angular2实现统一的http请求头方法

 //方案1：能用，但token信息不能写在服务中，应该用全局变量替代，而且还得考虑参数复合问题。 @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，比较正规的实现，但以后请求就只能用myHttp对象了，而且还要考虑参数复合问题。 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 { 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); // 创建myHttp对象 } export const myHttpProvider = { provide: myHttp, useFactory: myHttpFactory, deps: [XHRBackend, RequestOptions, AppInitService] };