General javascript questions

I have the following scripts as examples, but I don’t really understand what they do. If someone could give me a brief explanation that would be great, thankyou. 

   1) countryDropdown.init(true, JSON.parse(‘@Html.Raw(Json.Encode(Model.CountryViewModel.Cities))’));

        $(document).ready(function() {
            initDatepicker.initDay($(‘.input-append.date’), true);
            loadFilterValues.load();
            initSelectPicker.init($(‘select[name=PeopleIds]’), ‘Any Person’);
        });
   
2) 
   
        $(document).ready(function() {
            $(‘.btnDelete’).click(function() {
                $(‘.btnConfirm’).attr(‘href’, $(‘.btnConfirm’).attr(‘href’) ‘?id=’ $(this).data(‘id’));
            });
        });
   
}
3) Also, in some areas I have seen references like ”
   
    ” referenced with no other code, does this actually do anything? Thanks in advance!