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.

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 ...

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.

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 ...