<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>html</title>
<link rel="stylesheet" href="./rule/bootstrap-Normalize.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<p class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<p class="navbar-header">
<button type="button" class="navbar-toggle collapase" data-toggle="collapase" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</a>
</p>
<!-- Collect the nav links, forms, and other content for toggling -->
<p class="collapse navbar-collapse" id="bs-example-navbar-collapse-1" >
<ul class="nav navbar-nav">
<li class="active"><a href="#">Link <span class="sr-only"></span></a>Link</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li><a role="separator" href="#"></a></li>
<li><a href="#">Separated link</a></li>
<li><a role="separator" href="#"></a></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
</p>
</p>
</nav>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include inpidual files as needed -->
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="main.js">
</script>
</body>
</html>
![[Web front-end] Permulaan pantas Node.js](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Ini kerana bar navigasi Bootstrap hanya 51px tinggi secara lalai, dan tidak selalunya 51px tinggi Jika terdapat berbilang baris elemen di dalamnya, ketinggian akan dinaikkan.
Dalam demo anda, kerana satu label mempunyai pautan tambahan, keseluruhan bar navigasi dinaikkan sebanyak 20px.
Adakah ia disediakan oleh rangka kerja Marign:0 atau padding:0 tidak sah
Anda boleh mencari bar navigasi dalam pepohon DOM konsol, dan kemudian padamkan elemen satu demi satu dari dalam ke luar untuk mengetahui elemen mana yang menyebabkan masalah