How to show function javascript in libarary when use it

The question is quite unclear — please see my comment to it.

However, I hope my explanations on how to "show" any function can help you. Functions are first-class citizen in JavaScript, they are objects with all properties of all other objects, but of special "function" type. All objects can be dumped, represented as string. For example:
Create some function object:

var f = function() { return x + 1; }

Instead of calling it, you can show it:

alert(f);
// will show: function () { return x + 1; }

Why it works? Because the function object is implicitly represented as string. You can do it directly, too:

var s = f.toString(); // now s === "function () { return x + 1; }"

or even like this:

var s = '' + f;

I hope you got the idea.

—SA