package main

import (
    "log"
    "sync"
)

func main() {
    wg := sync.WaitGroup{}
    for i := 0; i < 5; i++ {
        wg.Add(1)
        go func(number int) {
            defer wg.Done()
            //do something
            log.Println(number)
        }(i)
    }
    wg.Wait()

    log.Println("哈利路亚")

}