下拉菜单没有显示无

分类：编程问答

如何解决下拉菜单没有显示无

我正在尝试创建一个wistia.com之类的下拉菜单。但是我无法获得这种悬停效果。我将代码放在下面的代码段中。当我将鼠标悬停在主菜单链接上时，将出现下拉菜单。当我将鼠标悬停在下拉列表之外时，它应该消失了。现在，它仅在我将鼠标悬停在菜单上时显示，而在我离开菜单时不会隐藏。

let dropdown = document.querySelector(".dropdown");
let chevron = document.querySelector(".main-link i");

function dropdownDisplay() {
  dropdown.style.display = "flex";
}
function dropdownHide() {
  dropdown.style.display = "none";
}
function chevronTransition() {
  chevron.style.trasform = "rotateX(0deg)";
}
:root {
  --font1: roboto;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
nav {
  width: 100%;
  height: 70px;
  border-bottom: 1px solid #ddd;
  font-family: var(--font1);
}
nav .container {
  width: 1340px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}
nav .container .links {
  display: flex;
  align-items: center;
}
nav .container .links .menu {
  margin-left: 32px;
}
nav .container .links .menu ul .main-link {
  list-style: none;
  display: inline-block;
  margin-right: 24px;
  cursor: pointer;
}
nav .container .links .menu ul .main-link:hover i {
  transform: rotateX(180deg);
}
nav .container .links .menu ul .main-link .dropdown {
  width: 1340px;
  position: absolute;
  top: 100%;
  left: 0;
  padding: 32px 0;
  cursor: initial;
  display: none;
  border-bottom: 1px solid #ddd;
}
nav .container .links .menu ul .main-link .dropdown .cta {
  width: 300px;
  padding-right: 16px;
}
nav .container .links .menu ul .main-link .dropdown .cta h4 {
  color: #3ea9f5;
  font-size: 30px;
}
nav .container .links .menu ul .main-link .dropdown .cta p {
  color: #505050;
  margin-bottom: 32px;
  margin-top: 24px;
}
nav .container .links .menu ul .main-link .dropdown .cta a {
  color: #fff;
  background-color: #3ea9f5;
  padding: 12px 32px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
}
nav .container .links .menu ul .main-link .dropdown .cta a:focus {
  outline: none;
}
nav .container .links .menu ul .main-link .dropdown .major {
  width: 150px;
}
nav .container .links .menu ul .main-link .dropdown .major ul li {
  display: block;
  margin-bottom: 8px;
}
nav .container .links .menu ul .main-link .dropdown .major ul li a {
  color: #505050;
  font-weight: 700;
  text-decoration: none;
}
nav .container .links .menu ul .main-link .dropdown .sub-menu-links {
  display: flex;
}
nav .container .links .menu ul .main-link .dropdown .sub-menu-links .sub-menu {
  margin-right: 20px;
  width: 150px;
}
nav
  .container
  .links
  .menu
  ul
  .main-link
  .dropdown
  .sub-menu-links
  .sub-menu
  h6 {
  font-weight: bold;
  color: #a7afba;
  font-size: 14px;
  margin-bottom: 12px;
}
nav
  .container
  .links
  .menu
  ul
  .main-link
  .dropdown
  .sub-menu-links
  .sub-menu
  ul
  li {
  display: block;
  list-style: none;
  margin-bottom: 8px;
}
nav
  .container
  .links
  .menu
  ul
  .main-link
  .dropdown
  .sub-menu-links
  .sub-menu
  ul
  li
  a {
  font-size: 15px;
  text-decoration: none;
  color: #505050;
}
nav .container .links .menu ul .main-link i {
  font-size: 12px;
}
nav .container .links .logo h3 {
  font-size: 36px;
}
<nav>
      <div class="container">
        <div class="links">
          <div class="logo">
            <h3>WISTIA</h3>
          </div>
          <div class="menu">
            <ul>
              <li
                class="main-link"
                onmouseenter="dropdownDisplay()"
                onmouseout="chevronTransition()"
              >
                Product <i class="fas fa-chevron-down"></i>
                <div class="dropdown">
                  <div class="cta">
                    <h4>Product</h4>
                    <p>
                      Use our software and your videos to grow your business.
                    </p>
                    <a href="#">Start for free</a>
                  </div>
                  <div class="major">
                    <ul>
                      <li><a href="#">Features</a></li>
                      <li><a href="#">Pricing</a></li>
                      <li><a href="#">Integration</a></li>
                    </ul>
                  </div>
                  <div class="sub-menu-links">
                    <div class="sub-menu">
                      <h6>CREATE</h6>
                      <ul>
                        <li><a href="#">Recording</a></li>
                        <li><a href="#">Hosting</a></li>
                        <li><a href="#">Collaboration</a></li>
                        <li><a href="#">Management</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>PRESENT</h6>
                      <ul>
                        <li><a href="#">Player</a></li>
                        <li><a href="#">Embedding</a></li>
                        <li><a href="#">Interactivity</a></li>
                        <li><a href="#">Channels</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>GROW</h6>
                      <ul>
                        <li><a href="#">SEO</a></li>
                        <li><a href="#">Subscribers</a></li>
                        <li><a href="#">Reach & retarget</a></li>
                        <li><a href="#">Analytics</a></li>
                      </ul>
                    </div>
                  </div>
                </div>
              </li>
              <li class="main-link">
                Learning Center <i class="fas fa-chevron-down"></i>
              </li>
              <li class="main-link">
                Podcasts & Series <i class="fas fa-chevron-down"></i>
              </li>
              <li class="main-link">
                About <i class="fas fa-chevron-down"></i>
              </li>
            </ul>
          </div>
        </div>
        <div class="buttons">
          <a href="#">Sign In</a>
          <a href="#">Get Started</a>
        </div>
      </div>
    </nav>

解决方法

您尚未为下拉菜单添加悬停状态。您必须添加

nav .container .links .menu ul .main-link:hover .dropdown {
  display: block;
}
,

添加mouseover和mouseout事件：

all keys and values in first iteration,addressOne = null in the second iteration,addressTwo = null in the third iteration,cityCode  = null in fourth iteration,
let dropdown = document.querySelector(".dropdown");
let chevron = document.querySelector(".main-link i");

function dropdownDisplay() {
  dropdown.style.display = "flex";
}

function dropdownHide() {
  dropdown.style.display = "none";
}

function chevronTransition() {
  chevron.style.trasform = "rotateX(0deg)";
}


document.querySelector('#product-link').addEventListener("mouseover",() => {
  dropdownDisplay();
});

document.querySelector('#product-link').addEventListener("mouseout",() => {
  dropdownHide();
});
:root {
  --font1: roboto;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

nav {
  width: 100%;
  height: 70px;
  border-bottom: 1px solid #ddd;
  font-family: var(--font1);
}

nav .container {
  width: 1340px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

nav .container .links {
  display: flex;
  align-items: center;
}

nav .container .links .menu {
  margin-left: 32px;
}

nav .container .links .menu ul .main-link {
  list-style: none;
  display: inline-block;
  margin-right: 24px;
  cursor: pointer;
}

nav .container .links .menu ul .main-link:hover i {
  transform: rotateX(180deg);
}

nav .container .links .menu ul .main-link .dropdown {
  width: 1340px;
  position: absolute;
  top: 100%;
  left: 0;
  padding: 32px 0;
  cursor: initial;
  display: none;
  border-bottom: 1px solid #ddd;
}

nav .container .links .menu ul .main-link .dropdown .cta {
  width: 300px;
  padding-right: 16px;
}

nav .container .links .menu ul .main-link .dropdown .cta h4 {
  color: #3ea9f5;
  font-size: 30px;
}

nav .container .links .menu ul .main-link .dropdown .cta p {
  color: #505050;
  margin-bottom: 32px;
  margin-top: 24px;
}

nav .container .links .menu ul .main-link .dropdown .cta a {
  color: #fff;
  background-color: #3ea9f5;
  padding: 12px 32px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
}

nav .container .links .menu ul .main-link .dropdown .cta a:focus {
  outline: none;
}

nav .container .links .menu ul .main-link .dropdown .major {
  width: 150px;
}

nav .container .links .menu ul .main-link .dropdown .major ul li {
  display: block;
  margin-bottom: 8px;
}

nav .container .links .menu ul .main-link .dropdown .major ul li a {
  color: #505050;
  font-weight: 700;
  text-decoration: none;
}

nav .container .links .menu ul .main-link .dropdown .sub-menu-links {
  display: flex;
}

nav .container .links .menu ul .main-link .dropdown .sub-menu-links .sub-menu {
  margin-right: 20px;
  width: 150px;
}

nav .container .links .menu ul .main-link .dropdown .sub-menu-links .sub-menu h6 {
  font-weight: bold;
  color: #a7afba;
  font-size: 14px;
  margin-bottom: 12px;
}

nav .container .links .menu ul .main-link .dropdown .sub-menu-links .sub-menu ul li {
  display: block;
  list-style: none;
  margin-bottom: 8px;
}

nav .container .links .menu ul .main-link .dropdown .sub-menu-links .sub-menu ul li a {
  font-size: 15px;
  text-decoration: none;
  color: #505050;
}

nav .container .links .menu ul .main-link i {
  font-size: 12px;
}

nav .container .links .logo h3 {
  font-size: 36px;
}

,

仅需CSS即可完成 要在下拉菜单中更改图标（人字形）。

nav .container .links .menu ul .main-link:hover i {
  transform: rotateX(180deg);
}
nav .container .links .menu ul .main-link i {
  transform: rotateX(0deg);
}

要悬停显示下拉菜单内容

nav .container .links .menu ul .main-link:hover .dropdown {
  display: flex;
}
nav .container .links .menu ul .main-link .dropdown {
   display: none;
}


