1. package main
    3. import (
    4.     "fmt"
    5.     "time"
    6. )
    8. func main() {
    9.     c := make(chan struct{}, 1)
    10.     go func() {
    11.         fmt.Println(time.Now().Format("2006-01-02 15:04:05"))
    12.         time.Sleep(time.Second * 5)
    13.     close(c)
    14.     // c <- struct{}{}
    15.     }()
    17.   // 等待 goroutine
    18.   <-c
    19.     fmt.Println(time.Now().Format("2006-01-02 15:04:05"))
    20. }