }
}

export function myHttpFactory(xhrBackend: XHRBackend, requestOptions: RequestOptions, appInitService: AppInitService): myHttp {
 return new myHttp(xhrBackend, requestOptions, appInitService); // 創建myHttp對象
}

export const myHttpProvider = {
 provide: myHttp,
 useFactory: myHttpFactory,
 deps: [XHRBackend, RequestOptions, AppInitService]
};