我长期使用 Twitter Bootstrap 和 Chosen 美丽的下拉菜单。我从来没有遇到过这样的问题。您可能会在引导 CSS 或丢失/覆盖样式之前插入选择的 CSS。这是完整的工作代码...
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<!-- scale the devices -->
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<!-- include bootstrap css files -->
<link rel="stylesheet" type="text/css" href="/bootstrap/css/bootstrap.css" />
<link rel="stylesheet" type="text/css" href="/bootstrap/css/bootstrap-responsive.css" />
<title>Twitter Bootstrap + Choosen</title>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<!-- includ jquery and bootstrap script -->
<script type="text/javascript" src="//code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" src="/bootstrap/js/bootstrap.js"></script>
<!-- choosen -->
<link rel="stylesheet" type="text/css" href="/chosen/chosen.css" />
<script type="text/javascript" src="/chosen/chosen.jquery.min.js"></script>
<script type="text/javascript">
$(document).ready( function() {
// chosen select
$("form select").chosen({no_results_text: "No results matched"});
});
</script>
</head>
<body>
<!-- container -->
<div class="container">
<!-- content -->
<div class="row">
<div class="span12">
<!-- user form -->
<form method="post" action="" class="form-horizontal">
<div class="control-group">
<label for="group_id" class="control-label">User Group : </label>
<div class="controls">
<select name="group_id" id="group_id" class="input-xlarge">
<option value="">select...</option>
<option value="1">Administrator</option>
<option value="3"selected="selected">Users</option>
<option value="4">Random</option>
<option value="5">Super New</option>
<option value="6">Famous</option>
</select>
</div>
</div>
</form>
<!-- // end form -->
</div>
</div>
<!-- // end content -->
</div>
<!-- // end container -->
</body>
</html>
这是图片附件/屏幕截图(原样)
![Twitter Bootstrap + 选择的 jQuery 插件](https://i.stack.imgur.com/hR6IB.png)
希望这可以帮助。谢谢!!