spop

spop(set pop 随机弹出一个元素，并从集合中移除

127.0.0.1:6379> sadd testSet 1 3 2 a
(integer) 4
127.0.0.1:6379> smembers testSet
1) "3"
2) "a"
3) "2"
4) "1"
127.0.0.1:6379> spop testSet
"1"
127.0.0.1:6379> spop testSet
"3"
127.0.0.1:6379> smembers testSet
1) "a"
2) "2"