jQuery.data( object )

gistfile1.js

(function($){

	var expando = "jQuery" + (new Date).getTime(),
		hasOwnProperty = Object.prototype.hasOwnProperty,
		_data = $.data,
		_removeData = $.removeData;
	
	$.data = function( obj, name, data ) {
		if ( obj.nodeType ) {
			return _data( obj, name, data );
		}
		
		var thisCache, hasCache = hasOwnProperty.call( obj, expando );
		
		if ( !hasCache && typeof name === "string" && data === undefined ) {
			return undefined;
		}
			
		if ( typeof name === "object" ) {
			obj[ expando ] = $.extend(true, {}, name);
		
		} else if ( !hasCache ) {
			obj[ expando ] = {};
		}
		
		thisCache = obj[ expando ];
		
		if ( typeof name === "string" ) {
			if ( data !== undefined ) {
				thisCache[ name ] = data;
			}
			
			return thisCache[ name ];
		}
		
		return thisCache;
	};
	
	$.removeData = function( obj, name ) {
		if ( obj.nodeType ) {
			return _removeData( obj, name );
		}
		
		if ( name ) {
			if ( hasOwnProperty.call( obj, expando ) ) {
				delete obj[ expando ][ name ];
				
				if ( $.isEmptyObject( obj[expando] ) ) {
					delete obj[ expando ];
				}
			}
			
		} else {
			delete obj[ expando ];
		}
	};
	
})(jQuery);