redis-setbit理解
https://blog.csdn.net/hgd613/article/details/54095729
分布式缓存Redis之bitmap、setbit
https://blog.csdn.net/u011489043/article/details/78990162
Redis 教程
https://www.runoob.com/redis/strings-setbit.html
原文：https://www.cnblogs.com/kelelipeng/p/13266071.html