Learning Java Resources

Javascript (JS) is a scripting language executed by internet browsers. Storyline (SL) creates HTML files that browsers use to display web pages. So anything in JS applies to SL, it's just a question of defining what you want in a specific story.  Unless you become a professional web designer, it is unlikely you will need to learn great portions of JS. The most likely course of action is to consider it a hobby, and play around with it as much as you want. Then when you have a specific need look up how to do it. Find something close and adapt it. W3schools is one resource, and as Belkin suggests, Zolt's resource is excellent.