闭包

package main

import "fmt"

func aaa() {
	i := 1
	defer fmt.Println("aaa:", i) //1
	i++
}

func bbb() {
	i := 1
	defer func() {
		fmt.Println("bbb:", i) // 2
	}()
	i++
}

func main() {
	aaa()
	bbb()
}