how can I override the update of CCAction in js

cocos2d-x JavaScript
#1

Hi,everyone

I wanna create a new action in js, here is my code

cc.Action.extend = cc.Class.extend;

var MyAction = cc.Action.extend({
   update : function(){  cc.log("my action update"); }
});
...
spr.runAction(MyAction.create());

but i can’t override the update method, it will print the log “[Action update]. override me” continuously .

is it must be implemented in cpp for register to js?

#2

I subscribe to this question!