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83.删除排序链表中的重复元素

给定一个已排序的链表的头  head ,  删除所有重复的元素,使每个元素只出现一次  。返回 已排序的链表  。

示例 1:
输入:head = [1,1,2]
输出:[1,2]

示例 2:
输入:head = [1,1,2,3,3]
输出:[1,2,3]

提示:
链表中节点数目在范围 [0, 300] 内
-100 <= Node.val <= 100
题目数据保证链表已经按升序 排列

javascript
/**
 * Definition for singly-linked list.
 * function ListNode(val, next) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.next = (next===undefined ? null : next)
 * }
 */
/**
 * @param {ListNode} head
 * @return {ListNode}
 */
var deleteDuplicates = function (head) {
  var cur = head
  while (cur && cur.next) {
    if (cur.next.val === cur.val) {
      cur.next = cur.next.next
    } else {
      cur = cur.next
    }
  }
  return head
}

// test

function ListNode(val, next) {
  this.val = val === undefined ? 0 : val
  this.next = next === undefined ? null : next
}

var n1 = new ListNode(1)
var n2 = new ListNode(1)
var n3 = new ListNode(2)
n1.next = n2
n2.next = n3

console.log(deleteDuplicates(n1))