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我从http://getbootstrap.com/版本4.0手动下载引导程序，但我不知道为什么我的导航，XS，面板类不工作，我在boostrap.min.css中搜索XS，但没有找到它。这是什么问题，但sm，md，lg类都工作正常。我不知道为什么有些类正在工作&为什么有些类不工作，我正式下载&样式表路径也是完美的，iam从过去3周修复是它任何解决方案。 这里是我的代码：为什么我的引导程序导航不起作用？
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="UTF-8">
<meta http-equiv="X-UA-compatible" Content="IE-edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="css/bootstrap.min.css" rel="stylesheet" type="text/css">
</head>
<body>
<div class="navbar navbar-default" role="navigation">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="fa fa-align-justify"></span>
</button>
<span class="navbar-brand">Diffie</span>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="#">Link1</a></li>
<li><a href="#">Link2</a></li>
<li><a href="#">Link3</a></li>
<li><a href="#">Link4</a></li>
<li><a href="#">Link5</a></li>
</ul>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-sm-6">
<p class="hidden-xs"><b>AAA Ipsum is simply dummy text of the printing</b> and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
<div class="col-sm-6">
<p>AAA Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
<div class="row">
<div class="col-sm-6 col-md-4 col-lg-3">
<div style="width: auto;height: auto;background-color: gray;color: white;padding: 5px;margin-bottom: 10px;">
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3">
<div style="width: auto;height: auto;background-color: gray;color: white;padding: 5px;margin-bottom: 10px;">
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3">
<div style="width: auto;height: auto;background-color: gray;color: white;padding: 5px;margin-bottom: 10px;">
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3">
<div style="width: auto;height: auto;background-color: gray;color: white;padding: 5px;margin-bottom: 10px;">
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3">
<div style="width: auto;height: auto;background-color: gray;color: white;padding: 5px;margin-bottom: 10px;">
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3">
<div style="width: auto;height: auto;background-color: gray;color: white;padding: 5px;margin-bottom: 10px;">
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3">
<div style="width: auto;height: auto;background-color: gray;color: white;padding: 5px;margin-bottom: 10px;">
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3">
<div style="width: auto;height: auto;background-color: gray;color: white;padding: 5px;margin-bottom: 10px;">
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
</div>
</div>
</div>
</div>
</body>
</html>
这有什么做用PHP。顺便说一句，你应该谷歌自举网格系统。你的网格根本不正确。据我所知，网格系统基于12点网格系统。你实际上是一排col-6的8倍。不知道引导程序如何支持这一点，它可以正确显示，但我不认为它的良好做法。 – Twinfriends