sinter

sinter(intersection) 返回两个集合之间的交集

127.0.0.1:6379> smembers set1
1) "1"
2) "2"
3) "3"
4) "4"
127.0.0.1:6379> smembers set2
1) "1"
2) "2"
3) "3"
# 返回两个集合，都存在的元素，集合的顺序没有影响
127.0.0.1:6379> sinter set1 set2
1) "1"
2) "2"
3) "3"
127.0.0.1:6379> sinter set2 set1
1) "1"
2) "2"
3) "3"