我尝试使用带有引导选择的Label 2，但它看起来与引导(标签1)不同。如何在下面的代码中获取两个标签看起来是一样的？
<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="utf-8">
<Meta http-equiv="X-UA-Compatible" content="IE=edge">
<Meta name="description" content="">
<Meta name="author" content="">
<link rel="shortcut icon" href="../../docs-assets/ico/favicon.png">
<title>Test</title>
<link rel="stylesheet" type="text/css" href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" >
<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.2/css/bootstrap-select.min.css">
<link href="http://getbootstrap.com/examples/non-responsive/non-responsive.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="col-lg-6">
<div class="input-group">
<span class="input-group-addon">Labe 1</span>
<input type="text" class="form-control" name="snpid" placeholder="Test">
<span class="input-group-btn">
<button class="btn btn-default" type="submit">GO!</button>
</span>
</div><!-- /input-group -->
</div><!-- /.col-lg-6 -->
<div>
<BR/>
<HR>
<div class="container">
<form class="form-inline">
<div class="form-group">
<span class="input-group-addon">Label 2</span>
</div>
<div class="form-group">
<select id="lunch" class="selectpicker" data-live-search="true" title="Please select a lunch ...">
<option>Hot Dog,Fries and a Soda</option>
<option>Burger,Shake and a Smile</option>
<option>Sugar,Spice and all things nice</option>
<option>Baby Back Ribs</option>
<option>A really really long option made to illustrate an issue with the live search in an inline form</option>
</select>
</div>
</form>
<div>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<script type="text/javascript" src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.2/js/bootstrap-select.min.js"></script>
<script>
$('.selectpicker').selectpicker();
</script>
</body>
</html>
解决方法
从Bootstrap
docs：
Extend form controls by adding text or buttons before,after,or on both sides of any text-based
<input>. Use.input-groupwith an.input-group-addonor.input-group-btnto prepend or append elements to a single.form-control.
您需要在.input-group中包装select和.input-group-addon：
<div class="input-group">
<span class="input-group-addon">Label 2</span>
<select id="lunch" class="selectpicker form-control" data-live-search="true" title="Please select a lunch ...">
<option>Hot Dog,Fries and a Soda</option>
<option>Burger,Shake and a Smile</option>
<option>Sugar,Spice and all things nice</option>
<option>Baby Back Ribs</option>
<option>A really really long option made to illustrate an issue with the live search in an inline form</option>
</select>
</div>
一探究竟：
<link rel="stylesheet" type="text/css" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<div class="container">
<div class="col-lg-6">
<div class="input-group">
<span class="input-group-addon">Labe 1</span>
<input type="text" class="form-control" name="snpid" placeholder="Test">
<span class="input-group-btn">
<button class="btn btn-default" type="submit">GO!</button>
</span>
</div>
</div>
<br>
<hr>
<div class="container">
<form class="form-inline">
<div class="input-group">
<span class="input-group-addon">Label 2</span>
<select id="lunch" class="selectpicker form-control" data-live-search="true" title="Please select a lunch ...">
<option>Hot Dog,Spice and all things nice</option>
<option>Baby Back Ribs</option>
<option>A really really long option made to illustrate an issue with the live search in an inline form</option>
</select>
</div>
</form>
</div>
</div>
