如何从angular2中的可观察数据中获取数据 [英] How to get data from observable in angular2

问题描述

我正在尝试使用rxjs

考虑以下代码

import { Component, Injectable, OnInit } from '@angular/core';
import { Http, HTTP_PROVIDERS } from '@angular/http';
import 'rxjs/Rx';

@Injectable()
class myHTTPService {
  constructor(private http: Http) {}

  configEndPoint: string = '/my_url/get_config';

  getConfig() {

    return this.http
      .get(this.configEndPoint)
      .map(res => res.json());
  }
}

@Component({
    selector: 'my-app',
    templateUrl: './myTemplate',
    providers: [HTTP_PROVIDERS, myHTTPService],


})
export class AppComponent implements OnInit {

    constructor(private myService: myHTTPService) { }

    ngOnInit() {
      console.log(this.myService.getConfig());
    }
}

每当我尝试打印出getconfig的结果时，它总是返回

Whenever I tried to print out the result of getconfig it always return

Observable {_isScalar: false, source: Observable, operator: MapOperator}

即使我返回一个json对象.

even though I return a json object instead.

我如何打印getConfig的结果?

推荐答案

您需要订阅可观察对象，并传递一个处理发出的值的回调

You need to subscribe to the observable and pass a callback that processes emitted values

this.myService.getConfig().subscribe(val => console.log(val));

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