What way is better?

prototype.js

function boo(){
	this.someShit = true;
}
//this is how im doing my prototype for each method
boo.prototype.too = function(val){
	this.moreShit = false;
}

boo.prototype.uoo = function(val){
	this.evenMoreShit = true;
}

//or should i do it like this
boo.prototype = (function(){
	//some private shit
	return {
		uoo: function(val){
			this.evenMoreShit = true;
		},
		too: function(val){
			this.moreShit = false;
		}
	}
	
})();
//or should i do it like this
boo.prototype = {
	uoo: function(val){
		this.evenMoreShit = true;
	},
	too: function(val){
		this.moreShit = false;
	}
};

var ohMy = new boo()