如何在TypeScript中扩展类?
发布时间:2020-12-17 07:30:46 所属栏目:安全 来源:网络整理
导读:我有几个服务,里面有相同的代码: constructor (private http: Http) { //use XHR object let _build = (any http)._backend._browserXHR.build; (any http)._backend._browserXHR.build = () = { let _xhr = _build(); _xhr.withCredentials = true; return
我有几个服务,里面有相同的代码:
constructor (private http: Http) { //use XHR object let _build = (<any> http)._backend._browserXHR.build; (<any> http)._backend._browserXHR.build = () => { let _xhr = _build(); _xhr.withCredentials = true; return _xhr; }; } 我想将代码移到单独的文件http_base_clas.ts并尽可能地重用代码.这里是http_base_clas.ts: import {Http} from '@angular/http'; export class HttpBaseClass { constructor ( http: Http) { //use XHR object let _build = (<any> http)._backend._browserXHR.build; (<any> http)._backend._browserXHR.build = () => { let _xhr = _build(); _xhr.withCredentials = true; return _xhr; }; } } 如何将http_base_class扩展为auth_service.ts? import {Injectable} from '@angular/core'; import {Http,Response} from '@angular/http'; import {Headers,RequestOptions} from '@angular/http'; import {Observable} from 'rxjs/Observable'; @Injectable () export class AuthenticationService { result: { ok: boolean; }; private verifyUrl = 'http:example.com; constructor (private http: Http) { } private authRequest (url) { let body = JSON.stringify({}); let headers = new Headers({ 'Content-Type': 'application/json'}); let options = new RequestOptions({ headers: headers }); return this.http.post(url,body,options) .map((res: Response) => res.json()) .map(res => { this.result = res; return this.result.ok; }); } } class AuthenticationService extends HttpBaseClass { constructor(http:Http) { super(http); } private authRequest (url) { ... } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |