背景：在用zkCli连接zkServer时产生的。
命令格式错了，在zkCli连接zkServer时，用命令:
./zkCli.sh -server ip:port 这是格式规范 ./zkCli.sh -server localhost:2181 这是具体例子
按照这样的格式来输入就不会出现这样的错误了。
-------------------------------------------------------------------
zk启动命令是:./zkServer.sh start
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