diff --git a/library/think/App.php b/library/think/App.php
index 3d94c8bf..9f1aaeb0 100644
--- a/library/think/App.php
+++ b/library/think/App.php
@@ -254,9 +254,9 @@ class App
                 $class = $param->getClass();
                 if ($class) {
                     $className = $class->getName();
-                    if (isset($vars[$name]) && $vars[$name] instanceof $className) {
-                        $args[] = $vars[$name];
-                        unset($vars[$name]);
+                    $bind      = Request::instance()->$name;
+                    if ($bind instanceof $className) {
+                        $args[] = $bind;
                     } else {
                         $args[] = method_exists($className, 'instance') ? $className::instance() : new $className();
                     }
diff --git a/library/think/Request.php b/library/think/Request.php
index a73b4fa5..fb39356f 100644
--- a/library/think/Request.php
+++ b/library/think/Request.php
@@ -117,6 +117,8 @@ class Request
     protected static $hook = [];
     // 绑定的属性
     protected $bind = [];
+    // php://input
+    protected $input;
 
     /**
      * 架构函数
@@ -133,6 +135,8 @@ class Request
         if (is_null($this->filter)) {
             $this->filter = Config::get('default_filter');
         }
+        // 保存 php://input
+        $this->input = file_get_contents('php://input');
     }
 
     public function __call($method, $args)
@@ -698,7 +702,7 @@ class Request
     public function put($name = '', $default = null, $filter = null)
     {
         if (is_null($this->put)) {
-            $content = file_get_contents('php://input');
+            $content = $this->input;
             if (strpos($content, '":')) {
                 $this->put = json_decode($content, true);
             } else {
@@ -1416,11 +1420,21 @@ class Request
     public function getContent()
     {
         if (is_null($this->content)) {
-            $this->content = file_get_contents('php://input');
+            $this->content = $this->input;
         }
         return $this->content;
     }
 
+    /**
+     * 获取当前请求的php://input
+     * @access public
+     * @return string
+     */
+    public function getInput()
+    {
+        return $this->input;
+    }
+
     /**
      * 生成请求令牌
      * @access public
@@ -1464,4 +1478,9 @@ class Request
     {
         return isset($this->bind[$name]) ? $this->bind[$name] : null;
     }
+
+    public function __isset($name)
+    {
+        return isset($this->bind[$name]);
+    }
 }