Indicates whether the specified ip address is the loopback address 指示指定的ip地址是否是环回地址。
2.
Provides the ip loopback address 提供ip环回地址。
3.
The illustration shows that the broker is running on the same machine as the client application since the local loopback address is used 演示表明代理和客户端应用程序运行在同一台机器上，这是因为使用了本地回环地址。
4.
You can connect to that port only if your client application is running on the same machine and is connecting through the loopback address localhost or 127 . 0 . 0 . 1 仅当客户端应用程序运行在同一机器上并且通过环回地址（ localhost或127 . 0 . 0 . 1 ）连接时才能连接到该端口。
5.
Programs that connect to ip addresses in the loopback address range may not work as expected and you may receive an error message indicating you cannot establish a connection 连接到环回地址范围内的ip地址的程序可能无法正常工作，您可能会接收到错误消息，指明无法建立连接。
