521YY公交导航系统，一个地图API密钥只对一个“目录”或域有效。您必须有百度帐户才能获得地图API密钥http://openapi.baidu.com/map/getKey.html，本系统只为初学者研究。-521YY Transit navigation system, a map API key is known only to a directory or a valid domain. You must have an account to get Baidu Maps API