Made isPlainObject() supporting null, undefined, and window values on IE too. Also...

[jquery.git] / src / core.js

diff --git a/src/core.js b/src/core.js
index 1edf98e..bc48e5d 100644 (file)
--- 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 ) {}