js中insert如何插入节点

insert (position, element) {

    // position不能超出边界值

    if (position < 0 || position > this.length) return false;

    let node = new Node(element);

    if (position === 0) {

        node.next = this.head;

        this.head = node;

    }else {

        let previous = this.find(position - 1);

        node.next = previous.next;

        previous.next = node;

    }

    //将节点挂到链表上之后，需要将链表的长度加1

    this.length++;

    return true;

}