这应该将div拆分为列，但这不起作用——不确定为什么？
就像col-lg-8和col-lg-4一样，大屏幕应该一分为二。
<!DOCTYPE html>
<html>
<head>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js">
<link rel="stylesheet" href="styles.css">
</head>
<body>
<h1>Hello World</h1>
<div class="container">
<div class="row">
<div class="col-sm-3 col-md-6 col-lg-4" style="background-color:yellow;">
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
</div>
<div class="col-sm-9 col-md-6 col-lg-8" style="background-color:pink;">
Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.
</div>
</div>
</div>
</body>
</html>您错误地连接了引导程序样式和脚本。使用波纹管。
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>