Do we support box2d with jsb now ? Do people know it?
Actually no at the present, I choosed Chipmunk to use on botth web and native platform. You can try it 
thanks~
Actually for this reason, I made one game with chipmunk. Niw it seems it will continue.
have u ever used Poligon shapes in your game. It seem to be imposible for me to make Poligon shapes in my game 
but it worked well with Circle or rectangle shapes