EVENT NOTIFICATION部分：
1.说明：
# Redis can notify Pub/Sub clients about events happening in the key space.
# This feature is documented at http://redis.io/topics/notifications
#
# For instance if keyspace events notification is enabled, and a client
# performs a DEL operation on key "foo" stored in the Database 0, two
# messages will be published via Pub/Sub:
#
# PUBLISH __keyspace@0__:foo del
# PUBLISH __keyevent@0__:del foo
Redis可以通知Pub/Sub客户端key空间中发生的事件
例如，如果启用了keyspace事件通知，并且客户端对存储在数据库0中的键“foo”执行DEL操作，则将通过Pub/Sub发布两条消息
2.监听类型：
# It is possible to select the events that Redis will notify among a set
# of classes. Every class is identified by a single character:
#
# K Keyspace events, published with __keyspace@<db>__ prefix.
# E Keyevent events, published with __keyevent@<db>__ prefix.
# g Generic commands (non-type specific) like DEL, EXPIRE, RENAME, ...
# $ String commands
# l List commands
# s Set commands
# h Hash commands
# z Sorted set commands
# x Expired events (events generated every time a key expires)
# e Evicted events (events generated when a key is evicted for maxmemory)
# A Alias for g$lshzxe, so that the "AKE" string means all the events.
#
# The "notify-keyspace-events" takes as argument a string that is composed
# of zero or multiple characters. The empty string means that notifications
# are disabled.
可以在一组类中选择Redis将通知的事件。每个类都由一个字符标识：
K key空间事件
E key事件事件
g 一般事件
$ 字符串命令
l 列表命令
s 集合命令
h hash命令
z 有序集合命令
x 过期事件
A 所有事件
notify-keyspace-events将零个或多个字符组成的字符串作为参数。空字符串表示通知被禁用
3.配置：
# By default all notifications are disabled because most users don't need
# this feature and the feature has some overhead. Note that if you don't
# specify at least one of K or E, no events will be delivered.
notify-keyspace-events ""
默认情况下，所有通知都被禁用，因为大多数用户不需要此功能，而且此功能有一些开销。请注意，如果未指定K或E中的至少一个，则不会传递任何事件
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