var isRectangleOverlap = function (rec1, rec2) {
  if (
    rec1[2] <= rec2[0] ||
    rec1[1] >= rec2[3] ||
    rec1[0] >= rec2[2] ||
    rec1[3] <= rec2[1]
  ) {
    return false;
  } else {
    return true;
  }
};