#203. 移除链表元素

var removeElements = function (head, val) {
  let dummy = new ListNode(0, head);
  let cur = dummy;
  while (cur.next !== null) {
    if (cur.next.val === val) {
      cur.next = cur.next.next;
      continue;
    }
    cur = cur.next;
  }
  return dummy.next;
};