如何解决在引导程序中，bg淡入淡出对blockquote的影响
我正尝试在class =“ content” id =“ testtimonals”部分中使用“ bg-faded”来淡化背景，但是在页面上没有显示效果。
<!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,shrink-to-fit=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<link rel="stylesheet" href="css/bootstrap.min.css">
<title>Bootstrap</title>
</head>
<body>
<div class="container">
<section class="content" id="services">
<h2 class="text-danger">Our Mission</h2>
<p class="bg-danger text-white">Wisdom Pet Medicine strives to blend the best in traditional and alternative medicine in the diagnosis and treatment of companion animals including dogs,cats,birds,reptiles,rodents,and fish. We apply the wisdom garnered in the centuries old tradition of veterinary medicine,to find the safest treatments and cures.</p>
<ul>
<li><a href="#">Grooming</a></li>
<li><a href="#">General Health</a></li>
<li><a href="#">Nutrition</a></li>
<li><a href="#">Pest Control</a></li>
<li><a href="#">Vaccinations</a></li>
</ul>
</section>
<section class="content" id="testimonials">
<h2>Testimonials</h2>
<blockquote class="blockquote bg-faded text-info">
During the summer,our rabbit,Tonto,began to have severe redness and itching on his belly and feet. I'm very thankful to the veterinarians and staff at Wisdom for the excellent care Tonto received,and for nipping his allergies in the bud,so to speak.
<div class="blockquote-footer">
Jane
</div>
</blockquote>
</section>
</div><!-- content container -->
<script src="js/jquery.slim.min.js"></script>
<script src="js/popper.min.js"></script>
<script src="js/bootstrap.min.js"></script>
</body>
</html>
请有人告诉我为什么它不起作用
解决方法
简短答案：
将.bg-faded替换为.bg-light，您的代码将正常运行，如this fiddle所示。
详细答案：
.bg-faded来自过时的alpha version of Bootstrap：
由于我不认为您使用的是Bootstrap的Alpha版本，因此请您参考current v4.5 docs，其中.bg-faded被.bg-light代替：
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