从角度为2的打字稿中的json响应对象中获取键/值对

 return this._http.post(apiUrl, model)
            .map((res: Response) => {
                console.log(res.json());
                let user = res.json();
               //let user = Object.keys(res.json());   <-- only gives keys not values

                if (user) {
                    localStorage.setItem('currentUser', JSON.stringify(user));
            }
        })
 return this._http.post(apiUrl, model)