Try JavaScript online

JavaScript.com is a resource built by the Code School team for the JavaScript community. It is now and will always be free. Because JavaScript is a great language for coding beginners, They have gathered some of the best free learning resources around and built a JavaScript course to help new developers get up and running.

With the help of community members contributing content to the site, JavaScript.com aims to also keep more advanced developers up to date on news, frameworks, and libraries.
javascript.com-online

For more information: JavaScript