package main

import (
	"fmt"
	"time"
)

func server1(ch chan string) {
	time.Sleep(1 * time.Second) //可取消
	ch <- "from server1"
}
func server2(ch chan string) {
	time.Sleep(1 * time.Second) //可取消
	ch <- "from server2"

}
func main() {
	output1 := make(chan string)
	output2 := make(chan string)

	var reply string
	for i := 0; i < 10; i++ {
		go server1(output1)
		go server2(output2)
		time.Sleep(1 * time.Second)
		select {
		case reply = <-output1:
			fmt.Println(reply)
		case reply = <-output2:
			fmt.Println(reply)
		}
	}

}

代码分析：
我们这里让两个通道同时有信息返回，这样select就会随机选择通道

结果显示：