Make sure that jQuery.data( elem ) always returns a data object, fixes #5971. Improve the performance of .bind() and .unbind(), fixes #5972.

1 files changed, 7 insertions, 10 deletions

diff --git a/src/data.js b/src/data.js
index e3dc1902a..0049a9f4e 100644
--- a/src/data.js
+++ b/src/data.js
@@ -1,5 +1,4 @@
 var expando = "jQuery" + now(), uuid = 0, windowData = {};
-var emptyObject = {};
 
 jQuery.extend({
 	cache: {},
@@ -25,8 +24,7 @@ jQuery.extend({
 
 		var id = elem[ expando ], cache = jQuery.cache, thisCache;
 
-		// Handle the case where there's no name immediately
-		if ( !name && !id ) {
+		if ( !id && typeof name === "string" && data === undefined ) {
 			return null;
 		}
 
@@ -40,17 +38,16 @@ jQuery.extend({
 		if ( typeof name === "object" ) {
 			elem[ expando ] = id;
 			thisCache = cache[ id ] = jQuery.extend(true, {}, name);
-		} else if ( cache[ id ] ) {
-			thisCache = cache[ id ];
-		} else if ( typeof data === "undefined" ) {
-			thisCache = emptyObject;
-		} else {
-			thisCache = cache[ id ] = {};
+
+		} else if ( !cache[ id ] ) {
+			elem[ expando ] = id;
+			cache[ id ] = {};
 		}
 
+		thisCache = cache[ id ];
+
 		// Prevent overriding the named cache with undefined values
 		if ( data !== undefined ) {
-			elem[ expando ] = id;
 			thisCache[ name ] = data;
 		}