fix

@@ -30,7 +30,7 @@ const requiredAPI = (req, res, next) => {
         req.session.captcha = CAPTCHA;
 
         return res.json({
-            code: 403,
+            code: 405,
             message: '该验证码已失效，请刷新验证码'
         });
     }
@@ -86,7 +86,7 @@ const checkAPI = (req, res) => {
         req.session.captcha = CAPTCHA;
 
         return res.json({
-            code: 403,
+            code: 405,
             message: '该验证码已失效，请刷新验证码'
         });
     }