go 接口作为方法参数传递 

接口作为方法参数传递 在方法内部修改结构体，示例

type IUserService interface {
	GenId()
}

type UserService struct {
	id string
}

func (u *UserService) GenId() {
	generateUUID, _ := uuid.GenerateUUID()
	u.id = generateUUID
}

func BuildUser(service IUserService) {
	service.GenId()
}

func main() {
	userService := UserService{}
	BuildUser(&userService)
	//BuildUser(userService) *UserService实现了IUserService，UserService没有实现IUserService 
	println(userService.id)
}