Bootstrap input-group-btn类
使用类.input-group-btn来包装按钮。由于无法覆盖默认浏览器样式，因此这是必需的。
您可以尝试运行以下代码以在Bootstrap中实现input-group-btn类
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 = "padding: 100px 100px 10px;">
<form class = "bs-example bs-example-form" role = "form">
<div class = "row">
<div class = "col-lg-6">
<div class = "input-group">
<span class = "input-group-btn">
<button class = "btn btn-default" type = "button">
Go!
</button>
</span>
<input type = "text" class = "form-control">
</div><!-- /input-group -->
</div><!-- /.col-lg-6 --><br>
<div class = "col-lg-6">
<div class = "input-group">
<input type = "text" class = "form-control">
<span class = "input-group-btn">
<button class = "btn btn-default" type = "button">
Go!
</button>
</span>
</div>
</div>
</div>
</form>
</div>
</body>
</html>