Undefined in all parameters why?

Question

JavaScript

Again, because of my carelessness, I make mistakes somewhere, there is a code

<script type="text/javascript">
    VK.init({
        apiId: 5135424
    });
  function recommendate(){
    VK.Api.call('audio.getRecommendations', {}, function(r) {
      if(r.response) {
        $('#playlist').append('<li><a href="'+r.response.url+'"><b><'+r.response.artist+'></b> - '+r.response.title+'<span class="label"><'+r.response.aid+'></span></a></li>')       
      }
    });
  };
</script>

The response from VK has the following structure: VK.Api._callbacks[8402834]({"response":[{"aid":325739565,"owner_id":23303547,"artist":"Caspian Cargo, Guf","title":" All for $1 [New Rap] ","duration":298,"url":"http:\/\/cs9-4v4.vk.me\/p14\/........"," lyrics_id":"91370596","genre":18}
In all parameters that are displayed Undefined
And how to make it a cycle, otherwise only 1 record is displayed?

Answer 1

well, in the response array, so use itr.response[0].url

Answer 2

"response":[{}]
r.response contains an array of objects, and you are trying to work with it as if it were an object.