Random Fact Web Service Call for the Chuck Norris App in HTML5

randomfact.js

function randomFact() {
  // We call the Web Service via AJAX
  var xmlhttp = new XMLHttpRequest();
  var url = "https://api.chucknorris.io/jokes/random";
  xmlhttp.onreadystatechange = function() {
    if (this.readyState == 4  &&  this.status == 200) {
      var json = JSON.parse(this.responseText);
      // We parse the JSON response
      parseJson(json);
    }		
  };

  xmlhttp.open("GET", url, true);
  xmlhttp.send();
}