原文
http://redis.io/commands/zrem
简介
Remove one or more members from a sorted set.
从有序集合中删除一个或多个成员。
语法
ZREM key member [member ...]
版本
Available since 1.2.0.
自1.2.0版本可用。
时间复杂度
Time complexity: O(M*log(N)) with N being the number of elements in the sorted set and M the number of elements to be removed.
O(M*log(N))：N是有序集合中元素的数量，M是要删除的元素的数量。
描述
Removes the specified members from the sorted set stored at key. Non existing members are ignored.
从有序集合中删除指定的成员。忽略不存在的成员。
An error is returned when key exists and does not hold a sorted set.
当key存在但不是有序集合时，返回错误。
返回值
Integer reply, specifically:
The number of members removed from the sorted set, not including non existing members.
Integer：返回从有序集合中删除的成员的数量，不包括不存在的成员。
历史
>= 2.4: Accepts multiple elements. In Redis versions older than 2.4 it was possible to remove a single member per call.
在Redis 2.4及以上版本，可以接受多个元素。在Redis 2.4之前版本，每次只能删除一个成员。
例子
redis> ZADD myzset 1 "one"
(integer) 1
redis> ZADD myzset 2 "two"
(integer) 1
redis> ZADD myzset 3 "three"
(integer) 1
redis> ZREM myzset "two"
(integer) 1
redis> ZRANGE myzset 0 -1 WITHSCORES
1) "one"
2) "1"
3) "three"
4) "3"
redis>