Channel Synchronization

package main

import "fmt"

import "time"

func worker(done chan bool) {

    fmt.Print("working...")

    //暂停

    time.Sleep(time.Second)

    fmt.Println("done")

    done <- true

}

func main() {

    done := make(chan bool, 1)

    //开启go并发goroutine

    go worker(done)

    //异步

    <-done

}