我有一个带有简单导航栏的简单网站，但经过大量研究后，这似乎是一项非常艰巨的任务 当鼠标悬停在任何按钮上时，它会显示一个下拉列表以显示更多选项 我的工作正常，但当我将鼠标悬停在下拉列表的内容上时，我将如何继续下拉？
基本上当光标离开导航栏上的按钮并进入下拉菜单时，它不会消失。
我读到jQuery是可能的，但是如果可能的话，我想在JavaScript中单独使用它，即使它很长。
导航栏的悬停本身可以正常工作，但是无论我在悬停在其上时是什么设法保持下拉状态，都会不停地窃听所有内容。
这是我的代码，我尝试过：
document.getElementById("server").onmouseover = function() {
serverMouseOver()
};
document.getElementById("server").onmouseout = function() {
serverMouseOut()
};
function serverMouseOver() {
document.getElementById("serverdropdownbox").className += "animated fadeIn";
};
function serverMouseOut() {
document.getElementById("serverdropdownbox").className += "animated fadeOut";
};
document.getElementById("serverdropdownbox").onmouseover = function() {
serverDropdownMouseOver()
};
document.getElementById("serverdropdownbox").onmouseout = function() {
serverDropdownMouseOut()
};
function serverDropdownMouseOver() {
document.getElementById("serverdropdownbox").style.opacity = "1";
};
function serverDropdownMouseOut() {
document.getElementById("serverdropdownbox").style.opacity = "0";
};
#navbarbox
{
clear: both;
display: block;
width: 100vw;
height: 3.5vw;
padding: 0vw 0 0 0;
margin: 0;
}
#navbar, #navbar ul
{
width: 100vw;
height: 3.5vw;
display: flex;
padding: 0 0 0 0;
margin: 0;
}
#navbar span
{
height: 3.5vw;
display: block;
transform: skewX(15deg);
}
#navbar li
{
color: white;
list-style: none;
display: inline-block;
padding: 1vw 3.95vw 1vw 3.95vw;
margin: auto;
text-align: center;
color: red;
font-size: 2.3vw;
font-family: Jura;
height: 2.5vw;
transform: skewX(-15deg);
}
#serverdropdownbox
{
display: block;
opacity: 0;
float: left;
color: white;
background-color: darkblue;
width: 0;
}
#serverdropdowncontent
{
list-style-type: none;
width: 16vw;
margin: 1vw 0 0 10.1vw;
}
#serverdropdowncontent li
{
border: 1px solid white;
font-size: 25px;
text-align: center;
padding: 1vw 0 1vw 0;
background-color: white;
}
#server
{
background-color: blue;
}
#communitydropdownbox
{
display: block;
float: left;
color: white;
background-color: darkblue;
width: 0;
}
#communitydropdowncontent
{
list-style-type: none;
width: 19.7vw;
margin: 1vw 0 0 26vw;
}
#communitydropdowncontent li
{
border: 1px solid white;
font-size: 25px;
text-align: center;
padding: 1vw 0 1vw 0;
}
#community
{
background-color: brown;
}
#storedropdownbox
{
display: block;
float: left;
color: white;
background-color: darkblue;
width: 0;
}
#storedropdowncontent
{
list-style-type: none;
width: 13.6vw;
margin: 1vw 0 0 45.65vw;
}
#storedropdowncontent li
{
border: 1px solid white;
font-size: 25px;
text-align: center;
padding: 1vw 0 1vw 0;
}
#store
{
background-color: blue;
}
#downloadsdropdownbox
{
display: block;
float: left;
color: white;
background-color: darkblue;
width: 0;
}
#downloadsdropdowncontent
{
list-style-type: none;
width: 19.8vw;
margin: 1vw 0 0 59.2vw;
}
#downloadsdropdowncontent li
{
border: 1px solid white;
font-size: 25px;
text-align: center;
padding: 1vw 0 1vw 0;
}
#downloads
{
background-color: brown;
}
#contactdropdownbox
{
display: block;
float: left;
color: white;
background-color: darkblue;
width: 0;
}
#contactdropdowncontent
{
list-style-type: none;
width: 16vw;
margin: 1vw 0 0 78.9vw;
}
#contactdropdowncontent li
{
border: 1px solid white;
font-size: 25px;
text-align: center;
padding: 1vw 0 1vw 0;
}
#contact
{
background-color: blue;
}
.animated
{
animation-duration: 1s;
animation-fill-mode: both;
}
@keyframes fadeIn {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
.fadeIn {
animation-name: fadeIn;
}
@keyframes fadeOut {
from {
opacity: 1;
}
to {
opacity: 0;
}
}
.fadeOut {
animation-name: fadeOut;
}<head>
<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Jura" />
<body>
<!--Giga logo, top left-->
<img id="gigalogo" src="images/gigalogo.png">
<!--Steam logo, top right-->
<div id="steamlogomainbox">
<img id="steamlogo" src="images/steamlogo.png">
</div>
<!--navigation barrrrrr-->
<div id="navbarbox">
<ul id="navbar">
<a href="default.html"><li style="background-color: purple;"><span>Home</span></li></a>
<a href="servers.html"><li id="server"><span>Servers</span></li></a>
<a href="community.html"><li id="community"><span>Community</span></li></a>
<a href="store.html"><li id="store"><span>Store</span></li></a>
<a href="downloads.html"><li id="downloads"><span>Downloads</span></li></a>
<a href="contact.html"><li id="contact"><span>Contact</span></li></a>
</ul>
</div>
<div id="serverdropdownbox">
<ul id="serverdropdowncontent">
<a href="serverlist.html"><li id="serverdropdownli">Server List</li></a>
<li id="serverdropdownli">GigaDB</li>
<li id="serverdropdownli">CS:GO</li>
</ul>
</div>
<div id="communitydropdownbox">
<ul id="communitydropdowncontent">
<a href="events.html"><li>Events</li></a>
<li></li>
</ul>
</div>
<div id="storedropdownbox">
<ul id="storedropdowncontent">
<li>Credits</li>
<li>Items</li>
<li>VIP</li>
</ul>
</div>
<div id="downloadsdropdownbox">
<ul id="downloadsdropdowncontent">
<li>TF2</li>
<li>CS:GO</li>
<li>Minecraft</li>
</ul>
</div>
<div id="contactdropdownbox">
<ul id="contactdropdowncontent">
<li>Contact Us</li>
<li>Staff</li>
<a href="https://steamcommunity.com/groups/gigagamings" target="_blank"><li>Steam Group</li></a>
<li>Appeal Ban</li>
<li>Links</li>
</ul>
</div>
答案 0 :(得分：1)
首先，您的HTML结构无效。 ul代码只能li作为直接子代，而不是a。因此ul > a > li必须替换为ul > li > a。
第二 - 你不需要JS这么简单的菜单。将ul > li > ul作为子菜单，并使用:hover上的ul > li来显示您的子菜单。
ul {
padding: 0;
}
li {
white-space: nowrap;
list-style: none;
}
#menu > li {
position: relative;
display: inline-block;
}
#menu > li > ul {
position: absolute;
left: 0;
top: 100%;
min-width: 100%;
opacity: 0;
transition: opacity 200ms ease-in-out;
}
#menu > li:hover > ul {
opacity: 1;
}<ul id="menu">
<li><a href="home.html">Home</a></li>
<li>
<span>Servers</span>
<ul>
<li><a href="server1.html">Server 1</a></li>
<li><a href="server2.html">Server 2</a></li>
<li><a href="server3.html">Server 3</a></li>
</ul>
</li>
</ul>