X-Git-Url: http://git.asbjorn.it/?a=blobdiff_plain;f=src%2Fcore.js;h=bc48e5d47dc3dd95b9cdecf706d5e2030c6ec4bd;hb=148fb7ba8e992dd70c64cdc6a1c6f643fd1ba160;hp=1edf98edcaceeb5c80c68d4c69a643628fea3404;hpb=27d65b59f96460987abb84dadc3a75dde8826b3a;p=jquery.git

diff --git a/src/core.js b/src/core.js
index 1edf98e..bc48e5d 100644
--- a/src/core.js
+++ b/src/core.js
@@ -425,19 +425,21 @@ jQuery.extend({
 	},
 
 	isPlainObject: function( obj ) {
-		if ( toString.call(obj) !== "[object Object]" || typeof obj.nodeType === "number" ) {
+		// Must be an Object.
+		// Because of IE, we also have to check the presence of the constructor property.
+		if ( !obj || toString.call(obj) !== "[object Object]" || !("constructor" in obj) ) {
 			return false;
 		}
 		
-		// not own constructor property must be Object
+		// Not own constructor property must be Object
 		if ( obj.constructor
 			&& !hasOwnProperty.call(obj, "constructor")
 			&& !hasOwnProperty.call(obj.constructor.prototype, "isPrototypeOf") ) {
 			return false;
 		}
 		
-		//own properties are iterated firstly,
-		//so to speed up, we can test last one if it is own or not
+		// Own properties are enumerated firstly, so to speed up,
+		// if last one is own, then all properties are own.
 	
 		var key;
 		for ( key in obj ) {}