Es6 Ajax request

es6-ajax-request.js

export default class Ajax {
  get(url, callback) {
    let xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');
    xhr.open('GET', url);
    xhr.onreadystatechange = () => {
      if (xhr.readyState > 3 && xhr.status === 200) {
          callback(xhr.responseText);
      }
    };
    xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
    xhr.send();

    return xhr;
  }

  post(url, data, callback) {
    let params = typeof data == 'string' ? data : Object.keys(data).map((k) => {
      return encodeURIComponent(k) + '=' + encodeURIComponent(data[k]);
    }).join('&');

    let xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
    xhr.open('POST', url);
    xhr.onreadystatechange = function() {
      if (xhr.readyState > 3 && xhr.status === 200) {
        callback(xhr.responseText);
      }
    };
    xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xhr.send(params);

    return xhr;
  }
}