问如何使用getter方法实现jQuery插件？

EN

$.fn.myVersatilePlugin = function (options, values) {
    if (values === undefined) {
        //do something to element with given `values`
        return this; // <-- chainability
    } else {
        values = {};
        // do whatever it is you do to get what you want to return
        return values; // and return it
    }
};

var pluginName = 'tagger';

//
// Plugin wrapper around the constructor,
// preventing against multiple instantiations and allowing any
// public function (whose name doesn't start with an underscore) to be 
// called via the jQuery plugin:
// e.g. $(element).defaultPluginName('functionName', arg1, arg2)
//
$.fn[pluginName] = function(options) {
    var args = arguments;

    if (options === undefined || typeof options === 'object') {
        // Create a plugin instance for each selected element.
        return this.each(function() {
            if (!$.data(this, 'plugin_' + pluginName)) {
                $.data(this, 'plugin_' + pluginName, new Plugin(this, options));
            }
        });
    } else if (typeof options === 'string' && options[0] !== '_' && options !== 'init') {
        // Call a pluguin method for each selected element.
        if (Array.prototype.slice.call(args, 1).length == 0 && $.inArray(options, $.fn[pluginName].getters) != -1) {
            // If the user does not pass any arguments and the method allows to
            // work as a getter then break the chainability
            var instance = $.data(this[0], 'plugin_' + pluginName);
            return instance[options].apply(instance, Array.prototype.slice.call(args, 1));
        } else {
            // Invoke the speficied method on each selected element
            return this.each(function() {
                var instance = $.data(this, 'plugin_' + pluginName);
                if (instance instanceof Plugin && typeof instance[options] === 'function') {
                    instance[options].apply(instance, Array.prototype.slice.call(args, 1));
                }
            });
        }
    }
};

//
// Names of the pluguin methods that can act as a getter method.
//
$.fn[pluginName].getters = ['tags'];