This is old LayaAir veriosn writetten by ActionScript 3.0 ,now LayaAir is using TypeScript as the Engine Script,Please use https://github.com/layabox/LayaAir instead.
LayaAir is an open-source 2D/3D engine. LayaAir Engine is designed for high performance games.LayaAir support TypeScript and JavaScript、ActionScript 3.0 programming language.Can develop once, publish for multi platform.