SOURCE

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

class LinkedList {
    constructor() {
        this.listNode = new Node('head');
    }
    insert(nodeValue, ele) {
        const newNode = new Node(ele);
        let indexNode = this.listNode;
        while (nodeValue !== indexNode.value) {
            indexNode = indexNode.next;
        }
        newNode.next = indexNode.next;
        indexNode.next = newNode;
    }
    display() {
        let indexNode = this.listNode;
        while (indexNode) {
            indexNode = indexNode.next;
            console.log(indexNode)
        }
    }

}

var fruits = new LinkedList();
fruits.insert('head', 'Apple');
fruits.insert('Apple', 'Banana');
fruits.insert('Banana', 'Pear');
fruits.insert('Apple', '橘子');
console.log(fruits.display());       // Apple
                                     // Banana
                                     // Pear