add image delete

controllers/wechatimg/wechatimt.go

@@ -143,6 +143,8 @@ func (c *WechatImgController) AddNewImg() {
 	defer file.Close()
 
 	imgurl := "./upload/" + head.Filename
+	defer os.Remove(imgurl)
+
 	//创建文件
 	fW, err := os.Create(imgurl)
 	if err != nil {