AJAX_CPS.js

var get = function (path, callback) {
  var request = new XMLHttpRequest();
  request.onreadystatechange = function () {
    if (request.readyState == 4) {
      if (request.status === 200) {
        callback(JSON.parse(request.responseText));
      } else {
        console.error("Error", request.statusText);
      }
    }
  };
  request.open('GET', path);
  request.send();
};

console.time('get');
get('//jspromises.herokuapp.com/search/promises', function (response) {
  document.querySelector('.results').innerHTML = response.results[0].text;
  console.timeEnd('get');
});