接口声明

type ILearn interface {
}

接口继承

type Humaner interface {
    sayhi()
}
type Personer interface {
    Humaner // 匿名字段，继承sayhi()
    sing()
}
type Student struct {
    name string
    id int
}
// Student 实现了 sayhi()
func (tmp *Student) sayhi() {
}