From: Ariel Flesler <aflesler@gmail.com>
Date: Sat, 18 Oct 2008 22:22:08 +0000 (+0000)
Subject: jquery core: closes #3485. Fixing a memory leak on IE.
X-Git-Url: http://git.asbjorn.it/?a=commitdiff_plain;h=63bfe1ded1fe01d326594e9a757a2c2ceab8d8ae;p=jquery.git

jquery core: closes #3485. Fixing a memory leak on IE.
---

diff --git a/src/core.js b/src/core.js
index 829e153..9279d17 100644
--- a/src/core.js
+++ b/src/core.js
@@ -612,10 +612,14 @@ jQuery.extend({
 	},
 
 	// See test/unit/core.js for details concerning this function.
-	// Since 1.3 DOM methods and function like alert
+	// Since version 1.3, DOM methods and functions like alert
 	// aren't supported. They return false on IE (#2968).
+	
+	// Memory leaks appear in IE6 when applying instanceof 
+	// to the window, document or any other COM object (#3485)
+	// http://ajaxian.com/archives/working-aroung-the-instanceof-memory-leak
 	isFunction: function( fn ) {
-		return fn instanceof Function;
+		return !!fn && !!fn.hasOwnProperty && fn instanceof Function;
 	},
 
 	// check if an element is in a (or is an) XML document