diff --git a/library/think/Hook.php b/library/think/Hook.php
index f5e55af4..9746f487 100644
--- a/library/think/Hook.php
+++ b/library/think/Hook.php
@@ -114,7 +114,7 @@ class Hook
 
     /**
      * 执行某个行为
-     * @param string $class 行为类名称
+     * @param mixed $class 要执行的行为
      * @param string $tag 方法名（标签名）
      * @param Mixed $params 传人的参数
      * @return mixed
@@ -122,9 +122,15 @@ class Hook
     public static function exec($class, $tag = '', &$params = null)
     {
         if ($class instanceof \Closure) {
-            return $class($params);
+            $result = call_user_func_array($class, $params);
+        } elseif (is_object($class)) {
+            $result = call_user_func_array([$class, $tag], $params);
+        } elseif (is_array($class)) {
+            $result = call_user_func_array($class, $params);
+        } else {
+            $obj    = new $class();
+            $result = ($tag && is_callable([$obj, $tag])) ? $obj->$tag($params) : $obj->run($params);
         }
-        $obj = new $class();
-        return ($tag && is_callable([$obj, $tag])) ? $obj->$tag($params) : $obj->run($params);
+        return $result;
     }
 }
diff --git a/library/think/Request.php b/library/think/Request.php
index 3787d11a..8427a4a5 100644
--- a/library/think/Request.php
+++ b/library/think/Request.php
@@ -42,7 +42,7 @@ class Request
     protected $baseFile;
 
     /**
-     * @var string 根目录
+     * @var string 访问的ROOT地址
      */
     protected $root;