package main

import (
	"fmt"
	"time"
)

func main() {
	ch1 := make(chan string)
	ch2 := make(chan string)

	// 模拟两个不同来源的“数据源”
	go func() {
		time.Sleep(1 * time.Second)
		ch1 <- "result from ch1 (1s)"
	}()

	go func() {
		time.Sleep(2 * time.Second)
		ch2 <- "result from ch2 (2s)"
	}()

	fmt.Println("等待 ch1 或 ch2 的结果...（谁先来处理谁）")

	select {
	case v := <-ch1:
		fmt.Println("收到 ch1:", v)
	case v := <-ch2:
		fmt.Println("收到 ch2:", v)
	}

	fmt.Println("main 结束")
}