在Bootstrap中关闭警报框时添加褪色效果
在关闭警报时，可以在Bootstrap中使用.fade类来添加褪色效果：
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link href = "/bootstrap/css/bootstrap.min.css" rel = "stylesheet">
<script src = "/scripts/jquery.min.js"></script>
<script src = "/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div class = "container">
<h2>Eclipse Refactoring</h2>
<div class = "alert alert-danger alert-dismissible fade in">
<a href = "#" class = "close" data-dismiss="alert" aria-label = "close">×</a>
To refactor code in Eclipse, try the below given steps in the video (You can also close this alert)
</div>
</div>
<div class = "container">
<div class = "embed-responsive embed-responsive-16by9">
<iframe class = "embed-responsive-item" src = "https://www.youtube.com/embed/YFVV6RAUnNg "></iframe>
</div>
</div>
</body>
</html>