```
package main
import (
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"time"
)
func main(){
start := time.Now()
ch := make(chan string)
for _,url : range os.Args[1:]{
go fetch(url,ch)
}
for range os.Args[1:]{
fmt.Println(<-ch)
}
fmt.Printf("%.2fs elapsed\n",time.Since(start.Seconds())
}
func fetch(url string,ch chan<- string){
start := time.Now()
resp,err := http.Get(url)
if err != nil{
ch <- fmt.Sprint(err)
return
}
}
```
+ make(chan string) 是什么意思
+ func fetch(url string, *** ch chan<-string ***){ 这又是什么意思
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