The Treehouse site uses some of the concepts from Gamification to teach people web design/development and iOS/Android programming. In relation to gamification, you can earn badges as you complete courses, these are an indicator of what skills you currently possess and are viewable by anyone including recruiters.
Simply add return false; to OnClick as shown below:
<button onclick=’doTest();return false;’>Click me</button>
For $25, this guide walks you through the basics of jQuery
Some very cool jQuery plugins…definitely starting to challenge flash: