我有一个模态框，在这个模态框中，有一个下拉菜单显示大量隐藏内容，目前它是正常工作的。
现在当你打开下一个模态框、叠在第一个模态框之上并关闭它时，位于下面的模态框上的滚动变为禁用状态。
我已创建了一个完整的示例，包括重现我遇到的问题的步骤。您可以在此处查看。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet">
<title></title>
<style>
</style>
</head>
<body>
<input type="button" data-toggle="modal" data-target="#modal_1" class="btn btn-lg btn-primary" value="Open Modal 1" >
<div class="modal fade" id="modal_1">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
<h4 class="modal-title">First Modal</h4>
</div>
<div class="modal-body">
<form class="form">
<div class="form-group">
<label>1) Open This First: </label>
<input type="button" data-toggle="modal" data-target="#modal_2" class="btn btn-primary" value="Open Modal 2" >
</div>
<div class="form-group">
<label>2) Change this once you have opened the modal above.</label>
<select id="change" class="form-control">
<option value="small">Show Small Content</option>
<option value="large">Show Large Content</option>
</select>
</div>
<div id="large" class='content-div'>
<label>Large Textarea Content.. Try and scroll to the bottom..</label>
<textarea rows="30" class="form-control"></textarea>
</div>
<div id="small" class='content-div'>
<label> Example Text Box</label>
<input type="text" class="form-control">
</div>
</form>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="modal_2">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
<h4 class="modal-title">Second Modal</h4>
</div>
<div class="modal-body">
<hp>This is the stacked modal.. Close this modal, then chenge the dropdown menu, you cannot scroll... </h5>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</body>
<script src="http://code.jquery.com/jquery-1.11.0.min.js" type="text/javascript"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js" type="text/javascript"></script>
<script>
$(document).ready(function() {
$(".content-div").hide();
$("#change").change(function() {
$(".content-div").hide();
$("#" + $(this).val()).show();
});
});
</script>
</html>
这里有一个 Bootply，展示该行为的效果:
