Unity判断在什么平台运行，获取对应路径的小技巧

#if UNITY_EDITOR
         filepath = Application.dataPath + "/json.json";
#elif UNITY_IPHONE
        //没有试过 
         filepath = Application.dataPath +"/Json"+"/json.json";
#elif UNITY_ANDROID
        //android路径：/storage/emulated/0/Android/data/包名/files/ip.txt
         filepath =  Application.persistentDataPath + "/json.json";
#endif