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按钮组允许多个按钮被堆叠在同一行上。当你想要把按钮对齐在一起时，这就显得非常有用。
给div加上class .btn-group
<!DOCTYPE html>
<html>
<head>
<meta charset = "utf-8">
<title>demo</title>
<link href="bootstrap-3.3.4-dist/css/bootstrap.min.css" rel="stylesheet">
<style type="text/css">
body{padding: 20px;}
</style>
</head>
<body>
<div class="btn-group">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
<button class="btn btn-primary">按钮4</button>
<button class="btn btn-=primary">按钮5</button>
</div>
</body>
</html>
<body>
<div class="btn-toolbar">
<div class="btn-group">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
<button class="btn btn-primary">按钮4</button>
<button class="btn btn-primary">按钮5</button>
</div>
<div class="btn-group">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
<button class="btn btn-primary">按钮4</button>
<button class="btn btn-primary">按钮5</button>
</div>
<div class="btn-group">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
<button class="btn btn-primary">按钮4</button>
<button class="btn btn-primary">按钮5</button>
</div>
</div>
</body>
给btn-group 加上.btn-group-lg，.btn-group-sm，.btn-group-xs可以调整整个按钮组的按钮大小
<body>
<div class="btn-toolbar">
<div class="btn-group btn-group-lg">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
<div class="btn-group btn-group-lg">
<button type="button" class="btn btn-default dropdown-toggle"
data-toggle="dropdown">
下列
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li><a href="#">下拉链接 1</a></li>
<li><a href="#">下拉链接 2</a></li>
</ul>
</div>
</div>
</div>
</body>
时，就会用到这个。
<body>
<div class="btn-toolbar">
<div class="btn-group btn-group-lg">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
<button type="button" class="btn btn-default dropdown-toggle"
data-toggle="dropdown">
下列
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li><a href="#">下拉链接 1</a></li>
<li><a href="#">下拉链接 2</a></li>
</ul>
</div>
</div>
</body>
感觉嵌套并没有什么作用，于是去掉btn-group，显示效果变成如下。
审查元素，发现.dropdown-menu使用的是绝对定位，而.btn-group是相对定位，因为就不难理解为什么我们去掉嵌套的
btn-group之后，效果变成了上图所示。
<body>
<div class="btn-toolbar">
<div class="btn-group btn-group-lg">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
</div>
<div class="btn-group">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
</div>
<div class="btn-group btn-group-lg btn-group-vertical">
<button class="btn btn-primary">按钮1</button>
<button class="btn btn-primary">按钮2</button>
<button class="btn btn-primary">按钮3</button>
</div>
</div>
</body>
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原文地址：http://blog.csdn.net/liuyan19891230/article/details/50465291
