我正在为祖父制作一个网页，并且在我滚动时，我的导航页面不会停留在顶部，这是我的html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<title>CountrySideBycicling</title>
<link rel="stylesheet" href="main.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-social/5.1.1/bootstrap-social.min.css">
<script src="https://kit.fontawesome.com/8333c8288f.js" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark static-top">
<div class="container">
<a class="navbar-brand" href="#">
<!-- logo -->
<img class = "navbar-brand" src="https://w7.pngwing.com/pngs/764/321/png-transparent-bicycle-shop-cycling-logo-fixed-gear-bicycle-cyclist-top-sport-bicycle-logo.png" alt="">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item active">
<a class="nav-link" href="index.html">Home
<span class="sr-only">(current)</span>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="about.html">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="gallery.html">Gallery</a>
</li>
<li class="nav-item">
<a class="nav-link" href="services.html">Services</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contacts.html">Contact</a>
</li>
<li class="nav-item">
<a class="nav-link" href="brands.html.html">Brands</a>
</li>
</ul>
</div>
</div>
</nav>
<div class="jumbotron text-center">
<div class="container">
<div style="height: 25px;"></div>
<h1>CountrySideBycicling</h1>
<div style="height: 25px;"></div>
<p> Lorem ipsum dolor sit amet consectetur adipisicing elit.
Quisquam officiis aperiam temporibus exercitationem hic provident nesciunt,
quod officia neque quam sint dicta, mollitia commodi illo necessitatibus inventore blanditiis eveniet maiores.
</p>
<div style="height: 25px;"></div>
<button class="btn btn-primary">Read More</button>
</div>
</div>
<!-- Page Content -->
<div class="container">
<!-- Heading Row -->
<div class="row align-items-center my-5">
<div class="col-lg-7">
<img class="img-fluid rounded mb-4 mb-lg-0" src="http://placehold.it/900x400" alt="">
</div>
<!-- /.col-lg-8 -->
<div class="col-lg-5">
<h1 class="font-weight-light">Business Name or Tagline</h1>
<p>This is a template that is great for small businesses. It doesn't have too much fancy flare to it, but it makes a great use of the standard Bootstrap core components. Feel free to use this template for any project you want!</p>
<a class="btn btn-primary" href="#">Call to Action!</a>
</div>
<!-- /.col-md-4 -->
</div>
<!-- /.row -->
<!-- Call to Action Well -->
<div class="card text-white bg-secondary my-5 py-4 text-center">
<div class="card-body">
<p class="text-white m-0">This call to action card is a great place to showcase some important information or display a clever tagline!</p>
</div>
</div>
<!-- /.col-md-4 -->
</div>
<!-- /.row -->
</div>
<!-- /.container -->
<!-- Content section -->
<section class="py-5">
<div class="container">
<h1>Section Heading</h1>
<p class="lead">Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aliquid, suscipit, rerum quos facilis repellat architecto commodi officia atque nemo facere eum non illo voluptatem quae delectus odit vel itaque amet.</p>
</div>
</section>
<!-- Image Section - set the background image for the header in the line below -->
<section class="py-5 bg-image-full" style="background-image: url('https://unsplash.it/1900/1080?image=1081');">
<!-- Put anything you want here! There is just a spacer below for demo purposes! -->
<div style="height: 200px;"></div>
</section>
<!-- Content section -->
<section class="py-5">
<div class="container">
<h1>Section Heading</h1>
<p class="lead">Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aliquid, suscipit, rerum quos facilis repellat architecto commodi officia atque nemo facere eum non illo voluptatem quae delectus odit vel itaque amet.</p>
</div>
</section>
<!-- slider -->
<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
</ol>
<div class="carousel-inner" role="listbox">
