用Bootstrap指示关闭图标
要在Bootstrap中设置关闭图标，请使用.close类。
您可以尝试运行以下代码来设置关闭图标-
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 style = "width:600px;background-color:orange;">
<span>Here's the close icon</span>
<button type = "button" class = "close"><span aria-hidden = "true">&times;</span>
<span class = "sr-only">
Close icon
</span>
</button>
</div>
</body>
</html>