每当我将鼠标悬停在导航栏上时，它都会创建一个下拉菜单，但它会被使用脚本标签创建的 map 挡住。
这是它的样子:
// JavaScript Document
//This will make the navigation bar responsive.
function myFunction() {
var x = document.getElementById("myTopnav");
if (x.className === "topnav") {
x.className += " responsive";
} else {
x.className = "topnav";
}
}@charset "utf-8";
/* CSS Document */
h1 {
margin-top: 2.2em;
margin-bottom: 2.2em;
width:100%;
font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
font-size: 5vmin;
color: white;
text-align:center;
font-weight: 300;
}
.auto-style1{
left: 25%;
right: 25%;
}
#map {
height: 200px;
width: 50%;
}
.text{
width:100%;
display: inline-block;
text-align: center;
}
body {margin:0;}
/*This will style the navigation bar container*/
ul.topnav {
list-style-type: none;
margin: 0;
padding: 0;
overflow: visible;
top: 0;
position:fixed;
width: 100%;
background-color: rgba(0,0,0,0.75);
text-align:center;
}
ul.topnav li {float: left;}
/*This will style the items in navigation bar*/
ul.topnav li a, .dropbtn {
display: block;
color: #FFF;
text-align: center;
padding: 14px 16px;
text-decoration: none;
transition: 0.3s;
font-size: 13.75px;
font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande", "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
font-weight:bold;
}
ul.topnav li a:hover, .dropdown:hover .dropbtn {background-color: #F00;}
ul.topnav li.dropdown {
display: inline-block;
position: relative;
}
/*This will style the dropdown container*/
ul.topnav .dropdown-content{
display:none;
position: absolute;
background-color: #000;
width: 100%;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
text-align:center;
left: 0;
}
/*This will style the dropdown items*/
ul.topnav .dropdown-content a{
color: #FFF;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande", "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
}
ul.topnav .dropdown-content a:hover {
background-color: #999;
}
ul.topnav .dropdown:hover .dropdown-content {display: block;}
ul.topnav li.icon {display: none;}
@media screen and (max-width:680px) { /* Allow responsive navigation bar */
ul.topnav li:not(:first-child) {display: none;}
ul.topnav li.icon {
float: right;
display: inline-block;
}
}
@media screen and (max-width:680px) {
ul.topnav.responsive {position: relative;}
ul.topnav.responsive li.icon {
position: absolute;
right: 0;
top: 0;
}
ul.topnav.responsive li {
float: none;
display: inline;
}
ul.topnav.responsive li a {
display: block;
text-align: left;
}
ul.topnav.responsive .dropdown-content{
width: auto;
min-width: 160px;
left: 0;
}
ul.topnav li.dropdown{
position: static;
}
}
.topnav li {
width: 20%;
margin: 0;
padding:0;
}
/*Footer CSS*/
body{
padding: 0;
display: flex;
min-height: 100vh;
flex-wrap: wrap;
}
.wrapper{
padding:20px;
height:auto;
}
footer{
background-color:#333;
color: #FFF;
font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande", "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
font-weight:bold;
align-self: flex-end;
line-height: 3;
text-align: center;
width: 100%;
}
footer img{
width:42px;
height: 42px;
margin: 0 1em;
}
hr{
width:100%;
}
footer p{white-space:pre;
font-size: 3vmin;} /* Change. Please apply to other footers. */<!doctype html>
<html class="">
<head>
<meta charset="utf-8">
<title>Contact Us</title>
<link href="_css/headfoot.css" rel="stylesheet" type="text/css">
<link href="_css/SPcontent.css" rel="stylesheet" type="text/css">
<style type="text/css">
body {
background-image: url(http://hitcolors.com/wp-content/uploads/2016/08/Green-1.jpg);
}
</style>
<script src="_script/headfoot.js"></script>
</head>
<body>
<ul class="topnav" id="myTopnav">
<li><a class="active" href="#home">HOME</a></li>
<li class="dropdown">
<a href="#" class="dropbtn">MENU</a>
<div class="dropdown-content">
<a href="#">Appetizer</a>
<a href="#">Main Course</a>
<a href="#">Dessert</a>
<a href="#">Soup</a>
<a href="#">Drinks</a>
<a href="#">Side Snacks</a>
</div>
</li>
<li><a href="#aboutus">ABOUT US</a></li>
<li class="dropdown"> <a href="#" class="dropbtn">PROMOTIONS</a>
<div class="dropdown-content"> <a href="#">Breakfast</a> <a href="#">Lunch</a> <a href="#">Dinner</a> </div>
</li>
<li><a href="#contactus">CONTACT US</a></li>
<li class="icon">
<a href="javascript:void(0);" style="font-size:15px;" onclick="myFunction()"></a>
</li>
</ul>
<h1>
<strong><b>Contact Us</b></strong>
</h1>
<div id="map" class="auto-style1">
<script>
function initMap() {
var uluru = {lat: 3.9414186, lng: 108.3774456};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 6,
center: uluru
});
var marker = new google.maps.Marker({
position: uluru,
map: map
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyAgtkYIVZT6nPYk_xCl-2f50M3YWjNkUJM&callback=initMap">
</script>
</div>
<div class="text">
<p>Address : 24,Jln Bunga Emas,43841 Syurga,Frankestain,Mars.</p>
<p>Telephone Line : 03-87876666</p>
<p>Email : 7Dwarfs@email.com</p>
</div>
<footer>
<div class="wrapper">
<img src="Social%20Media%20Icons/facebook-icon.png" alt="Facebook"/>
<img src="Social%20Media%20Icons/icon-twitter.png" alt="Twitter"/>
<img src="Social%20Media%20Icons/YouTube-icon-full_color.png" alt="YouTube"/>
<img src="Social%20Media%20Icons/original_instagram-circle-icon.png" alt="Instagram"/>
<img src="Social%20Media%20Icons/tumblr-logo-icon-8.png" alt="Tumblr"/>
<img src="Social%20Media%20Icons/google-plus-icon.png" alt="GooglePlus"/>
<hr>
<p>S T A Y C O N N E C T E D</p>
</div>
</footer>
</body>
</html>我想要实现的是将下拉菜单放在前面，将 map 放在后面。
最佳答案
您所描述的是 z-index 的完美用例。要了解更多信息，https://developer.mozilla.org/en-US/docs/Web/CSS/z-index .
从本质上讲，z-index 越大，与其他具有较小 z-index 的元素相比，它“更接近”屏幕。因此，在您的情况下，只需将导航设置为 z-index: 2; 并将 map 设置为 z-index:1;。
关于javascript - 我的导航栏被 Javascript 映射挡住了。如何解决？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39813723/