package main

import (
	"fmt"
	"time"
)

func main() {
	fmt.Println("等待 1 秒...")
	timer := time.NewTimer(1 * time.Second)
	defer timer.Stop()

	<-timer.C
	fmt.Println("Timer 触发")

	// 超时控制
	done := make(chan bool)
	go func() {
		time.Sleep(2 * time.Second)
		done <- true
	}()

	select {
	case <-done:
		fmt.Println("任务完成")
	case <-time.After(1 * time.Second):
		fmt.Println("任务超时")
	}
}