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

// IEでも使える
document.querySelectorAll('selector').forEach(function(element) {
  element.addEventListener('click', function() { /* */});
});