↗☻【+_+】url

Mr.doob
http://www.mrdoob.com/

PACMAN
http://www.andrew.cmu.edu/user/ziw/

学习编程 | Codecademy
http://www.codecademy.com/zh#!/exercises/0

RunJS - 在线编辑、展示、分享、交流你的 JavaScript 代码
http://runjs.cn/

Build, Explore, and Teach the Web, Instantly.
http://codepen.io/

Build Desktop Applications for Linux, Windows and Mac using HTML, CSS and Javascript
http://appjs.org/