My code is not working (JQuery :Event Handlers project)

My code is not working despite i checked everything and still it is not working
$(document).ready( () => {

$(’.menu’).on(‘mouseenter’,() => {

$('.nav-menu').show();

});

$(’.nav-menu’).on(‘mouseleave’,() => {

$('.nav-menu').hide();

});

$(’.btn’).on(‘mouseenter’, (even) => {

$(event.currentTarget).addClasss(‘btn.hover’);

}).on(‘mouseleave’, (event) => {

$(event.currentTarget).removeClass('btn-hover');

});

$('.postText').on('keyup'), (event) => {

   let post = $(event.currentTarget).val();

   let remaining = 140 - post.length;

   if (remaining <=0) {

    $('.wordcount').addClass('red'); 

   } else {

     $('.wordcount').removeClass('red');

   }

   $('.characters').html(remaining);

 });

 $('.postText').focus();

});