移除链表中的元素

Remove all elements from a linked list of integers that have value val.

Example:

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Input:  1->2->6->3->4->5->6, val = 6
Output: 1->2->3->4->5
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const removeElements = function(head, val) {
  if (!head){
    return head;
  }
  while (head && head.val == val){
    head = head.next;
  }
  let current = head;
  while (current){
    if (current.next && current.next.val == val){
      current.next = current.next.next;
    }
    else{
      current = current.next;
    }
  }
  return head;
};