jquery 下拉菜单

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如图片显示
2个菜单鼠标移到上面就会显示下拉菜单，而且子菜单还可以超链接，尽量写详细点，不要用插件来实现，尽量加注释，才接触jquery

<script type="text/javascript">
var timeoutId;
$(function ()

$("#menu li").each(function (index)

$(this).mouseover(function ()

timeoutId = setTimeout(function ()

//将所有样式为contentShow的移除
$("div.contentShow").removeClass("contentShow");
//将当前的显示
$("div.content:eq(" + index + ")").addClass("contentShow").css("margin-left", (index + 0.5) * 100 + "px");
, 300);
).mouseout(function ()

clearTimeout(timeoutId);
);
);
);
</script>
<style type="text/css">
div.contentclear:left;display:none;
div.contentShowdisplay:block;
atext-decoration:none;color:Black;
A:link COLOR: #00135b; text-decoration: none;
A:active COLOR: #00135b; text-decoration: none;
A:visited COLOR: #00135b; text-decoration: none;
A:hover COLOR: #ff8a00; text-decoration: none;
</style>
<div>
<ul id="menu" style="list-style:none;">
<li style=" float:left; margin:0px;cursor:pointer; width:100px; border:1px solid red;"> 一</li>
<li style=" float:left; margin:0px;cursor:pointer; width:100px; border:1px solid red;">二</li>
<li style=" float:left; margin:0px;cursor:pointer; width:100px; border:1px solid red;">三</li>
</ul>
<div style="margin-top:10px;">
<div class="content">
<ul style="list-style:none;">
<li style="width:100px; border:1px solid blue;"><a href="">一</a></li>
<li style="width:100px; border:1px solid blue;"><a href="">二</a></li>
<li style="width:100px; border:1px solid blue;"><a href="">三</a></li>
</ul>
</div>
<div class="content">
<ul style="list-style:none;">
<li style="width:100px; border:1px solid blue;"><a href="">df</a></li>
<li style="width:100px; border:1px solid blue;"><a href="">df</a></li>
<li style="width:100px; border:1px solid blue;"><a href="">df</a></li>
</ul>
</div>
<div class="content">
<ul style="list-style:none;">
<li style="width:100px; border:1px solid blue;"><a href="">43</a></li>
<li style="width:100px; border:1px solid blue;"><a href="">34</a></li>
<li style="width:100px; border:1px solid blue;"><a href="">34</a></li>
</ul>
</div>
</div>
</div> 参考技术A 效果是tab选取项卡的效果，要用js把它做出来。
<script language="javascript">
function tab(n)
for(i=0;i<3;i++)
document.getElementById("tab"+i).style.display="none";

documetn.getElementById("tab"+n).style.display="block";

</script>
<ul>
<li onmousemove="tab(0)">热点</li>
<li onmousemove="tab(1)">新闻</li>
<li onmousemove="tab(2)">活动</li>
</ul>
<div id="tab0" style="display:block;">
这里是热点模块内容
</div>
<div id="tab1" style="display:none;">
这里是新闻模块内容
</div>
<div id="tab2" style="display:none;">
这里是活动模块内容
</div>

Jquery 没有关闭下拉菜单

【中文标题】Jquery 没有关闭下拉菜单【英文标题】：Jquery is not closing drop-down 【发布时间】：2021-05-11 12:39:55 【问题描述】：

我正在使用 Bootstrap 导航栏构建多级（仅第二级）下拉菜单。我可以找到一个guide 来构建多级下拉菜单。

JSFiddle link

但是，下拉菜单不会在点击时关闭。点击Document可以关闭下拉菜单，我在jquery下面添加了。

$(document).click(function()
    $('.dropdown-menu').removeClass('show');
);

下拉菜单关闭，但在其他nav-item 中单击时，打开的下拉菜单不会关闭。所以，我缺少基本的JQuery。 基本上show 类在单击其他nav-item 时不会从.dropdown-menu 类中删除。所以，我想从.dropdown-menu 中删除show 类

