【问题标题】：Footer bar not displayed as a footer页脚栏不显示为页脚
【发布时间】：2021-01-23 08:14:39
【问题描述】：
我正在尝试从启动模板 bootstrap4 添加，即 html 页面底部的粘性页脚。
不幸的是，页脚仍然在页面中间而不是作为页脚。
我不明白为什么
模板中的两个 css 文件（starter-template.css、sticky-footer.css）都位于 index.html 的同一级别
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
<meta name="generator" content="Jekyll v4.1.1">
<title>Boostrap NavBar & Footer</title>
<link rel="canonical" href="https://getbootstrap.com/docs/4.5/examples/starter-template/">
<!-- Bootstrap core CSS -->
<link href="assets/dist/css/bootstrap.min.css" rel="stylesheet">
<style>
.bd-placeholder-img {
font-size: 1.125rem;
text-anchor: middle;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
@media (min-width: 768px) {
.bd-placeholder-img-lg {
font-size: 3.5rem;
}
}
</style>
<!-- Custom styles for this template -->
<link href="starter-template.css" rel="stylesheet">
<link href="sticky-footer.css" rel="stylesheet">
</head>
<body class="d-flex flex-column h-100">
<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="index.html">NavBar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<li class="nav-item disabled">
<a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Menu</a>
<div class="dropdown-menu" aria-labelledby="dropdown01">
<a class="dropdown-item" href="#">One</a>
<a class="dropdown-item" href="#">Two</a>
<a class="dropdown-item" href="#">Three</a>
</div>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
<button class="btn btn-secondary my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<main role="main" class="container">
<div class="starter-template">
<h1>Sticky footer</h1><br>
<p class="lead">Pin a footer to the bottom of the viewport in desktop browsers with this custom HTML and CSS.</p>
</div>
</main>
<!-- /.container -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script>
window.jQuery || document.write('<script src="../assets/js/vendor/jquery.slim.min.js"><\/script>')
</script>
<script src="../assets/dist/js/bootstrap.bundle.min.js"></script>
<footer class="footer mt-auto py-3">
<div class="container">
<div class="row">
<span class="text-muted">Place sticky footer content here.</span>
</div>
</div>
</footer>
</body>
</html>
【问题讨论】：
标签：
html
css
bootstrap-4
footer
【解决方案1】：
将 html 和 body 设置为 100% 高度：
html, body {
height: 100%;
}
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" rel="stylesheet"/>
<body class="d-flex flex-column h-100">
<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="index.html">NavBar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault"
aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<li class="nav-item disabled">
<a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true"
aria-expanded="false">Menu</a>
<div class="dropdown-menu" aria-labelledby="dropdown01">
<a class="dropdown-item" href="#">One</a>
<a class="dropdown-item" href="#">Two</a>
<a class="dropdown-item" href="#">Three</a>
</div>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
<button class="btn btn-secondary my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<main role="main" class="container">
<div class="starter-template">
<h1>Sticky footer</h1><br>
<p class="lead">Pin a footer to the bottom of the viewport in desktop browsers with this custom HTML and CSS.</p>
</div>
</main><!-- /.container -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"
crossorigin="anonymous"></script>
<script>window.jQuery || document.write('<script src="../assets/js/vendor/jquery.slim.min.js"><\/script>')</script>
<script src="../assets/dist/js/bootstrap.bundle.min.js"></script>
<footer class="footer mt-auto py-3">
<div class="container">
<div class="row">
<span class="text-muted">Place sticky footer content here.</span>
</div>
</div>
</footer>
【解决方案2】：
将position: sticky; 与bottom:0 一起使用
body{
margin:0;}
footer {
position: sticky;
bottom: 0;
left: 0;
right: 0;
width: 100%;
padding: 10px;
background: #ddd;
}
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
<meta name="generator" content="Jekyll v4.1.1">
<title>Boostrap NavBar & Footer</title>
<link rel="canonical" href="https://getbootstrap.com/docs/4.5/examples/starter-template/">
<!-- Bootstrap core CSS -->
<link href="assets/dist/css/bootstrap.min.css" rel="stylesheet">
<style>
.bd-placeholder-img {
font-size: 1.125rem;
text-anchor: middle;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
@media (min-width: 768px) {
.bd-placeholder-img-lg {
font-size: 3.5rem;
}
}
</style>
<!-- Custom styles for this template -->
<link href="starter-template.css" rel="stylesheet">
<link href="sticky-footer.css" rel="stylesheet">
</head>
<body class="d-flex flex-column h-100">
<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="index.html">NavBar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<li class="nav-item disabled">
<a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Menu</a>
<div class="dropdown-menu" aria-labelledby="dropdown01">
<a class="dropdown-item" href="#">One</a>
<a class="dropdown-item" href="#">Two</a>
<a class="dropdown-item" href="#">Three</a>
</div>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
<button class="btn btn-secondary my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<main role="main" class="container">
<div class="starter-template">
<h1>Sticky footer</h1><br>
<p class="lead">Pin a footer to the bottom of the viewport in desktop browsers with this custom HTML and CSS.</p>
</div>
</main>
<!-- /.container -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script>
window.jQuery || document.write('<script src="../assets/js/vendor/jquery.slim.min.js"><\/script>')
</script>
<script src="../assets/dist/js/bootstrap.bundle.min.js"></script>
<footer class="footer mt-auto py-3">
<div class="container">
<div class="row">
<span class="text-muted">Place sticky footer content here.</span>
</div>
</div>
</footer>
</body>
</html>