Function directionCheck

scripts/smoothScroll.js:711–722

(x, y)

    return el && (el.nodeName || "").toLowerCase() === tag.toLowerCase();
  }
  function directionCheck(x, y) {
    x = x > 0 ? 1 : -1;
    y = y > 0 ? 1 : -1;
    if (direction.x !== x || direction.y !== y) {
      direction.x = x;
      direction.y = y;
      que = [];
      lastScroll = 0;
      window.cancelAnimationFrame(pending);
      pending = null;
    }
  }
  function isTouchpad(deltaY) {
    if (!deltaY) return;
    if (!deltaBuffer.length) {