版权声明：独学而无友，则孤陋寡闻。q群582951247 https://blog.csdn.net/mp624183768/article/details/82141524
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script>
$(function () {
$('#collapseThree').collapse('toggle');
$('#collapseOne').collapse('hide');
$('#collapseTwo').collapse('show');
$('#collapseFor').collapse({toggle: false});
$('#collapseTwo').on("show.bs.collapse",function () {
alert("在调用 show 方法后触发该事件。");
});
$('#collapseTwo').on("shown.bs.collapse",function () {
alert("当折叠元素对用户可见时触发该事件（将等待 CSS 过渡效果完成）。");
});
$('#collapseTwo').on("hide.bs.collapse",function () {
alert("当调用 hide 实例方法时立即触发该事件。");
});
$('#collapseTwo').on("hidden.bs.collapse",function () {
alert("当折叠元素对用户隐藏时触发该事件（将等待 CSS 过渡效果完成）。");
});
});
</script>
</head>
<body>
<div class="panel-group" id="accordion">
<div class="panel-heading">
<h4 class="panel-title">
<a href="#collapseOne" data-toggle="collapse" data-parent="#accordion">
点击我进行展开，再次点击我进行折叠。第 1 部分--hide 方法
</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse in">
<div class="panel-body">
Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred
nesciunt sapiente ea proident. Ad vegan excepteur butcher vice
lomo.
</div>
</div>
</div>
<div class="panel panel-success">
<div class="panel-heading">
<h4 class="panel-title">
<a href="#collapseTwo" data-parent="#accordion" data-toggle="collapse">
点击我进行展开，再次点击我进行折叠。第 2 部分--show 方法
</a>
</h4>
</div>
<div id="collapseTwo" class="panel-collapse collapse">
<div class="panel-body">
Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred
nesciunt sapiente ea proident. Ad vegan excepteur butcher vice
lomo.
</div>
</div>
</div>
<div class="panel panel-info">
<div class="panel-heading">
<h4 class="panel-title">
<a href="#collapseThree" data-parent="#accordion" data-toggle="collapse">
点击我进行展开，再次点击我进行折叠。第 3 部分--toggle 方法
</a>
</h4>
</div>
<div id="collapseThree" class="panel-collapse collapse">
<div class="panel-body">
Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred
nesciunt sapiente ea proident. Ad vegan excepteur butcher vice
lomo.
</div>
</div>
</div>
<div class="panel panel-warning">
<div class="panel-heading">
<h4 class="panel-title">
<a href="#collapseFor" data-parent="#accordion" data-toggle="collapse">
点击我进行展开，再次点击我进行折叠。第 4 部分--options 方法
</a>
</h4>
</div>
<div id="collapseFor" class="panel-collapse collapse">
<div class="panel-body">
Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred
nesciunt sapiente ea proident. Ad vegan excepteur butcher vice
lomo.
</div>
</div>
</div>
</div>
</body>
</html>