修改推荐人，优化

application/api/controller/User.php

@@ -388,18 +388,14 @@ class User extends Api
         }
 
         if(isset($data['introcode']) && !empty($data['introcode'])){
-            $intro_user = Db::name('user')->where('introcode',$data['introcode'])->value('id');
-            /*if(!$intro_user){
-                $this->error('不存在的邀请人');
-            }
-            if(!empty($this->auth->intro_uid)){
-                $this->error('您已经填写过邀请人');
-            }*/
+            $intro_user = Db::name('user')->where('introcode',$data['introcode'])->field('id,intro_uid')->find();
+
 
-            if($intro_user && empty($this->auth->intro_uid)){
+            if(!empty($intro_user) && empty($this->auth->intro_uid)
+                && $intro_user['id'] != $this->auth->id && $intro_user['intro_uid'] != $this->auth->id){
 
                 unset($data['introcode']);//别人的邀请码，不能改了自己的
-                $data['intro_uid'] = $intro_user;
+                $data['intro_uid'] = $intro_user['id'];
 
                 //邀请用户注册，给邀请人奖励
                 if(isset($data['intro_uid']) && !empty($data['intro_uid'])){