从外部修改jQuery插件功能

Question

我正在使用iThemes Exchange for WordPress，而我正在尝试修改控制iThemes Exchange购物车结帐流程某些方面的javascript文件。

问题是我无法修改插件本身，因为当客户端更新其插件时，任何更改都将被覆盖。因此，我尝试修改javascript插件的updateStates()功能，以便国家/地区标签自动设置为＆＃34;美国＆＃34;。

我尝试使用插件所在的jQuery.fn.itCountryStatesSync修改插件，但我一定做错了。如果有帮助，我会包含插件的javascript文件。

/**
 * jQuery Country States Sync Plugin by iThemes
 * Plugin framework via <http://coding.smashingmagazine.com/2011/10/11/essential-jquery-plugin-patterns/>
*/
;(function ( $, window, document, undefined ) {
    // Create the defaults once
    var pluginName = 'itCountryStatesSync',
        defaults   = {
            stateWrapper      : '.it-exchange-state',
            stateFieldID      : '#it-exchange-address-state',
            action            : 'ite-country-states-update',
            templatePart      : '',
            clearTextValue    : false,
            ajaxUrl           : itExchangeAjaxCountryStatesAjaxURL,
            adminPrefix       : false,
            autoCompleteState : false,
            autoFocusState    : false
        };

    // The actual plugin constructor
    function Plugin( countrySelectElement, options ) {

        // Set element
        this.element = countrySelectElement;

        // jQuery has an extend method that merges the
        // contents of two or more objects, storing the
        // result in the first object. The first object
        // is generally empty because we don't want to alter
        // the default options for future instances of the plugin
        this.options = $.extend( {}, defaults, options) ;

        // Country Field ID
        this.options.countryFieldID = '#' + $(this.element).attr('id');

        this._defaults = defaults;
        this._name     = pluginName;

        this.init();
    }

    Plugin.prototype.init = function () {
        // Place initialization logic here
        // You already have access to the DOM element and
        // the options via the instance, e.g. this.element
        // and this.options

        $(this.element).on('change', this.options, this.updateStates );
    };

    Plugin.prototype.updateStates = function( event ) {

        var iteCountryStatesSyncPostData = {};

        iteCountryStatesSyncPostData.ite_base_country_ajax  = $(event.data.countryFieldID).val();
        iteCountryStatesSyncPostData.ite_base_state_ajax    = $(event.data.stateFieldID).val();
        iteCountryStatesSyncPostData.ite_state_name_ajax    = $(event.data.stateFieldID).attr('name');
        iteCountryStatesSyncPostData.ite_action_ajax        = event.data.action;
        iteCountryStatesSyncPostData.ite_template_part_ajax = event.data.templatePart;
        iteCountryStatesSyncPostData.ite_admin_prefix_ajax  = event.data.adminPrefix;
        iteCountryStatesSyncPostData.ite_clearTextValue     = event.data.clearTextValue;

        $.post(event.data.ajaxUrl, iteCountryStatesSyncPostData, function(response) {
            if (response) {
                var parentForm = $(event.data.countryFieldID).closest('form');
                $(event.data.stateWrapper, parentForm).html(response);
                if (event.data.autoCompleteState)
                    $(event.data.stateFieldID).filter('select').selectToAutocomplete();
                if (event.data.autoFocusState) {
                    if ( $(event.data.stateWrapper).children('.ui-autocomplete-input').length !== 0 ) {
                        $(event.data.stateWrapper).children('.ui-autocomplete-input').focus();
                    } else {
                        $(event.data.stateFieldID).focus();
                    }
                }
            }
        });
    }

    // A really lightweight plugin wrapper around the constructor,
    // preventing against multiple instantiations
    $.fn[pluginName] = function ( options ) {
        return this.each(function () {
            if (!$.data(this, 'plugin_' + pluginName)) {
                $.data(this, 'plugin_' + pluginName,
                new Plugin( this, options ));
            }
        });
    }

})( jQuery, window, document );