# Functions
Close 关闭连接.
Connect 连接etcd.
Get 根据key获取value.
NewLocker 创建一个锁.
NewLockerAndLock 新建锁+锁key.
Put 设置key, ttl为租约期, 单位为秒.
UnlockAndClose 解锁和关锁.
WithPingKeyPrefix 设置ping key的前缀.
WithUserAndPass 设置用户名密码.
# Type aliases
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