golang学习笔记——select

select就是用来监听和channel有关的IO操作，当 IO 操作发生时，触发相应的动作

package main

 

import (

    "fmt"

    "time"

)

 

func main() {

    ch := make(chan int)

    o := make(chan bool)

 

    go func() {

         for {

                 select {

                 case <-time.After(3 * time.Second):

                         fmt.Println("超时")

                         o <- true

                 case num := <-ch:

                         fmt.Println(num)

                 }

         }

    }()

 

    <-o

}