设置登录接口默认值

app/controller/User.php

@@ -33,8 +33,8 @@ class User extends BaseController
     public function login()
     {
         // 获取输入数据
-        $userName = trim(Request::post('user_name'));
-        $password = trim(Request::post('password'));
+        $userName = trim(Request::post('user_name', ''));
+        $password = trim(Request::post('password', ''));
 
         // 验证输入数据
         $checkMessage = $this->validateInput([