编辑：我正在寻找工作 JS 或 Jquery 代码，上面的 Jquery 是从 staoverflow 复制的损坏代码。所以，寻找完整和干净的解决方案

$('.dropdown-menu a.dropdown-toggle').on('click', function(e) 
    if (!$(this).next().hasClass('show')) 
      $(this).parents('.dropdown-menu').first().find('.show').removeClass('show');
    
    var $subMenu = $(this).next('.dropdown-menu');
    $subMenu.toggleClass('show');
  
    return false;
  );

$(document).click(function() 
    //   $('.dropdown-menu').toggleClass('show');
$('.dropdown-menu').removeClass('show');
);

$('.dropdown').click(function(event)
  event.stopPropagation();
);
.dropdown-submenu 
    position: relative;
  
  
  .dropdown-submenu a::after 
    transform: rotate(-90deg);
    position: absolute;
    right: 6px;
    top: .8em;
  
  
  .dropdown-submenu .dropdown-menu 
    top: 0;
    left: 100%;
    margin-left: .1rem;
    margin-right: .1rem;
  
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/js/bootstrap.bundle.min.js" integrity="sha384-ygbV9kiqUc6oa4msXn9868pTtWMgiQaeYH7/t7LECLbyPA2x65Kgf80OJFdroafW" crossorigin="anonymous"></script>
<nav class="navbar navbar-expand-md navbar-dark bg-primary py-1">
        <div class="container-fluid">
        <div class="flex-row d-flex">         
            <a class="navbar-brand" href="#">Brand</a>
        </div>    
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button> 
<div class="navbar-collapse collapse" id="navbarSupportedContent">
            <ul class="navbar-nav">
                <li class="nav-item dropdown">
                  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                    Dogs
                  </a>
                  <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <li><a class="dropdown-item" href="#">Bulldog</a></li>
                    <li><a class="dropdown-item" href="#">Al</a></li>
                    <li><a class="dropdown-item" href="#">Labrador</a></li>
                    <li class="dropdown-submenu"><a class="dropdown-item dropdown-toggle" href="#">Puppies</a>
                        <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">Husky</a></li>
                            <li><a class="dropdown-item" href="#">Husky B</a></li>
                            <li><a class="dropdown-item" href="#">Husky C</a></li>
                          </ul>
                    </li>
                    <li class="dropdown-submenu"><a class="dropdown-item dropdown-toggle" href="#">Pet Products</a>
                        <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">Cat</a></li>
                            <li><a class="dropdown-item" href="#">Dogs</a></li>
                            <li><a class="dropdown-item" href="#">Reptile</a></li>
                            <li><a class="dropdown-item" href="#">Amphibian</a></li>
                          </ul>
                    </li>
                  </ul>
                </li>
                  <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                      Pet Cages
                    </a>
                    <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                      <li><a class="dropdown-item" href="#">Cat</a></li>
                      <li><a class="dropdown-item" href="#">Dogs</a></li>
                      <li><a class="dropdown-item" href="#">Reptile</a></li>
                    </ul>
                  </li>
                  <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                      Pet Guides
                    </a>
                    <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                      <li><a class="dropdown-item" href="#">Labrador</a></li>
                      <li><a class="dropdown-item" href="#">Cat</a></li>
                      <li><a class="dropdown-item" href="#">Lizard</a></li>
                    </ul>
                  </li>
                  <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                      ML & AI
                    </a>
                    <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                      <li><a class="dropdown-item" href="#">Pet CBD</a></li>                      
                    </ul>
                  </li>
                <!-- <form class="d-flex"> -->
                    <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
                    <!-- <button class="btn btn-outline-success" type="submit">Search</button> -->
                  <!-- </form> -->
              </ul>
        </div>
        </div>
        </nav>

【问题讨论】：

@user1735921 在父元素#navbarSupportedContent的类列表中添加show 当我点击其他导航项时它会为我关闭。 如果您不使用其他编辑器，请在 JSFiddle 中尝试 @munna01 您在问题中的完整示例代码集应该完全重现您的问题。在 Chrome 中进行测试，这个 sn-p 似乎可以正常工作。请在该特定代码集中提供有关您的问题的更多详细信息或特定信息，作为您实际问题的一部分。 （不是小提琴，这里是这个） @MarkSchultheiss 请检查，我已经添加了 gif 截图（解释问题 - “狗下拉菜单应该关闭点击宠物笼下拉菜单” 【参考方案1】：

