IE에서 forEach 함수 사용 불가

if ('NodeList' in window && !NodeList.prototype.forEach) {
  console.info('polyfill for IE11');
  NodeList.prototype.forEach = function (callback, thisArg) {
    thisArg = thisArg || window;
    for (var i = 0; i < this.length; i++) {
      callback.call(thisArg, this[i], i, this);
    }
  };
}