请教多文件files在小程序中如何传递给后端

多文件在数据库正确保存为  {"file":["11","12","13"],"title":["home_life1","partner1","home_life3"],"description":["","",""]}

小程序前端 怎么定义才能为正确的格式，我这样做格式为 {"file":["25,26"],"title":[""],"description":[""]}