set

sadd key member1 member2

scard key 获取集合元素个数

sdiff key1 key2 差集 key1-key2的差集   sdiff key1 key2 不等于 sdiff key2 key1 

sdiffstore newkey ke1 key2  key1 - key2的差集，且保存到newkey中

smembers key 展示所有的元素

sismember key member 判断元素是否在key中

sinter key1 key2 交集

sinterstore newkey key1 key2

spop key 随机移除一个元素

srem key member 移除一个或者多个元素

sunion key1 key2 返回并集

sunionstore newkey key1 key2  并集存储到newkey

smove sourcekey desckey member 将member移到desckey

sscan key  cursor  match pattern