If you want to learn to create relatively simple online games using Javascript, then the HTML5 Game From Scratch Step By Step Learning JavaScript course is a great place to start.

Though Game Builder does allow you to "live-code" your game using JavaScript if you have the knowledge to do so, it's been designed with the average user in mind.

With HTML5, CSS and JavaScript, you can build some pretty nice little games — and without a significant up-front investment. If you’re comfortable with just these technologies, you’re pretty ...

You'll start by learning HTML5 Canvas and creating Canvas-based games like Pong, Catcher, Bubble Popper, and more. It's an easy way to absorb everything you need to know, while having some fun ...