JS Mixin

gistfile1.js

var RoundButton = function(radius, label, action) {
    this.radius = radius;
    this.label = label;
    this.action = action;

	this.StuffSp = 'hoho';
};

var someStuff = function(){
	if(this.hasOwnProperty('StuffSpace')){
	throw "not good!!";
	return;
	}

	this.StuffSpace = {
		ballz: function(){ console.log('baller!'); }

		}
	}

//mixin this stuff!
someStuff.call(RoundButton.prototype);