sismember缩写
SISMEMBER key member 判断member元素是否是集合key的成员
英文:
Returns if member is
a member
of the set stored at key.
is member 是否是集合的成员
SISMEMBER key member 判断member元素是否是集合key的成员
英文:
Returns if member is
a member
of the set stored at key.
is member 是否是集合的成员