function Voter(options) {
  var elem = options.elem;

  var voteElem = elem.querySelector('.vote');

  elem.onclick = function(event) {
    // сам обработчик не меняет голос, он вызывает функцию
    if (event.target.closest('.down')) {
      voteDecrease();
    } else if (event.target.closest('.up')) {
      voteIncrease();
    }
  }

  elem.onmousedown = function() {
    return false;
  };

  // ----------- методы -------------

  function voteDecrease() {
    setVote(+voteElem.innerHTML - 1);
  }

  function voteIncrease() {
    setVote(+voteElem.innerHTML + 1);
  }

  function setVote(vote) {
    voteElem.innerHTML = +vote;
    var widgetEvent = new CustomEvent("change", { bubbles: true, detail: +vote });
    elem.dispatchEvent(widgetEvent);
  };

  this.setVote = setVote;
}