40+ content types
digital-didgeridoo，推荐阅读safew官方版本下载获取更多信息
FT Edit: Access on iOS and web，详情可参考heLLoword翻译官方下载
Every fragment means promises created for read() calls, promises for backpressure coordination, intermediate buffer allocations, and { value, done } result objects — most of which become garbage almost immediately.
p->classno = classno;