同步等待 panic defer 

package main

import(
    "fmt"
)

func main(){
    // fmt.Println("Hello World")
    defer_all()
}

func defer_all(){
    defer func(){ fmt.Println("打印前") }()
    defer func(){ fmt.Println("打印中") }()
    defer func(){ fmt.Println("打印后") }()
    
    panic("触发异常")
}