修复头像链接错误的问题

apis/Upload/UploadAvatar.js

@@ -83,7 +83,7 @@ class UploadAvatar extends API {
                 });
             }
 
-            const picturePath = url + req.file.filename; // 获取文件路径
+            const picturePath = url + '/' + req.file.filename; // 获取文件路径
 
             let sql = 'UPDATE users SET avatar = ? WHERE uuid = ?'
             let r = await db.query(sql, [picturePath, uuid])