Fixes regression in .attr(), patch by David Flanagan. Fixes #4884.

src/attributes.js

 jQuery.fn.extend({
 	attr: function( name, value ) {
-		var options = name, isFunction = jQuery.isFunction( value );
+		var elem, options, isFunction = jQuery.isFunction(value);
 
-		if ( typeof name === "string" ) {
-			// Are we setting the attribute?
-			if ( value === undefined ) {
+		if ( typeof name === "string" ) {     // A single attribute
+			if ( value === undefined ) {        // Query it on first element
 				return this.length ?
 					jQuery.attr( this[0], name ) :
 					null;
-
-			// Convert name, value params to options hash format
-			} else {
-				options = {};
-				options[ name ] = value;
+			} else {                            // Set it on all elements
+				for ( var i = 0, l = this.length; i < l; i++ ) {
+					elem = this[i];
+					if ( isFunction )
+						value = value.call(elem,i);
+					jQuery.attr( elem, name, value );
+				}
 			}
-		}
-
-		// For each element...
-		for ( var i = 0, l = this.length; i < l; i++ ) {
-			var elem = this[i];
-
-			// Set all the attributes
-			for ( var prop in options ) {
-				value = options[prop];
-
-				if ( isFunction ) {
-					value = value.call( elem, i );
+		} else {                              // Multiple attributes to set on all
+			options = name;
+			for ( var i = 0, l = this.length; i < l; i++ ) {
+				elem = this[i];
+				for ( name in options ) {
+					value = options[name];
+					if ( jQuery.isFunction(value) )
+						value = value.call(elem,i);
+					jQuery.attr( elem, name, value );
 				}
-
-				jQuery.attr( elem, prop, value );
 			}
 		}
 
@@ -258,4 +254,4 @@ jQuery.extend({
 		// Using attr for specific style information is now deprecated. Use style insead.
 		return jQuery.style(elem, name, value);
 	}
-});
+});
\ No newline at end of file

test/unit/attributes.js

@@ -68,12 +68,15 @@ test("attr(String, Function)", function() {
 });
 
 test("attr(Hash)", function() {
-	expect(1);
+	expect(3);
 	var pass = true;
 	jQuery("div").attr({foo: 'baz', zoo: 'ping'}).each(function(){
 		if ( this.getAttribute('foo') != "baz" && this.getAttribute('zoo') != "ping" ) pass = false;
 	});
 	ok( pass, "Set Multiple Attributes" );
+       equals( jQuery('#text1').attr({'value': function() { return this.id; }})[0].value, "text1", "Set attribute to computed value #1" );
+       equals( jQuery('#text1').attr({'title': function(i) { return i; }}).attr('title'), "0", "Set attribute to computed value #2");
+
 });
 
 test("attr(String, Object)", function() {
@@ -334,8 +337,8 @@ test("toggleClass(String|boolean|undefined[, boolean])", function() {
 	e.toggleClass(false);
 	e.toggleClass();
 	ok( e.is(".testD.testE"), "Assert class present (restored from data)" );
-	
-	
+
+
 
 	// Cleanup
 	e.removeClass("testD");