There's nothing wrong with sticking with JavaScript.

But to be fair, JavaScript doesn't do it without help from others! A nice overview at JavaScript Graphics shows many alternatives, but in the end they all rely on capabilities provided by the browser.

You can run Perl in a browser (the author of that thing is a regular writer here, too). You also can write a standalone program, but as the Perl core has no graphics features, you indeed need libraries (e.g. from CPAN) to take over that part. If I am not mistaken, you need extra libraries, too, if run your JavaScript game on e.g. Node.js instead of a browser.