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http://getbootstrap.com/ ver 4.0から手動でブートストラップをダウンロードしましたが、私のナビゲーション、XS、パネルクラスが動作しない理由を知りません。私はboostrap.min.cssでxsを検索しましたが、見つからなかったのです。何が悪いのですか？sm、md、lgクラスはすべて正常に動作しています。なぜいくつかのクラスが動作している理由がわかりません&なぜいくつかのクラスが動作しない理由は、私が公式にダウンロードした&スタイルシートのパスも完璧です。それはすべての解決策です。私のブートストラップナビゲーションが動作しないのはなぜですか？
が<!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>
これはPHPとは何の関係もありません。 Btwあなたはブートストラップグリッドシステムのためにgoogleする必要があります。あなたのグリッドはまったく正しくありません。私が覚えている限り、グリッドシステムは12ポイントのグリッドシステムに基づいています。あなたは実際に1列に8行のcol-6を持っています。どのようにブートストラップがこれをハンドリングしているかわからないが、正しく表示されるかもしれないが、私はその良い習慣を考えていない。 – Twinfriends