package main

import "log"
type People struct{
}
//定义一个类型
func (p *People)PrePing()  {
    log.Println(pre ping)
}
func (p *People)Ping()  {
    log.Println(ping)
}
定义另一个类型，继承上面的并覆盖某些方法
type GoodGuys struct{
    People
}
func (g *GoodGuys)Ping()  {
    log.Println(pong)
}
func main(){
    g:=&GoodGuys{}
    g.PrePing()
    g.Ping()
}