drupal 7 custom javascript js

drupal_7_custom.js

/**
 * @file
 * main.js
 *
 * Provides general enhancements and js functionalities.
 */

var Drupal = Drupal || {};
(function ($,Drupal) {
  Drupal.behaviors.exampleModule = {
    attach: function (context, settings) {
      $('.example', context).click(function () {
        $(this).next('ul').toggle('show');
      });
    }
  };


})(jQuery,Drupal);