说明：  由于自己经常需要在家里、单位、工作地点之间切换IP地址，每次更改来更改去，非常麻烦，所以自己做了这样一个工具，现在分享出来供大家使用
(Because they often need to switch between at home, work units, where IP address, every time you make a change to change to, very troublesome, so do the such a tool, now share out for everyone to use )