如何使用 JavaScript 实现单链表的增删改查操作？

/* 如何使用 JavaScript 实现单链表的增删改查操作？ */
// 单链表
function Node(element) {
  this.element = element;
  this.next = null;
}
function LList() {
  this.head = new Node('head');
  this.find = find;
  this.insert = insert;
  this.remove = remove;
  this.display = display;
  this.findPrevious = findPrevious;
}
function find(item) {
  var currNode = this.head;
  while (currNode.element !== item) {
    currNode = currNode.next;
  }
  return currNode;
}
function insert(newElement, item) {
  var newNode = new Node(newElement);
  var current = this.find(item);
  newNode.next = current.next;
  current.next = newNode;
}
function display() {
  var currNode = this.head;
  while (!(currNode.next === null)) {
    console.log(currNode.next.element);
    currNode = currNode.next;
  }
}
function findPrevious(item) {
  var currNode = this.head;
  while (!(currNode.next === null) && (currNode.next.element !== item)) {
    currNode = currNode.next;
  }
  return currNode;
}
function remove(item) {
  var prevNode = this.findPrevious(item);
  if (!(prevNode.next === null)) {
    prevNode.next = prevNode.next.next;
  }
}