直接从jQuery插件访问数据

Question

我正在尝试从插件中访问数据，并直接在其中一个插件选项/默认值中使用它。从来没有这样做过，我怎么能这样做？

;(function(root, factory){

    if(typeof define === 'function' && define.amd){
        define(['jquery'], factory);
    }else{
        factory(root.jQuery);
    }

}(this, function($){          

    var pluginName = 'somePlugin';

    function Plugin(element, options){

        this.obj = $(element);      
        this.o   = $.extend({}, $.fn[pluginName].defaults, options);

        this.init();
    };

    Plugin.prototype = {

        init: function(){ 

            // add a class to all elments with the class name 'wrap_div'
            $('.wrap_div').addClass('wrapped_div');

            // count the total of the newly added class(see below)
            var totalElements = $('wrapped_div').length;

            // for this example 
            alert( o.option_one );

        },  

        destroy: function(){ }      

    };

    $.fn[pluginName] = function(option, param) {
        return this.each(function() {
            var $this   = $(this);
            var data    = $this.data(pluginName);
            var options = typeof option == 'object' && option;
            if(!data){ 
              $this.data(pluginName, (data = new Plugin(this, options)))
            }
            if(typeof option == 'string'){
                 data[option](param);
            }
        });
    };

    $.fn[pluginName].defaults = {
        option_one: ''
    };

    $[pluginName] = function() {
        var $body = $(document.body);
        $body[pluginName].apply($body, arguments);
    }

}));


// call the plugin
$.somePlugin({
    option_one: totalElements// access the var for the plugin   
});