▶ 运行代码package main
import ("fmt"; "time")
func worker(id int) {
    fmt.Printf("Worker %d started\n", id)
    time.Sleep(time.Second)
}
func main() {
    for i := 0; i < 5; i++ {
        go worker(i)
    }
    time.Sleep(2 * time.Second)
}