defer func(参数){}

• 参考代码

func main(){
    fmt.Println("================打印顺序===============")
    a:=1
    b:=2
    defer calc("1",a,calc("10",a,b))
    a=0
    defer calc("2",a,calc("20",a,b))
    b=1
    fmt.Println("a=",a,"b=",b)
}

func calc(index string, a,b int)int{
    ret := a+b
    fmt.Println(index,a,b,ret)
    return ret
}
           

• 输出结果

================打印顺序===============
10 1 2 3
20 0 2 2
a= 0 b= 1
2 0 2 2
1 1 3 4
           

• 结果分析
  • defer运行特点
    • 在return之后执行
    • 先赋值后放入堆栈

转载于:https://www.cnblogs.com/MyUniverse/p/11577707.html