title: setInterval and update data
body: <p>How i can update my API (get) with this function <code>setInterval()</code></p>
  
  <p>I have this this get func.: </p>
  
  <pre><code>getServices(){
      return this._http.get(this._url)
                      .map(res =&gt; res.json());
  }   
  </code></pre>
  
  <p>And i would to refresh my data (get json data) every 1 second</p>
  
  <p>I found this example, but this function only show logs every  one second, and how update my API with get?</p>
  
  <pre><code> setInterval(function (getServices) {
               console.log("Test")
           }, 1000)
  </code></pre>