一、set
1、添加
sadd setName a b c
answer n (成功添加的个数)
2、判断元素是否存在
sismember setName a
answer n (0: 不存在,1:存在)
3、查看所有元素
smembers setName
- "c"
- "d"
- "a"
4、查看setName数量
scard setName
answer n (个数)
sadd setName a b c
answer n (成功添加的个数)
sismember setName a
answer n (0: 不存在,1:存在)
smembers setName
scard setName
answer n (个数)