后端代码错误处理更新4

server/routes/users.js

@@ -23,7 +23,7 @@ router.get('/getUser', function (req, res, next) {
     // }
     const SQL = 'SELECT * FROM `user` WHERE `user`.uid = ?'
     Mysql.query(SQL, [uid], (err, result) => {
-        if (err || !result || !result?.length) {
+        if (err || !result || !result.length) {
             res.send({
                 success: false,
                 err