Redis教程（2）
redis 127.0.0.1:6379> get key1 "HongWan1"redis 127.0.0.1:6379> get key2
"HongWan2"
redis 127.0.0.1:6379> msetnx key2 HongWan2_new key3 HongWan3
(integer) 0
redis 127.0.0.1:6379> get key2
"HongWan2"
redis 127.0.0.1:6379> get key3
(nil)
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