Go/流程控制/defer-延迟调用

## defer

延迟调用，函数结束前执行

先进后出

异常发生后，前面的defer语句依旧会执行

常作 资源清理、异常处理

package main

import "fmt"

func test(x int){
	a := 1 / x
	a += a
}

func main(){
	fmt.Println("1111111")
	test(0)
	fmt.Println("2222222")
}

=======
1111111
panic: runtime error: integer divide by zero

goroutine 1 [running]:
main.test(...)
	E:/Code/Go/defer/main.go:6

func main(){
	defer fmt.Println("0000000")
	defer fmt.Println("1111111")
	test(0)
	defer fmt.Println("2222222")
}
===============
1111111
0000000
panic: runtime error: integer divide by zero

func main(){
	defer fmt.Println("0000000")
	defer fmt.Println("1111111")
	defer test(0)
	defer fmt.Println("2222222")
}
==========
2222222
1111111
0000000
panic: runtime error: integer divide by zero