How to subclass in JS

subclass.js

// Source: http://www.golimojo.com/etc/js-subclass.html

function subclass(constructor, superConstructor)
{
	function surrogateConstructor()
	{
	}

	surrogateConstructor.prototype = superConstructor.prototype;

	var prototypeObject = new surrogateConstructor();
	prototypeObject.constructor = constructor;

	constructor.prototype = prototypeObject;
}

function A (arg)
{
	this.arg = arg;
}

function B (arg)
{
	A.call(this, arg);

	this.print = function () {
		console.log(this.arg);
	};
}

subclass(B, A);