SOURCE

// Node 类
function Node(element) {
  this.element = element;  //当前节点的元素
  this.next = null; // 下一个节点链接
}

// LinkedList 类
function LList() {
  this.head = new Node('head'); // 头节点
  this.find = find;
  this.insert = insert;
  this.remove = remove;
  this.findPrev = findPrev;
  this.display = display;
}

// 实现查找节点的方法
function find(item) {
  let currNode = this.head;
  while (currNode.element !== item) {
    currNode = currNode.next;
  }
  return currNode;
}

function insert(newElement, item ) {
  let newNode = new Node(newELement);
  let currNode = this.find(item);
  newNode.next = currNode.next;
  currNode.next = newNode;
}

var fruits = new LList();
fruits.insert = ('Apple', 'head');

console.log('fruits', fruits);