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.

For only $15, the Complete Web Developer Course will fill you in on the fundamentals of HTML, CSS, and JavaScript and guide you through building 20 real-world websites from scratch.

BlockLike.js is an educational JavaScript library that attempts to extend the block-based Scratch learning experience to JavaScript text-based programming.

Microsoft's JavaScript and Node.js series builds on the free beginner Python classes it released last year and followed up with more tutorials this May.