:root {
  --font1: roboto;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
nav {
  width: 100%;
  height: 70px;
  border-bottom: 1px solid #ddd;
  font-family: var(--font1);
}
nav .container {
  width: 1340px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}
nav .container .links {
  display: flex;
  align-items: center;
}
nav .container .links .menu {
  margin-left: 32px;
}
nav .container .links .menu ul .main-link {
  list-style: none;
  display: inline-block;
  margin-right: 24px;
  cursor: pointer;
}
nav .container .links .menu ul .main-link:hover i {
  transform: rotateX(180deg);
}
nav .container .links .menu ul .main-link i {
  transform: rotateX(0deg);
}
nav .container .links .menu ul .main-link .dropdown {
  width: 1340px;
  position: absolute;
  top: 100%;
  left: 0;
  padding: 32px 0;
  cursor: initial;
  display: none;
  border-bottom: 1px solid #ddd;
}
nav .container .links .menu ul .main-link:hover .dropdown {
  display: flex;
}
nav .container .links .menu ul .main-link .dropdown .cta {
  width: 300px;
  padding-right: 16px;
}
nav .container .links .menu ul .main-link .dropdown .cta h4 {
  color: #3ea9f5;
  font-size: 30px;
}
nav .container .links .menu ul .main-link .dropdown .cta p {
  color: #505050;
  margin-bottom: 32px;
  margin-top: 24px;
}
nav .container .links .menu ul .main-link .dropdown .cta a {
  color: #fff;
  background-color: #3ea9f5;
  padding: 12px 32px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
}
nav .container .links .menu ul .main-link .dropdown .cta a:focus {
  outline: none;
}
nav .container .links .menu ul .main-link .dropdown .major {
  width: 150px;
}
nav .container .links .menu ul .main-link .dropdown .major ul li {
  display: block;
  margin-bottom: 8px;
}
nav .container .links .menu ul .main-link .dropdown .major ul li a {
  color: #505050;
  font-weight: 700;
  text-decoration: none;
}
nav .container .links .menu ul .main-link .dropdown .sub-menu-links {
  display: flex;
}
nav .container .links .menu ul .main-link .dropdown .sub-menu-links .sub-menu {
  margin-right: 20px;
  width: 150px;
}
nav
  .container
  .links
  .menu
  ul
  .main-link
  .dropdown
  .sub-menu-links
  .sub-menu
  h6 {
  font-weight: bold;
  color: #a7afba;
  font-size: 14px;
  margin-bottom: 12px;
}
nav
  .container
  .links
  .menu
  ul
  .main-link
  .dropdown
  .sub-menu-links
  .sub-menu
  ul
  li {
  display: block;
  list-style: none;
  margin-bottom: 8px;
}
nav
  .container
  .links
  .menu
  ul
  .main-link
  .dropdown
  .sub-menu-links
  .sub-menu
  ul
  li
  a {
  font-size: 15px;
  text-decoration: none;
  color: #505050;
}
nav .container .links .menu ul .main-link i {
  font-size: 12px;
}
nav .container .links .logo h3 {
  font-size: 36px;
}
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width,initial-scale=1.0" />
    <title>Navbar wistia</title>
    <link rel="stylesheet" href="style.css" />
    <script
      src="https://kit.fontawesome.com/7e5d687fd9.js"
      crossorigin="anonymous"
    ></script>
  </head>
  <body>
    <nav>
      <div class="container">
        <div class="links">
          <div class="logo">
            <h3>WISTIA</h3>
          </div>
          <div class="menu">
            <ul>
              <li
                class="main-link"
              >
                Product <i class="fas fa-chevron-down"></i>
                <div class="dropdown">
                  <div class="cta">
                    <h4>Product</h4>
                    <p>
                      Use our software and your videos to grow your business.
                    </p>
                    <a href="#">Start for free</a>
                  </div>
                  <div class="major">
                    <ul>
                      <li><a href="#">Features</a></li>
                      <li><a href="#">Pricing</a></li>
                      <li><a href="#">Integration</a></li>
                    </ul>
                  </div>
                  <div class="sub-menu-links">
                    <div class="sub-menu">
                      <h6>CREATE</h6>
                      <ul>
                        <li><a href="#">Recording</a></li>
                        <li><a href="#">Hosting</a></li>
                        <li><a href="#">Collaboration</a></li>
                        <li><a href="#">Management</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>PRESENT</h6>
                      <ul>
                        <li><a href="#">Player</a></li>
                        <li><a href="#">Embedding</a></li>
                        <li><a href="#">Interactivity</a></li>
                        <li><a href="#">Channels</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>GROW</h6>
                      <ul>
                        <li><a href="#">SEO</a></li>
                        <li><a href="#">Subscribers</a></li>
                        <li><a href="#">Reach & retarget</a></li>
                        <li><a href="#">Analytics</a></li>
                      </ul>
                    </div>
                  </div>
                </div>
              </li>
              <li class="main-link">
                Learning Center <i class="fas fa-chevron-down"></i>
                <div class="dropdown">
                  <div class="cta">
                    <h4>Learning Center</h4>
                    <p>
                      Use our software and your videos to grow your business.
                    </p>
                    <a href="#">Start for free</a>
