// code_22_interface_field_interface project main.gopackage mainimport ( "fmt")type Humaner interface { SayHi()}type Personer interface { Humaner Sing(lyrics string) //lyrics 歌词}type Student struct { name string score float64}func (s *Student) SayHi() { fmt.Printf("Student[%s, %f]say hi!\n", s.name, s.score)}func (s *Student) Sing(lyrics string) { fmt.Printf("Student sing[%s]!!\n", lyrics)}func main() { s := &Student{"ck_god", 88.88} var i2 Personer i2 = s //接口指向struct对象 i2.SayHi() i2.Sing("god is a girl") //var i3 Humaner = &Student{"ck_god", 88.88} //var i4 Personer = i1 //err //Personer为超集，Humaner为子集 var i5 Personer = &Student{"ck_god", 88.88} var i6 Humaner = i5 i6.SayHi()}//总结：通过赋值或者参数传递的形式,完成接口的调用。