<div class="carousel-item active"></div>
<div id="target" class="carousel-item"></div>
<div class="carousel-item"></div>
</div>
<a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
<div style="height: 50px;"></div>
</div>
</div>
<div class="container">
<!-- Content Row -->
<div class="row">
<div class="col-md-4 mb-5">
<div class="card h-100">
<div class="card-body">
<h2 class="card-title">Card One</h2>
<p class="card-text">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Rem magni quas ex numquam, maxime minus quam molestias corporis quod, ea minima accusamus.</p>
</div>
<div class="card-footer">
<a href="#" class="btn btn-primary btn-sm">More Info</a>
</div>
</div>
</div>
<!-- /.col-md-4 -->
<div class="col-md-4 mb-5">
<div class="card h-100">
<div class="card-body">
<h2 class="card-title">Card Two</h2>
<p class="card-text">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quod tenetur ex natus at dolorem enim! Nesciunt pariatur voluptatem sunt quam eaque, vel, non in id dolore voluptates quos eligendi labore.</p>
</div>
<div class="card-footer">
<a href="#" class="btn btn-primary btn-sm">More Info</a>
</div>
</div>
</div>
<!-- /.col-md-4 -->
<div class="col-md-4 mb-5">
<div class="card h-100">
<div class="card-body">
<h2 class="card-title">Card Three</h2>
<p class="card-text">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Rem magni quas ex numquam, maxime minus quam molestias corporis quod, ea minima accusamus.</p>
</div>
<div class="card-footer">
<a href="#" class="btn btn-primary btn-sm">More Info</a>
</div>
</div>
</div>
</div>
</div>
<!-- Footer -->
<footer class="page-footer font-small mdb-color pt-4">
<!-- Footer Links -->
<div class="container text-center text-md-left">
<!-- Footer links -->
<div class="row text-center text-md-left mt-3 pb-3">
<!-- Grid column -->
<div class="col-md-3 col-lg-3 col-xl-3 mx-auto mt-3">
<h6 class="text-uppercase mb-4 font-weight-bold">CountrySideBycicling</h6>
<p>Here you can use rows and columns to organize your footer content. Lorem ipsum dolor sit amet,
consectetur
adipisicing elit.</p>
</div>
<!-- Grid column -->
<hr class="w-100 clearfix d-md-none">
<!-- Grid column -->
<div class="col-md-2 col-lg-2 col-xl-2 mx-auto mt-3">
<h6 class="text-uppercase mb-4 font-weight-bold">Brand Sites</h6>
<p>
<a href="#!">Bikesite</a>
</p>
<p>
<a href="#!">Bikesite</a>
</p>
<p>
<a href="#!">Bikesite</a>
</p>
</div>
<!-- Grid column -->
<hr class="w-100 clearfix d-md-none">
<!-- Grid column -->
<div class="col-md-3 col-lg-2 col-xl-2 mx-auto mt-3">
<h6 class="text-uppercase mb-4 font-weight-bold">Useful links</h6>
<p>
<a href="gallery.html">Gallary</a>
</p>
<p>
<a href="brands.html">Brands</a>
</p>
<p>
<a href="about.html">About</a>
</p>
</div>
<!-- Grid column -->
<hr class="w-100 clearfix d-md-none">
<!-- Grid column -->
<div class="col-md-4 col-lg-3 col-xl-3 mx-auto mt-3">
<h6 class="text-uppercase mb-4 font-weight-bold">Contact</h6>
<p>
<i class="fas fa-home mr-3"></i> windsor, oh, cox road</p>
<p>
<i class="fas fa-envelope mr-3"></i> grandpa@gmail.com</p>
<p>
<i class="fas fa-phone mr-3"></i> + 01 234 567 88</p>
</div>
<!-- Grid column -->
</div>
<!-- Footer links -->
<hr>
<!-- Grid row -->
<div class="row d-flex align-items-center">
<!-- Grid column -->
<div class="col-md-7 col-lg-8">
<!--Copyright-->
<p class="text-center text-md-left">© 2020 Copyright:
<a href="http://www.countrysidebicycling.com/">
<strong>countrysidebicycling.com</strong>
</a>
</p>
</div>
<!-- Grid column -->
<!-- Grid column -->
<div class="col-md-5 col-lg-4 ml-lg-0">
<!-- Social buttons -->
<div class="text-center text-md-right">
<ul class="list-unstyled list-inline">
<li class="list-inline-item">
<a class="btn btn-social-icon btn-vk">
<span class="fa fa-facebook"></span>
</a>
</li>
<li class="list-inline-item">
<a class="btn btn-social-icon btn-vk">
<span class="fa fa-instagram"></span>
