Is it possible to get all of the arguments a Javascript function is written to accept? (I know that all Javascript function arguments are optional)? If not, is it possible to get the number of arguments? For example, in PHP, one could use:

$class = new ReflectionClass('classNameHere');

$methods = $class->getMethods();

foreach ($methods as $method) {

    print_r($method->getParameters());

}

... or something like that, I haven't touched PHP in a while so the example above may not be correct.

Thanks in advance!

EDIT: Unfortunately, I have to be able to get the arguments outside of the body of the function... Sorry for the lack of clarification, but thanks for the current answers!