优化歌手格式

@@ -91,6 +91,7 @@ class IssueService extends Service
                 $item->cover = $cos->getPreviewUrl($item->songs_album->cover->key);
                 $item->cover = $cos->getPreviewUrl($item->songs_album->cover->key);
             }
             }
             unset($item->songs_album);
             unset($item->songs_album);
+            $item->singer = explode(',', $item->singer);
         }
         }
 
 
         return Response::success($res);
         return Response::success($res);