悬停下拉菜单 jquery

Question

当我将鼠标悬停在主菜单上时，请帮助我解决以下错误，子菜单下拉菜单不会显示。

HTML 如下所示：

<li class="dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown" 
              role="button" aria-expanded="false">
        Page<span class="caret"></span>
    </a>
    <ul class="dropdown-menu" role="menu">
      <li><a href="404.html">404 Page</a></li>
      <li><a href="#">Link Two</a></li>
      <li><a href="#">Link Three</a></li>               
    </ul>
</li>

Javascript代码如下：

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

Answer 1

$(document).ready(function() {
    $( '.dropdown' ).hover(
        function(){
            $(this).children('.dropdown-menu').slideDown(200);
        },
        function(){
            $(this).children('.dropdown-menu').slideUp(200);
        }
    );
}); // end ready

.dropdown-menu {
  display:none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<li class="dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown" 
              role="button" aria-expanded="false">
        Page<span class="caret"></span>
    </a>
    <ul class="dropdown-menu" role="menu">
      <li><a href="404.html">404 Page</a></li>
      <li><a href="#">Link Two</a></li>
      <li><a href="#">Link Three</a></li>               
    </ul>
</li>