A*算法，A*（A-Star)算法是一种静态路网中求解最短路径最有效的直接搜索方法，也是解决许多搜索问题的有效算法。算法中的距离估算值与实际值越接近，最终搜索速度越快。(A* algorithm and A* (A-Star) algorithm are the most effective direct search methods for solving the shortest path in static road network, and also are effective algo