connect-four game in javascript

I always wanted to created a connect4 (some call it connect-four) game in javascript. As always, performance are vital in the design of this game (for me at least). Its never about getting stuff to work, that is boring. It’s only about how to make stuff THE BEST you can. Quality if of the essence.

The game is only developed on the Client-side, and there is no server currently and no way for multiplayer. This is still an alpha version.

The Goal of the connect4 game is that either of the opponents reach a row, column or diagonal line which consists of 4 pieces.