</a>
</li>
<li class="list-inline-item">
<a class="btn btn-social-icon btn-vk">
<span class="fa fa-twitter"></span>
</a>
</li>
<li class="list-inline-item">
<a class="btn btn-social-icon btn-vk">
<span class="fa fa-pinterest"></span>
</a>
</li>
</ul>
</div>
</div>
<!-- Grid column -->
</div>
<!-- Grid row -->
</div>
<!-- Footer Links -->
</footer>
<script src="jquery.slim.min.js"></script>
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
</body>
</html>
然后这是我的CSS（还有其他页面，但是我只需要知道如何在此页面中做到这一点）
body{
margin: 0;
padding: 0;
}
div{
width: 100%;
height: 100%;
}
.navbar-default {
background: none;
}
.navbar{
position: fixed;
padding: 10px 0 10px 10px;
top: 0;
width: 100%;
}
footer{
background-color:#e6e6e6;
}
.jumbotron{
background-image: url('download.jpeg');
color: white;
background-attachment: fixed;
background-repeat: no-repeat;
background-size: cover;
min-height: 400px;
margin-top: 0px;
margin-bottom: 8px;
}
a{
color:#2e5984;
}
.navbar-brand{
height: 60px;
width: 100px;
}
#aboutusimg{
background-size: 100%;
background-image: url(download.jpeg);
background-repeat:no-repeat;
height: 400px;
}
/* slider */
.carousel .carousel-item {
width: 100%;
height: 100vh;
background-size: cover;
background-position: center;
}
.carousel .carousel-item:first-of-type {
background-image: url('download.jpeg');
}
.carousel .carousel-item:nth-of-type(2) {
background-image: url("download.jpeg");
}
.carousel .carousel-item:last-of-type {
background-image: url("download.jpeg");
}
.carousel-control-prev-icon, .carousel-control-next-icon {
width: 50px;
height: 50px;
}
/* partners slider, about page */
/* carousel */
h2{
text-align:center;
padding: 20px;
}
/* Slider */
.slick-slide {
margin: 0px 20px;
}
.slick-slide img {
width: 100%;
}
.slick-slider
{
position: relative;
display: block;
box-sizing: border-box;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
-webkit-touch-callout: none;
-khtml-user-select: none;
-ms-touch-action: pan-y;
touch-action: pan-y;
-webkit-tap-highlight-color: transparent;
}
.slick-list
{
position: relative;
display: block;
overflow: hidden;
margin: 0;
padding: 0;
}
.slick-list:focus
{
outline: none;
}
.slick-list.dragging
{
cursor: pointer;
cursor: hand;
}
.slick-slider .slick-track,
.slick-slider .slick-list
{
-webkit-transform: translate3d(0, 0, 0);
-moz-transform: translate3d(0, 0, 0);
-ms-transform: translate3d(0, 0, 0);
-o-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
}
.slick-track
{
position: relative;
top: 0;
left: 0;
display: block;
}
.slick-track:before,
.slick-track:after
{
display: table;
content: '';
}
.slick-track:after
{
clear: both;
}
.slick-loading .slick-track
{
visibility: hidden;
}
.slick-slide
{
display: none;
float: left;
height: 100%;
min-height: 1px;
}
[dir='rtl'] .slick-slide
{
float: right;
}
.slick-slide img
{
display: block;
}
.slick-slide.slick-loading img
{
display: none;
}
.slick-slide.dragging img
{
pointer-events: none;
}
.slick-initialized .slick-slide
{
display: block;
}
.slick-loading .slick-slide
{
visibility: hidden;
}
.slick-vertical .slick-slide
{
display: block;
height: auto;
border: 1px solid transparent;
}
.slick-arrow.slick-hidden {
display: none;
}
它说这篇文章主要是代码，请添加更多详细信息。但是我觉得我拥有所有必要的细节，所以我只是写随机文本以查看问题是否会消失。
答案 0 :(得分：1)
您可以简单地将导航栏置于顶部
将此代码添加到您的.navbar类中
.navbar{
position:fixed;
z-index:10;
}
为简单起见，position: fixed;使其漂浮在原处但也不会移动
因此，在浮动时，其他元素可能会越过它或在它后面，这时就要戴上z-index:10;
答案 1 :(得分：1)
执行此操作的方法是在CSS中使用z-index属性。此属性定义元素的堆栈顺序。我确定您希望导航栏位于页面上所有内容的上方，因此您必须将其堆叠在顶部。您可以在https://www.w3schools.com/cssref/pr_pos_z-index.asp上了解更多有关它的信息。这是一个示例：
<nav class="navbar navbar-expand-lg navbar-dark bg-dark static-top">
Your code for the navbar here...
</nav>
<div id="content">
Your page content here...
</div>
然后使用您的CSS：
.navbar {
z-index: 99;
}
#content {
z-index: 1;
}
这应该会有所帮助，并将导航栏放在页面上所有其他内容的顶部。您可以根据自己的需要进行修改（例如，某些内容需要超出导航栏），但总的来说，您应该使用z-index属性来堆叠项目。