Golang协程实现流量统计系统（3）

package main

import "fmt"

func main() {
    fmt.Println("Hello world!")
}

package main

import (
"fmt"
)

func main() {
    message := make(chan string)//定义一个string型的channel
    go func() {
        message <- "hello goroutine!"
    }()
    
    fmt.Println( <- message )
    fmt.Println("Hello world!")
}

package main

import (
    "fmt"
    "time"
)

func main() {
    message := make(chan string) //定义一个string型的channel
    go func() {
        message <- "hello goroutine!"
    }()
    go func() {
        time.Sleep(2 * time.Second)
        str := <-message
        str = str + "I‘m goroutine!"
        message <- str
    }()
    time.Sleep(3 * time.Second)
    fmt.Println(<-message)
    fmt.Println("Hello world!")
}