javascript - jQuery animate odd behavior IE/Safari -

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i have code show , hide navbar @ top animation.

it's working fine chrome , firefox, not versions of ie (11, example) , safari: nav slides down automatically slides (hides) in loop.

i wonder if, solution in javascript, solved css.

it's wordpress site. html:

    <nav class="navbar navbar-default navbar-fixed-top" role="navigation">          <div class="container">             <div class="row">                 <div class="col-md-12">                      <div id="navbar-header-container">                         <div class="navbar-header">                      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">                             <span class="icon-bar"></span>                             <span class="icon-bar"></span>                             <span class="icon-bar"></span>                     </button>                                                       </div>                                            </div>                      <?php                      $args = array('theme_location' => 'primary',                                    'container_class' => 'navbar-collapse collapse',                                    'menu_class' => 'nav navbar-nav',                                   'fallback_cb' => '',                                   'menu_id' => 'main-menu',                                   'walker' => new upbootwp_walker_nav_menu());                      wp_nav_menu($args);                     ?>                 </div><!-- .col-md-12 -->             </div><!-- row -->         </div><!-- container -->     </nav>

and script:

$(function(){ var prevscroll = 0,   curdir = 'down',   prevdir = 'up';  $(window).scroll(function(){     if($(this).scrolltop() >= prevscroll){       curdir = 'down';       if(curdir != prevdir){       $('nav').stop();         $('nav').animate({ top: '-100px' }, 300);       prevdir = curdir;       }   } else {       curdir = 'up';       if(curdir != prevdir){       $('nav').stop();       $('nav').animate({ top: '0px' }, 300);       prevdir = curdir;       }   }   prevscroll = $(this).scrolltop(); }); })


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