Golang匿名字段 ：可以像字段成员那样访问匿名字段方法，编译器负责查找。 ~~~ package main import "fmt" type User struct { id int name string } type Manager struct { User } func (self *User) ToString() string { // receiver = &(Manager.User) return fmt.Sprintf("User: %p, %v", self, self) } func main() { m := Manager{User{1, "Tom"}} fmt.Printf("Manager: %p\n", &m) fmt.Println(m.ToString()) } ~~~ 输出结果: ~~~ Manager: 0xc42000a060 User: 0xc42000a060, &{1 Tom} ~~~ 通过匿名字段，可获得和继承类似的复用能力。依据编译器查找次序，只需在外层定义同名方法，就可以实现 "override"。 ~~~ package main import "fmt" type User struct { id int name string } type Manager struct { User title string } func (self *User) ToString() string { return fmt.Sprintf("User: %p, %v", self, self) } func (self *Manager) ToString() string { return fmt.Sprintf("Manager: %p, %v", self, self) } func main() { m := Manager{User{1, "Tom"}, "Administrator"} fmt.Println(m.ToString()) fmt.Println(m.User.ToString()) } ~~~ 输出结果: ~~~ Manager: 0xc420074180, &{{1 Tom} Administrator} User: 0xc420074180, &{1 Tom} ~~~