RequestGithub("menhui222").responseWK(WKGitHubUser).then ({ user in

        print(user.login)
    }).error { (err) in
        print(err)
    }

    let request1 = RequestGithub("menhui222").responseWK(WKGitHubUser)
    let request2 = RequestGithub("FengDeng").responseWK(WKGitHubUser)
     // 2个请求都成功 才返回
    when(request1,request2).then ({ (user1, user2)  in
        print(user1.login)
        print(user2.login)
    }).error { (error) in
        print(error)
            }

    //1成功 执行2
    self.requestGithub1().then ({ user -> Promise<WKGitHubUser> in
    
    return self.requestGithub2()
    
    }).then ({ user  in
        
    }).error { error in
        
    }
    
    感谢 PromiseKit ,Alamofire 提供开源框架0。0