Edit in JSFiddle

var $requestUrlExample = "https://cors-anywhere.herokuapp.com/http://jsfiddle.net/api/user/ourcodeworld/demo/list.json";
var $requestUrlTwo = "https://cors-anywhere.herokuapp.com/http://jsfiddle.net/api/user/ourcodeworld/demo/list.json?start=1&limit=1";
var $requestUrlThree = "https://cors-anywhere.herokuapp.com/https://api.github.com/repos/sdkcarlos/artyom.js";

$("#trigger").click(function(){
	$('#loading').text("Executing ...");
  $.when($.getJSON($requestUrlExample),
       $.getJSON($requestUrlTwo),
       $.getJSON($requestUrlThree))
  .then(function (resp1,resp2,resp3) {
  	$('#loading').text("Ready !");
    // Handle results
    // The request reponse will be retrieven respectively of the given order
    console.log(resp1);$("#ct-resp1").text(JSON.stringify(resp1[0]));
    console.log(resp2);$("#ct-resp1").text(JSON.stringify(resp2[0]));
    console.log(resp3);$("#ct-resp1").text(JSON.stringify(resp3[0]));
  }).fail(function (problem) {
      // handle errors (some request has failed)
      console.log(problem);
  });
});

<p>
The following example shows how to execute many ajax request at time and retrieve all the responses in only 1 callback.
Open the console for more information.
</p>
<input type="button" id="trigger" value="Execute 3 requests and retrieve content with only 1 callback"/><br>
<span id="loading"></span><br>
<span id="ct-resp1"></span><br>
<span id="ct-resp2"></span><br>
<span id="ct-resp3"></span><br>