import 'music_data_cache_native.dart' if (dart.library.html) 'music_data_cache_web.dart' as impl; /// 乐曲元数据的磁盘缓存,Web 平台为空实现。读失败返回 null,写失败静默忽略。 Future readTextCache(String fileName) => impl.readTextCache(fileName); Future writeTextCache(String fileName, String content) => impl.writeTextCache(fileName, content);