javascript - bootstrap导航栏莫名多出20px，怎么回事
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问题描述
问 题
<!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">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div 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>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div 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>
</div>
</div>
</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 individual 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>
解决方案
这是因为，Bootstrap的导航栏只是默认是51px高，而并非永远是51px高，如果其中有元素出现多行，是会将高度撑高的。
你的demo里，由于有一个标签多了一个Link，所以将整个导航栏撑高了20px。
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