游戏中常常需要用的寻找路径的需求，其中以a星算法为例，文件中的是A星寻路的主要的AS3.0的代码-Games often need to find the path of demand, of which a star algorithm example, the file is A star pathfinding code in the main AS3.0

A星寻路算法分析小程序，把游戏中的某个角色放在一个网格环境中，并给定一个目标点和一些障碍物，如何让角色快速“绕过障碍物”找出通往目标点的路径。-A Star pathfinding algorithm analysis procedures, a role in the game on a grid environment, and given a target point and a number of obstacles, how to identify the role quickly a