Go语言 之延迟调用defer

// 延迟调用defer project main.go
package main

import (
    "fmt"
    "test"
)

func f1() (r int) {
    //延迟调用+匿名函数
    defer func() {
        r++
    }()
    r = 0
    return
}

func double(x int) int {
    fmt.Println("double")
    return x + x
}

func tal(x int) (r int) {
    defer func() {
        fmt.Println("func")
        r += x
    }()
    fmt.Println("tal")
    return double(x)
}

func main() {
    fmt.Println(tal(3))
    i := f1()
    fmt.Print(i)

    TestA()
}