BM15 删除有序链表中重复的元素-I

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/*  * function ListNode(x){  *   this.val = x;  *   this.next = null;  * }  */   /**   *   * @param head ListNode类   * @return ListNode类   */ function deleteDuplicates( head ) {     // write code here     if(head == null){         return null     }           if(head.next == null) {         return head     }           if(head.next.next == null && head.val == head.next.val){         return head.next     }               let p = head     while(p.next !== null) {         if(p.val == p.next.val) {             p.next = p.next.next         }else {             p = p.next         }                }          return head } module.exports = {     deleteDuplicates : deleteDuplicates };