案例一:协程创建和使用

//使用defer来预防协程发生错误
package main
import (
    "fmt"
    "time"
)
func Spinner(delay time.Duration){
    for {
        for _,r:= range `-|/` {
            fmt.Printf("
%c",r);
            time.Sleep(delay);
        }
    }
}
func fib(x int ) int {
    if x <2 {
        return x
    }
    return fib(x-1) + fib(x-2);
}
func main (){
    go Spinner(100 * time.Millisecond);
    const n=80;
    fibN:=fib(n);
    fmt.Println(fibN);
}

这是运行结果