go 结构体方法和结构体指针方法 (&p1).SetV2 也可以简写成 p1.SetV2

package main

import (
	"fmt"
)


type People struct {
	Name string
	Country string	
}

func (p People)Print(){
	fmt.Printf("name=%s country=%s\n",p.Name,p.Country)
}

func (p People)Set(name string, country string){
	p.Name = name
	p.Country = country
	fmt.Printf("Set name=%s country=%s\n",p.Name,p.Country)
}


func (p *People)SetV2(name string, country string){
	fmt.Printf("SetV2 before name=%s country=%s\n",p.Name,p.Country)
	p.Name = name
	p.Country = country
	fmt.Printf("SetV2 after name=%s country=%s\n",p.Name,p.Country)
}

func main(){
	var p1 People = People{
		Name :"people01",
		Country :"China",
	} 
	p1.Print()

	p1.Set("people02","中国1")
	p1.Print()

	p1.SetV2("people04","中国4")
	p1.Print()

	(&p1).SetV2("people02","中国2")    //(&p1).SetV2  也可以简写成 p1.SetV2
	p1.Print()

	p1.SetV2("people03","中国3")
	p1.Print()
}

输出:

name=people01 country=China
Set name=people02 country=中国1
name=people01 country=China
SetV2 before name=people01 country=China
SetV2 after name=people04 country=中国4
name=people04 country=中国4
SetV2 before name=people04 country=中国4
SetV2 after name=people02 country=中国2
name=people02 country=中国2
SetV2 before name=people02 country=中国2
SetV2 after name=people03 country=中国3
name=people03 country=中国3