Function removeEvent

scripts/smoothScroll.js:705–707

(type, fn, arg)

    window.addEventListener(type, fn, arg || false);
  }
  function removeEvent(type, fn, arg) {
    window.removeEventListener(type, fn, arg || false);
  }
  function isNodeName(el, tag) {
    return el && (el.nodeName || "").toLowerCase() === tag.toLowerCase();
  }