尝试扩展javascript函数时，如何避免过多的递归错误？

Question

I have a class in javascript with a property that is a function. When I try to redefine that function like this:

myObject.someBehavior = function()
{
  myObject.someBehavior();
  extraLogic();
};

I am getting a "Too much recursion error". I understand why I am getting this error, the myObject.someBehavior is holding a reference to the function, so changing the function does not change the reference. So my question is how can I avoid this?

To clarify, I am trying to extend a behavior function of a javascript object. IN C#, I would just override the method, calling the base class's version first. Not sure how to do this in javascript.

Answer 1

You could achieve this with closures . I'm not sure whether it's a good idea for what you're trying to do though. You might be better off learning how inheritance works in JS .

myObject.someBehavior = (function(oldFunction) {
    return function() {
        oldFunction();
        extraLogic();
    };
})(myObject.someBehavior);