YQL_CORS_Flickr.js

function toYQL(url) {
  var yqlUrl = 'http://query.yahooapis.com/v1/public/yql?q=',
       query = 'select * from json where url="{url}"'.replace('{url}', url);

  return yqlUrl + encodeURIComponent(query) + '&format=json';
}

function getCORSRequest(method, url) {
  
  return new Promise(function(resolve, reject) {
    var xhr = typeof XDomainRequest !== 'undefined' ? new XDomainRequest() : new XMLHttpRequest();

    xhr.open(method, url, true);
    xhr.onload = function() {
      resolve(JSON.parse(xhr.responseText));
    };

    xhr.onerror = reject;  
    xhr.send();
  }); 
}

var url = 'http://api.flickr.com/services/feeds/photos_public.gne?format=json&nojsoncallback=1';


getCORSRequest('GET', toYQL(url)).then(function(data) {
  success(data.query.results.json);
}).catch(function(err) {
  console.error(err); 
})

function success (data) {
   var results = document.querySelector('#results');
   data.items.forEach(function(item) {
     var el = document.createElement('div');
     el.innerHTML = item.description;
     
     results.appendChild(el);
   });
}