Typescript 如何在ionic中从服务器获取数据

在爱奥尼亚的地狱里，我已经走出了我的深渊。下面是我当前的代码，它返回一个可观察的。我需要它从服务器返回响应（出于分离关注点的目的，它位于单独的文件中）

auth.ts

import { Http } from '@angular/http';
import 'rxjs/add/operator/map';

export const getToken = function(http){
    let response = http.post('localhost:3000/auth/authenticate', 
                {email: 'mendelh1537@gmail.com', password: 'password'}).then();
    return response();
}

export const getToken = function(http){
    return http.post('localhost:3000/auth/authenticate', 
                {email: 'mendelh1537@gmail.com', password: 'password'});
}

home.ts

constructor(public events: Events, public http: Http,
    ...

smsPressed(item){
    console.log(getToken(this.http));
}

constructor(public events: Events, public http: Http,
    ...

smsPressed(item){
    getToken(this.http).subscribe(token => {
         console.log(token);   
    })
}

错误

---

Http.post

不返回

Promise

它返回

可观察的

auth.ts

import { Http } from '@angular/http';
import 'rxjs/add/operator/map';

export const getToken = function(http){
    let response = http.post('localhost:3000/auth/authenticate', 
                {email: 'mendelh1537@gmail.com', password: 'password'}).then();
    return response();
}

export const getToken = function(http){
    return http.post('localhost:3000/auth/authenticate', 
                {email: 'mendelh1537@gmail.com', password: 'password'});
}

home.ts

constructor(public events: Events, public http: Http,
    ...

smsPressed(item){
    console.log(getToken(this.http));
}

constructor(public events: Events, public http: Http,
    ...

smsPressed(item){
    getToken(this.http).subscribe(token => {
         console.log(token);   
    })
}