diff --git a/library/think/App.php b/library/think/App.php
index b6e28404..61ef4808 100644
--- a/library/think/App.php
+++ b/library/think/App.php
@@ -128,11 +128,13 @@ class App
         // 输出数据到客户端
         if ($data instanceof Response) {
             return $data;
-        } else {
+        } elseif(!is_null($data)) {
             // 默认自动识别响应输出类型
             $isAjax = $request->isAjax();
             $type   = $isAjax ? Config::get('default_ajax_return') : Config::get('default_return_type');
-            return Response::create( is_null($data) ? '' : $data, $type);
+            return Response::create($data, $type);
+        } else {
+            return Response::create();
         }
     }
 
diff --git a/library/think/Response.php b/library/think/Response.php
index c986e5a8..2a2c7067 100644
--- a/library/think/Response.php
+++ b/library/think/Response.php
@@ -51,15 +51,12 @@ class Response
     public function __construct($data = [], $type = '', $options = [])
     {
         $this->data = $data;
-        if (empty($type)) {
-            $isAjax = Request::instance()->isAjax();
-            $type   = $isAjax ? 'json' : 'html';
-        }
-        $this->type = strtolower($type);
+        $this->type = empty($type) ? 'null' : strtolower($type);
 
         if (isset($this->contentTypes[$this->type])) {
             $this->contentType($this->contentTypes[$this->type]);
         }
+
         if (!empty($options)) {
             $this->options = array_merge($this->options, $options);
         }
@@ -77,11 +74,7 @@ class Response
      */
     public static function create($data = [], $type = '', $options = [])
     {
-        if (empty($type)) {
-            $isAjax = Request::instance()->isAjax();
-            $type   = $isAjax ? 'json' : 'html';
-        }
-        $type = strtolower($type);
+        $type = empty($type) ? 'null' : strtolower($type);
 
         if (!isset(self::$instance[$type])) {
             $class = (isset($options['namespace']) ? $options['namespace'] : '\\think\\response\\') . ucfirst($type);