                  </div>
                  <div class="major">
                    <ul>
                      <li><a href="#">Features</a></li>
                      <li><a href="#">Pricing</a></li>
                      <li><a href="#">Integration</a></li>
                    </ul>
                  </div>
                  <div class="sub-menu-links">
                    <div class="sub-menu">
                      <h6>CREATE</h6>
                      <ul>
                        <li><a href="#">Recording</a></li>
                        <li><a href="#">Hosting</a></li>
                        <li><a href="#">Collaboration</a></li>
                        <li><a href="#">Management</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>PRESENT</h6>
                      <ul>
                        <li><a href="#">Player</a></li>
                        <li><a href="#">Embedding</a></li>
                        <li><a href="#">Interactivity</a></li>
                        <li><a href="#">Channels</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>GROW</h6>
                      <ul>
                        <li><a href="#">SEO</a></li>
                        <li><a href="#">Subscribers</a></li>
                        <li><a href="#">Reach & retarget</a></li>
                        <li><a href="#">Analytics</a></li>
                      </ul>
                    </div>
                  </div>
                </div>
              </li>
              <li class="main-link">
                Podcasts & Series <i class="fas fa-chevron-down"></i>
                  <div class="dropdown">
                  <div class="cta">
                    <h4>Podcasts & Series</h4>
                    <p>
                      Use our software and your videos to grow your business.
                    </p>
                    <a href="#">Start for free</a>
                  </div>
                  <div class="major">
                    <ul>
                      <li><a href="#">Features</a></li>
                      <li><a href="#">Pricing</a></li>
                      <li><a href="#">Integration</a></li>
                    </ul>
                  </div>
                  <div class="sub-menu-links">
                    <div class="sub-menu">
                      <h6>CREATE</h6>
                      <ul>
                        <li><a href="#">Recording</a></li>
                        <li><a href="#">Hosting</a></li>
                        <li><a href="#">Collaboration</a></li>
                        <li><a href="#">Management</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>PRESENT</h6>
                      <ul>
                        <li><a href="#">Player</a></li>
                        <li><a href="#">Embedding</a></li>
                        <li><a href="#">Interactivity</a></li>
                        <li><a href="#">Channels</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>GROW</h6>
                      <ul>
                        <li><a href="#">SEO</a></li>
                        <li><a href="#">Subscribers</a></li>
                        <li><a href="#">Reach & retarget</a></li>
                        <li><a href="#">Analytics</a></li>
                      </ul>
                    </div>
                  </div>
                </div>
              </li>
              <li class="main-link">
                About <i class="fas fa-chevron-down"></i>
                <div class="dropdown">
                  <div class="cta">
                    <h4>About</h4>
                    <p>
                      Use our software and your videos to grow your business.
                    </p>
                    <a href="#">Start for free</a>
                  </div>
                  <div class="major">
                    <ul>
                      <li><a href="#">Features</a></li>
                      <li><a href="#">Pricing</a></li>
                      <li><a href="#">Integration</a></li>
                    </ul>
                  </div>
                  <div class="sub-menu-links">
                    <div class="sub-menu">
                      <h6>CREATE</h6>
                      <ul>
                        <li><a href="#">Recording</a></li>
                        <li><a href="#">Hosting</a></li>
                        <li><a href="#">Collaboration</a></li>
                        <li><a href="#">Management</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>PRESENT</h6>
                      <ul>
                        <li><a href="#">Player</a></li>
                        <li><a href="#">Embedding</a></li>
                        <li><a href="#">Interactivity</a></li>
                        <li><a href="#">Channels</a></li>
                      </ul>
                    </div>
                    <div class="sub-menu">
                      <h6>GROW</h6>
                      <ul>
                        <li><a href="#">SEO</a></li>
                        <li><a href="#">Subscribers</a></li>
                        <li><a href="#">Reach & retarget</a></li>
                        <li><a href="#">Analytics</a></li>
                      </ul>
                    </div>
                  </div>
                </div>
              </li>
            </ul>
          </div>
        </div>
        <div class="buttons">
          <a href="#">Sign In</a>
          <a href="#">Get Started</a>
        </div>
      </div>
    </nav>

