How to list the functions/methods of a javascript object? (Is it even possible?)

问题

This question is intentionally phrased like this question.

I don't even know if this is possible, I remember vaguely hearing something about some properties not enumerable in JS.

Anyway, to cut a long story short: I'm developing something on a js framework for which I have no documentation and no easy access to the code, and it would greatly help to know what I can do with my objects.

回答1:

I think this is what you are looking for:

var obj = { locaMethod: function() { alert("hello"); }, a: "b", c: 2 };
for(var p in obj)
{
    if(typeof obj[p] === "function") {
      // its a function if you get here
    }
}

回答2:

If you include Underscore.js in your project, you can use _.functions(yourObject).

回答3:

You should be able to enumerate methods that are set directly on an object, e.g.:

var obj = { locaMethod: function() { alert("hello"); } };

But most methods will belong to the object's prototype, like so:

var Obj = function ObjClass() {};
Obj.prototype.inheritedMethod = function() { alert("hello"); };
var obj = new Obj();

So in that case you could discover the inherited methods by enumerating the properties of Obj.prototype.

回答4:

You can use the following:

var obj = { locaMethod: function() { alert("hello"); }, a: "b", c: 2 };


for(var p in obj)
{
    console.log(p + ": " + obj[p]); //if you have installed Firebug.
}

来源：https://stackoverflow.com/questions/4352997/how-to-list-the-functions-methods-of-a-javascript-object-is-it-even-possible