Inject custom code to object's methods. #JavaScript FYI: not working correctly!

player.js

function Player(id, name) {
	this.id   = id;
	this.name = name;
	this.hp   = 100;
	return this;
}

Player.prototype.attack = function(type)
{
	gameLogic.attack(this, type);
};

Player.prototype.wound = function(amount)
{
	this.hp -= amount
};

/**
 * Override player object's methods with custom trigger or whatever
 * Player.attack() will trigger a 'player.attack' event
 */
for (var methodName in Player.prototype) {					// override all prototype method
	if (methodName !== 'contructor') {					// don't need that
		var legacyMethod = Player.prototype[methodName];		// save original function for later use
		Player.prototype[methodName] = function()
		{
			// TODO execute code before original method called
			var result      = legacyMethod.apply(this, arguments);	// call the original method
			// TODO execute code after orifinal method called
			var eventName   = 'player.' + methodName;
			var eventParams = {params: arguments, result: result};	// pass some information to callback
			$('body').trigger(eventName, eventParams);		// TODO replace or do more stuff here
			return result;						// return the original response
		};
	}
}