不能同时使用ajax POST和jquery动画(使用引导)

Bootstrap Template 它有一个侧栏,当用户单击 .nav-menu

$(document).ready(function () {

    $( '.nav-menu' ).click(function() {
         event.preventDefault();
         if($( '.nav-menu-item' ).is(":visible")){
              $('.nav-menu-item' ).hide('slide', {direction:'left'}, 1000);
              $('#menu-item-container').addClass('sidebar-hidden');
         } else{
              $('.nav-menu-item' ).show('slide', {direction:'left'}, 1000);
              $('#menu-item-container').removeClass('sidebar-hidden');  
         }
    });
});

上面的代码运行良好。

当我尝试包含一篇ajax文章时,问题就出现了,如下所示:

$(document).ready(function () {

    $( '.nav-menu' ).click(function() {
         event.preventDefault();
         if($( '.nav-menu-item' ).is(":visible")){
              $('.nav-menu-item' ).hide('slide', {direction:'left'}, 1000);
              $('#menu-item-container').addClass('sidebar-hidden');

              $.ajax({
                url:'/userSettings',
                type:'POST',
                data:{'sidebar':'0'}
              });


         } else{
              $('.nav-menu-item' ).show('slide', {direction:'left'}, 1000);
              $('#menu-item-container').removeClass('sidebar-hidden'); 

              $.ajax({
                url:'/userSettings',
                type:'POST',
                data:{'sidebar':'1'}
              });

         }
    });
});

this 在我的public/js文件夹中,并在页脚中添加了以下内容:

<script type="text/javascript" src="js/jquery-3.3.1.js"></script>

现在ajax帖子工作正常(除了我必须双击 )但是“显示/隐藏”动画无法正常工作!

这 $('.nav-menu-item' ).hide('slide', {direction:'left'}, 1000);

这是Chrome控制台中的错误(其中有7270个):

jquery-3.3.1.js:6710 Uncaught TypeError: jQuery.easing[this.easing] is not a function
    at init.run (jquery-3.3.1.js:6710)
    at tick (jquery-3.3.1.js:7094)
    at Function.jQuery.fx.tick (jquery-3.3.1.js:7436)
    at schedule (jquery-3.3.1.js:6813)

不确定这是否相关,但这是整个页脚:

//bootstrap required
<script src="https://cdnjs.cloudflare.com/ajax/libs/feather-icons/4.9.0/feather.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
//bootstrap required

<script type="text/javascript" src="js/jquery-3.3.1.js"></script>
<script src="js/dashboard.js"></script>
<script src="js/jquery.js"></script>
</body>
</html>