对于 持久性打开的 DROPWON 的主要问题，您可以通过侦听 nav-link 事件 show.bs.dropdown 来解决该问题，然后从 .dropdown 包装的 .dropdown-submenu 中删除 show 类

如下：

$('.nav-link').on('show.bs.dropdown', function(e) 
  $(".dropdown-submenu .dropdown-menu").removeClass("show");
);

请参阅下面的工作 sn-p ：（也可以全屏尝试）

为了测试，我从 sn-p 中删除了一些菜单：

$('.dropdown-menu a.dropdown-toggle').on('click', function(e) 
  if (!$(this).next().hasClass('show')) 
    $(this).parents('.dropdown-menu').first().find('.show').removeClass('show');
  
  var $subMenu = $(this).next('.dropdown-menu');
  $subMenu.toggleClass('show');

  return false;
);


$('.nav-link').on('show.bs.dropdown', function(e) 
  $(".dropdown-submenu .dropdown-menu").removeClass("show");
);

$(document).on("click", ".nav-link", function(e)
  console.log("clicl nav");
)

$('.dropdown').click(function(event) 
  console.log("click");
  event.stopPropagation();
);
.dropdown-submenu 
  position: relative;


.dropdown-submenu a::after 
  transform: rotate(-90deg);
  position: absolute;
  right: 6px;
  top: .8em;


.dropdown-submenu .dropdown-menu 
  top: 0;
  left: 100%;
  margin-left: .1rem;
  margin-right: .1rem;

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/js/bootstrap.bundle.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" />
<nav class="navbar navbar-expand-md navbar-dark bg-primary py-1">
  <div class="container-fluid">
    <div class="flex-row d-flex">
      <a class="navbar-brand" href="#">Brand</a>
    </div>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
    <div class="navbar-collapse collapse" id="navbarSupportedContent">
      <ul class="navbar-nav">
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                    Dogs
                  </a>
          <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
            <li><a class="dropdown-item" href="#">Bulldog</a></li>
            <li><a class="dropdown-item" href="#">Al</a></li>
            <li><a class="dropdown-item" href="#">Labrador</a></li>
            <li class="dropdown-submenu"><a class="dropdown-item dropdown-toggle" href="#">Puppies</a>
              <ul class="dropdown-menu">
                <li><a class="dropdown-item" href="#">Husky</a></li>
                <li><a class="dropdown-item" href="#">Husky B</a></li>
                <li><a class="dropdown-item" href="#">Husky C</a></li>
              </ul>
            </li>
            <li class="dropdown-submenu"><a class="dropdown-item dropdown-toggle" href="#">Pet Products</a>
              <ul class="dropdown-menu">
                <li><a class="dropdown-item" href="#">Cat</a></li>
                <li><a class="dropdown-item" href="#">Dogs</a></li>
                <li><a class="dropdown-item" href="#">Reptile</a></li>
                <li><a class="dropdown-item" href="#">Amphibian</a></li>
              </ul>
            </li>
          </ul>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                      Pet Cages
                    </a>
          <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
            <li><a class="dropdown-item" href="#">Cat</a></li>
            <li><a class="dropdown-item" href="#">Dogs</a></li>
            <li><a class="dropdown-item" href="#">Reptile</a></li>
          </ul>
        </li>
        <!-- <button class="btn btn-outline-success" type="submit">Search</button> -->
        <!-- </form> -->
      </ul>
    </div>
  </div>
</nav>

【讨论】：

@munna01，你能准确描述一下你需要什么吗？单击外部时关闭下拉菜单？ 是的。点击甚至其他导航链接，应该关闭以前打开的导航（side-nav）s 能否请您调查一下 - 这个问题，提出了新问题：***.com/questions/66098848/… @munna01 ，更新了我的答案，我想现在我可以理解你的问题了（在看到屏幕记录 gif 之后） 是我的错误，我不能写得更好来说服你。可能是我英语不好（是这个原因）【参考方案2】：

