promise-xhr.js

// Promesas (Promises) ES6
// XHR request XMLHttpRequest
// cross domain request
// https://www.mocky.io/


function request(url){
  return new Promise((resolve, reject) => {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url);
    xhr.onload = () => {
      if (xhr.status === 200) {
        resolve(xhr.responseText);
      } else {
        reject(xhr.responseText);
      }
    };
    xhr.send();
  });
}

request('https://www.mocky.io/v2/5c6b866f3200007609bef489')
  .then((data) => {
    var parsed = JSON.parse(data);
    console.log(parsed);
  })
  .catch(() => {
    console.log('failure');
  });


request('https://www.mocky.io/v2/5c6b877a320000e40abef490')
  .then((data) => {
    var parsed = JSON.parse(data);
    console.log(parsed);
  })
  .catch((data) => {
    var parsed = JSON.parse(data);
    console.log('failure', parsed);
  });