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 algorithms to solve many search problems. The closer the distance estimation in the algorithm is with the actual value, the faster the final search speed is.)