package mainimport ( "fmt")type USB interface { Name() string Connect()}type PhoneConnector struct { name string}func (pc PhoneConnector) Name() string { return pc.name}func (pc PhoneConnector) Connect() { fmt.Println("Connected:" + pc.name)}func Disconnect(usb USB) { if pc, ok := usb.(PhoneConnector); ok { fmt.Println("a usb Disconnected , and it's name is :" + pc.name) return } fmt.Println("unkown device")}func main() { var iphone USB iphone = PhoneConnector{"iphone"} iphone.Connect() Disconnect(iphone)} 输出结果： Connected:iphone a usb Disconnected , and it's name is :iphone