最简单的解决方案是CSS。加上一些像……

.dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0; /* remove the gap so it doesn't close */
}

工作小提琴

尝试使用带有淡出淡出动画的悬停功能

$('ul.nav li.dropdown').hover(function() {
  $(this).find('.dropdown-menu').stop(true, true).delay(200).fadeIn(500);
}, function() {
  $(this).find('.dropdown-menu').stop(true, true).delay(200).fadeOut(500);
});

这是我使用jQuery使它下拉悬停

$(document).ready(function () {
    $('.navbar-default .navbar-nav > li.dropdown').hover(function () {
        $('ul.dropdown-menu', this).stop(true, true).slideDown('fast');
        $(this).addClass('open');
    }, function () {
        $('ul.dropdown-menu', this).stop(true, true).slideUp('fast');
        $(this).removeClass('open');
    });
});

最简单的解决方案是CSS。加上一些像……

.dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0; /* remove the gap so it doesn't close */
}

工作小提琴

对于CSS来说，当你点击它的时候，它会变得疯狂。这是我正在使用的代码，它也没有改变任何移动视图。

$('.dropdown').mouseenter(function(){
    if(!$('.navbar-toggle').is(':visible')) { // disable for mobile view
        if(!$(this).hasClass('open')) { // Keeps it open when hover it again
            $('.dropdown-toggle', this).trigger('click');
        }
    }
});

测试和工作良好

<nav class="dnt_show_mbl navbar navbar-default navbar-fixed-top" >
  <div class="container" style="width:100%;">
    <div class="navbar-header" style="height:90px;">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>                        
      </button>

      <a class="navbar-brand dnt_show_mbl" href="index.html" style="margin-left:100%;margin-top:2%;">
        <img src="material/logo.png" width="160px;" alt="visoka">
      </a>
      <a class="navbar-brand dontdisplaylg" href="index.html" style="" alt="visoka">
        <img src="material/logo.png" width="200px;">
      </a>

    </div>

    <div class="collapse navbar-collapse" id="myNavbar" style="background-color: #fff;border-color:#fff;">
      <ul class="nav navbar-nav navbar-right" style="margin-top: 4px;margin-right: 180px;padding:15px;letter-spacing:1px;color:#000;">

        <li><a href="index.html" style="font-family: Inter !important;">HOME</a></li>
        <li><a href="About-Us.html" style="font-family: Inter !important;">ABOUT US</a></li>

        <li class="dropdown-header" style="margin-top:-3px;margin-left:-3%;" onmouseout="out_menu();" onmouseover="on_menu();">
        <a style="font-family: Inter !important;" class="dropdown-toggle" href="Projects.html">PROJECTS
        <span class="caret"></span></a>
        <ul class="dropdown-menu">
          <li><a href="Projects.html#ongoing" style="font-family: Inter !important;">Ongoing Projects</a></li><br>
          <li><a href="Projects.html#completed" style="font-family: Inter !important;">Completed Projects</a></li><br>
          <li><a href="Projects.html#upcoming" style="font-family: Inter !important;">Upcoming Projects</a></li>
        </ul>
      </li>
      </ul>
    </div>
  </div>
</nav>

  <script>
function on_menu(){
$(".dropdown-header:first").addClass("open");
}

function out_menu(){
$(".dropdown-header:first").removeClass("open");
}
</script>