goroutine

package main

import "fmt"

func f(from string) {

    for i := 0; i < 3; i++ {

        fmt.Println(from, ":", i)

    }

}

func main() {

    f("direct")

    //go并发 关键字go

    go f("goroutine")

    go func(msg string) {

        fmt.Println(msg)

    }("going")

    var input string

    //scanln函数扫描获取输入信息

    fmt.Scanln(&input)

    fmt.Println("done")

}