JS_CallFunctionName can call a method of an object by name:

JSObject* obj;
JS_CallFunctionName(cx, obj, "doSomething", argc, vp, retVal);

The code above works fine if the "doSomething" is a function declared in the prototype of the "obj".

What I want to know is if there is a way to call a function that is a "class function".

I tried:

if(JS_HasProperty(getGlobalContext(), getGlobalObject(), "ClassToGet", &b)) {
    print("OK");
}

and the output is "OK".

But when tried:

JS_GetProperty(getGlobalContext(), getGlobalObject(), "ClassToGet", &jsOwner);
if (jsOwner != JSVAL_VOID) {
}

the jsOwner is a JSVAL_VOID.

Maybe there is a function in SpiderMonkey can execute function in a JSClass ?

Any suggestion will be appreciated, thanks :)