optimize log tool

dri/download/download.go

@@ -10,29 +10,30 @@ import (
 )
 
 //下载文件
-func Down(url, path, name string) bool {
+func Down(url, path, name string, e ...*Error) bool {
 
 	os.MkdirAll(path, os.ModeDir)
 	if Substr(path, len(path)-1, len(path)) != "/" {
 		path = path + "/"
 	}
 	out, err := os.Create(path + name)
-	e := Error{}
-	if err != nil {
-		e.SetError(err)
+
+	if err != nil && e[0] != nil {
+		e[0].SetError(err)
 		return false
 	}
 	defer out.Close()
 	resp, err := http.Get(url)
-	if err != nil {
+	if err != nil && e[0] != nil {
+		e[0].SetError(err)
 		return false
 	}
 	defer resp.Body.Close()
 
 	pix, err := ioutil.ReadAll(resp.Body)
 	_, err = io.Copy(out, bytes.NewReader(pix))
-	if err != nil {
-		e.SetError(err)
+	if err != nil && e[0] != nil {
+		e[0].SetError(err)
 		return false
 	}
 	return true