go 方法

Go 既允许使用值，也允许使用指针来调用方法，不必严格符合接收者的类型。

package main

import (
    "fmt"
)

type user struct {
    name  string
    email string
}

func (u user) notify() {
    fmt.Printf("Sending: %s -> %s \n", u.name, u.email)
}

func (u *user) change(email string) {
    u.email = email
}

func main() {

    bill := user{"Bill", "bill@email.com"}
    bill.notify()

    lisa := &user{"lisa", "lisa@email.com"}
    lisa.notify()

    bill.change("bill@new.com")
    bill.notify()

    lisa.change("lisa@new.com")
    lisa.notify()
}

Sending: Bill -> bill@email.com 
Sending: lisa -> lisa@email.com 
Sending: Bill -> bill@new.com 
Sending: lisa -> lisa@new.com