code: function addEventListener (event, listener) {
      if (hasDOM()) {
        eventEmitter.addEventListener(event, listener);
      } else if (hasEventEmitter()) {
        eventEmitter.on(event, listener);
      }
    }
docs: [addEventListener Adds event listener to the timer]
  @param {string} event      [event to listen]
  @param {function} listener   [the event listener function]