golang 数据类型map，slice，interface取值更新值问题

type Lamp struct {
	Brand string
	Color string
}

func (this *Lamp) open() {
	fmt.Println("open lamp,brand:", this.Brand)
}

type ILamp interface {
	open()
}

func main() {
	var lamp = Lamp{"Philips", "red"}
	var ilamp ILamp = lamp
	ilamp.open() // 编译error
	var ilamp1 ILamp = &lamp
	ilamp1.open() // 编译ok

	m := make(map[string]Lamp)
	m["a"] = lamp
	m["a"].Brand = "xiaomi" // 编译error
	temp := m["a"]
	temp.Brand = "xiaomi" // 编译ok

	m1 := make(map[string]*Lamp)
	m1["a"] = lamp
	m1["a"].Brand = "xiaomi" // 编译ok

	var s []Lamp
	s = append(s, lamp)
	s[0].Brand = "xiaomi" // ok
	s[0].open()           // ok
}type Lamp struct {
	Brand string
	Color string