    <script src="./app.js"></script>
  </body>
</html>

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错误还原：在查询的过程中，传入的workType为0时，该条件不起作用 &lt;select id=&quot;xxx&quot;&gt; SELECT di.id, di.name, di.work_type, di.updated... &lt;where&gt; &lt;if test=&qu
linux中make编译源码包失败
报错如下，gcc版本太低 ^ server.c:5346:31: 错误：‘struct redisServer’没有名为‘server_cpulist’的成员 redisSetCpuAffinity(server.server_cpulist); ^ server.c: 在函数‘hasActiveC
微服务启动错误：Command line is too long. Shorten command line for
解决方案1 1、改项目中.idea/workspace.xml配置文件，增加dynamic.classpath参数 2、搜索PropertiesComponent，添加如下 &lt;property name=&quot;dynamic.classpath&quot; value=&quot;tru
vue常见错误
删除根组件app.vue中的默认代码后报错：Module Error (from ./node_modules/eslint-loader/index.js): 解决方案：关闭ESlint代码检测，在项目根目录创建vue.config.js，在文件中添加 module.exports = { lin
spark常见错误
查看spark默认的python版本 [root@master day27]# pyspark /home/software/spark-2.3.4-bin-hadoop2.7/conf/spark-env.sh: line 2: /usr/local/hadoop/bin/hadoop: No s
matplotlib报错：AttributeError: module 'backend_interagg' has no attribute 'FigureCanvas'. Did you mean: 'FigureCanvasAgg'?
使用本地python环境可以成功执行 import pandas as pd import matplotlib.pyplot as plt # 设置字体 plt.rcParams[&#39;font.sans-serif&#39;] = [&#39;SimHei&#39;] # 能正确显示负号 p
gitlab登录失败，报错：This challenge page was accidentally cached by an intermediary and is no longer available.
设置时间 控制面板
后端开发常见错误
错误1：Request method ‘DELETE‘ not supported 错误还原：controller层有一个接口，访问该接口时报错：Request method ‘DELETE‘ not supported 错误原因：没有接收到前端传入的参数，修改为如下 参考 错误2：cannot r
docker常见错误
错误1：启动docker镜像时报错：Error response from daemon: driver failed programming external connectivity on endpoint quirky_allen 解决方法：重启docker -&gt; systemctl r
idea常见错误
错误1：private field ‘xxx‘ is never assigned 按Altʾnter快捷键，选择第2项 参考：https://blog.csdn.net/shi_hong_fei_hei/article/details/88814070 错误2：启动时报错，不能找到主启动类 #
pip安装依赖失败
报错如下，通过源不能下载，最后警告pip需升级版本 Requirement already satisfied: pip in c:\users\ychen\appdata\local\programs\python\python310\lib\site-packages (22.0.4) Coll
maven常见错误
错误1：maven打包报错 错误还原：使用maven打包项目时报错如下 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources (default-resources)
cloud项目中常见错误
错误1：服务调用时报错 服务消费者模块assess通过openFeign调用服务提供者模块hires 如下为服务提供者模块hires的控制层接口 @RestController @RequestMapping(&quot;/hires&quot;) public class FeignControl
springboot常见错误
错误1：运行项目后报如下错误 解决方案 报错2：Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project sb 解决方案：在pom.
springmvc拦截器中使用redisTemplate报空指针异常
参考 错误原因 过滤器或拦截器在生效时，redisTemplate还没有注入 解决方案：在注入容器时就生效 @Component //项目运行时就注入Spring容器 public class RedisBean { @Resource private RedisTemplate&lt;String
vite报错：npm ERR! command C:WINDOWSsystem32cmd.exe /d /s /c C:UsersychenAppDataLocalTempnpx-dde1c848.cmd
使用vite构建项目报错 C:\Users\ychen\work&gt;npm init @vitejs/app @vitejs/create-app is deprecated, use npm init vite instead C:\Users\ychen\AppData\Local\npm-
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