在JavaScript中，Set如何与Get in Singly Linked List一起使用？

class ListNode {
  constructor(value) {
    this.value = value;
    this.next = null;
  }
}

class LinkedList {
  constructor() {
    this.head = null;
    this.tail = null;
  }

  // 添加节点
  addNode(value) {
    const newNode = new ListNode(value);
    if (!this.head) {
      this.head = newNode;
      this.tail = newNode;
    } else {
      this.tail.next = newNode;
      this.tail = newNode;
    }
  }

  // 获取节点
  getNode(index) {
    let currentNode = this.head;
    let currentIndex = 0;

    while (currentNode) {
      if (currentIndex === index) {
        return currentNode.value;
      }
      currentNode = currentNode.next;
      currentIndex++;
    }

    return null;
  }
}

const linkedList = new LinkedList();

// 添加节点
linkedList.addNode(1);
linkedList.addNode(2);
linkedList.addNode(3);

// 获取节点
console.log(linkedList.getNode(0)); // 输出: 1
console.log(linkedList.getNode(1)); // 输出: 2
console.log(linkedList.getNode(2)); // 输出: 3