您无需添加jQuery 即可实现此目的。 删除jQuery 和额外的javascript 代码，您的下拉菜单将通过添加一个简单的css 代码来工作。

        .dropdown-submenu 
            position: relative;
        
        
        .dropdown-submenu > .dropdown-menu 
            top: 0;
            left: 100%;
            margin-top: -6px;
            margin-left: -1px;
            -webkit-border-radius: 0 6px 6px 6px;
            -moz-border-radius: 0 6px 6px;
            border-radius: 0 6px 6px 6px;
        
        
        .dropdown-submenu:hover > .dropdown-menu 
            display: block;
        
        
        .dropdown-submenu>a : after 
            display: block;
            content: " ";
            float: right;
            width: 0;
            height: 0;
            border-color: transparent;
            border-style: solid;
            border-width: 5px 0 5px 5px;
            border-left-color: #ccc;
            margin-top: 5px;
            margin-right: -10px;
        
        
        .dropdown-submenu:hover > a : after 
            border-left-color: #fff;
        
        
        .dropdown-submenu.pull-left 
            float: none;
        
        
        .dropdown-submenu.pull-left > .dropdown-menu 
            left: -100%;
            margin-left: 10px;
            -webkit-border-radius: 6px 0 6px 6px;
            -moz-border-radius: 6px 0 6px 6px;
            border-radius: 6px 0 6px 6px;
        
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/js/bootstrap.bundle.min.js" integrity="sha384-ygbV9kiqUc6oa4msXn9868pTtWMgiQaeYH7/t7LECLbyPA2x65Kgf80OJFdroafW" crossorigin="anonymous"></script>
<nav class="navbar navbar-expand-md navbar-dark bg-primary py-1">
        <div class="container-fluid">
        <div class="flex-row d-flex">         
            <a class="navbar-brand" href="#">Brand</a>
        </div>    
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button> 
<div class="navbar-collapse collapse" id="navbarSupportedContent">
            <ul class="navbar-nav">
                <li class="nav-item dropdown">
                  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                    Dogs
                  </a>
                  <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <li><a class="dropdown-item" href="#">Bulldog</a></li>
                    <li><a class="dropdown-item" href="#">Al</a></li>
                    <li><a class="dropdown-item" href="#">Labrador</a></li>
                    <li class="dropdown-submenu"><a class="dropdown-item dropdown-toggle" href="#">Puppies</a>
                        <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">Husky</a></li>
                            <li><a class="dropdown-item" href="#">Husky B</a></li>
                            <li><a class="dropdown-item" href="#">Husky C</a></li>
                          </ul>
                    </li>
                    <li class="dropdown-submenu"><a class="dropdown-item dropdown-toggle" href="#">Pet Products</a>
                        <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">Cat</a></li>
                            <li><a class="dropdown-item" href="#">Dogs</a></li>
                            <li><a class="dropdown-item" href="#">Reptile</a></li>
                            <li><a class="dropdown-item" href="#">Amphibian</a></li>
                          </ul>
                    </li>
                  </ul>
                </li>
                  <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                      Pet Cages
                    </a>
                    <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                      <li><a class="dropdown-item" href="#">Cat</a></li>
                      <li><a class="dropdown-item" href="#">Dogs</a></li>
                      <li><a class="dropdown-item" href="#">Reptile</a></li>
                    </ul>
                  </li>
                  <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                      Pet Guides
                    </a>
                    <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                      <li><a class="dropdown-item" href="#">Labrador</a></li>
                      <li><a class="dropdown-item" href="#">Cat</a></li>
                      <li><a class="dropdown-item" href="#">Lizard</a></li>
                    </ul>
                  </li>
                  <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                      ML & AI
                    </a>
                    <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                      <li><a class="dropdown-item" href="#">Pet CBD</a></li>                      
                    </ul>
                  </li>
                <!-- <form class="d-flex"> -->
                    <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
                    <!-- <button class="btn btn-outline-success" type="submit">Search</button> -->
                  <!-- </form> -->
              </ul>
        </div>
        </div>
        </nav>

【讨论】：

不能接受悬停，这会破坏移动网站。

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