我的页面顶部有一个固定的导航栏和一个带有动画滚动的滚动设置。但是，当我单击导航链接时，页面会滚动到导航栏的 top 与锚定div的 top 对齐的位置。我希望导航栏的 bottom 与锚定的div的 top 对齐，以便不覆盖该锚定div中的任何内容}。我怎么能这样做？
就我的代码而言，我从this example from W3schools.
开始答案 0 :(得分：2)
要滚动每个部分的顶部而不是50px的额外偏移，您可以从这两个部分中减去50：
$('html, body').animate({
scrollTop: $(hash).offset().top-50
}, 800, function(){
// Add hash (#) to URL when done scrolling (default click behavior)
window.location.hash = hash-50;
});
原始片段:(从顶部向上滚动至50）
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
body {
position: relative;
}
#section1 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #1E88E5;
}
#section2 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #673ab7;
}
#section3 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #ff9800;
}
#section41 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #00bcd4;
}
#section42 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #009688;
}
</style>
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">WebSiteName</a>
</div>
<div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<li><a href="#section1">Section 1</a></li>
<li><a href="#section2">Section 2</a></li>
<li><a href="#section3">Section 3</a></li>
<li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Section 4 <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#section41">Section 4-1</a></li>
<li><a href="#section42">Section 4-2</a></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</nav>
<div id="section1" class="container-fluid">
<h1>Section 1</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<div id="section2" class="container-fluid">
<h1>Section 2</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<div id="section3" class="container-fluid">
<h1>Section 3</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<div id="section41" class="container-fluid">
<h1>Section 4 Submenu 1</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<div id="section42" class="container-fluid">
<h1>Section 4 Submenu 2</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<script>
$(document).ready(function() {
// Add scrollspy to <body>
$('body').scrollspy({
target: ".navbar",
offset: 50
});
// Add smooth scrolling on all links inside the navbar
$("#myNavbar a").on('click', function(event) {
// Make sure this.hash has a value before overriding default behavior
if (this.hash !== "") {
// Prevent default anchor click behavior
event.preventDefault();
// Store hash
var hash = this.hash;
// Using jQuery's animate() method to add smooth page scroll
// The optional number (800) specifies the number of milliseconds it takes to scroll to the specified area
$('html, body').animate({
scrollTop: $(hash).offset().top
}, 800, function() {
// Add hash (#) to URL when done scrolling (default click behavior)
window.location.hash = hash;
});
} // End if
});
});
</script>
</body>
</html>
修订后的片段:(滚动到每个部分的顶部）
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
body {
position: relative;
}
#section1 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #1E88E5;
}
#section2 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #673ab7;
}
#section3 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #ff9800;
}
#section41 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #00bcd4;
}
#section42 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #009688;
}
</style>
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">WebSiteName</a>
</div>
<div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<li><a href="#section1">Section 1</a></li>
<li><a href="#section2">Section 2</a></li>
<li><a href="#section3">Section 3</a></li>
<li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Section 4 <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#section41">Section 4-1</a></li>
<li><a href="#section42">Section 4-2</a></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</nav>
<div id="section1" class="container-fluid">
<h1>Section 1</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<div id="section2" class="container-fluid">
<h1>Section 2</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<div id="section3" class="container-fluid">
<h1>Section 3</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<div id="section41" class="container-fluid">
<h1>Section 4 Submenu 1</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<div id="section42" class="container-fluid">
<h1>Section 4 Submenu 2</h1>
<p>Click on the different Section links in the navbar to see the smooth scrolling effect.</p>
</div>
<script>
$(document).ready(function() {
// Add scrollspy to <body>
$('body').scrollspy({
target: ".navbar",
offset: 50
});
// Add smooth scrolling on all links inside the navbar
$("#myNavbar a").on('click', function(event) {
// Make sure this.hash has a value before overriding default behavior
if (this.hash !== "") {
// Prevent default anchor click behavior
event.preventDefault();
// Store hash
var hash = this.hash;
// Using jQuery's animate() method to add smooth page scroll
// The optional number (800) specifies the number of milliseconds it takes to scroll to the specified area
$('html, body').animate({
scrollTop: $(hash).offset().top - 50
}, 800, function() {
// Add hash (#) to URL when done scrolling (default click behavior)
window.location.hash = hash - 50;
});
} // End if
});
});
</script>
</body>
</html>