go里面使用协程别的案例

package  main
//求1-200的阶乘
//使用go里面协程提高速度
//加锁是因为有资源竞争，所以加锁
import (
    "fmt"
    "sync"
    "time"
)
var (
     myMap=make(map[int]int,10);
     lock sync.Mutex;
)
func test(n int){
    res:=1;
    for i:=1;i<=n ; i++ {
        res+=i;
    }
    lock.Lock();
    myMap[n]=res;
    lock.Unlock();
}
func main(){
    for i:=1;i<200;i++ {
        go test(i);
    }
    time.Sleep(time.Second*10);
    lock.Lock();
    for k,v:=range myMap {
        fmt.Printf("map[%d]=%d\n",k,v);
    }
    lock.Unlock();
}