Linked list in Javascript

gistfile1.js

function node(data, next) {
	this.data = data;
	this.next = next;
}

function linkedlist() {
	this.first = null;
}

linkedlist.prototype.insertNode = function(data) {

	if(this.first == null) {
		this.first = new node(data, null);
	} else {
		this.first = new node(data, this.first);
	}
}

// print content of linkedlist in console.log
linkedlist.prototype.printlist = function() {

	var temp = this.first;
	while(temp != null) {
		console.log(temp.data);
		temp = temp.next;			// switch temp to next node
	}
}

linkedlist.prototype.reverse = function() {

	var temp;
	var previous = null;

	while(this.first != null) {

		temp = this.first.next;
		this.first.next = previous;
		previous = this.first;
		this.first = temp;
	}

	this.first = previous;	
}


// test it
var list = new linkedlist();
list.insertNode("lol");
list.insertNode("hey");
list.insertNode("sup");
list.insertNode("whahhta");

list.printlist();     // prints to console.log