</div>
        <div class="btn-group">
            <button class="btn btn-primary">按钮2</button>
        </div>
        <div class="btn-group">
            <button class="btn btn-primary">按钮3</button>
        </div>
    </div>
    <br><br>
    <div class="btn-group-vertical">
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮1</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮2</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮3</a>
    </div>
    <div class="btn-group-vertical btn-group-lg">
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮1</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮2</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮3</a>
    </div>
    <div class="btn-group-vertical btn-group-sm">
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮1</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮2</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮3</a>
    </div>
    <div class="btn-group-vertical btn-group-xs">
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮1</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮2</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮3</a>
    </div>
    <br><br>
    <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮 <span class="caret"></span></a>
    <button class="btn btn-primary">按钮 <span class="caret"></span></button>
    <input type="button" value="http://www.mamicode.com/按钮" class="btn btn-primary"><span class="caret"></span>
    <div class="btn-group">
           <a href="http://www.mamicode.com/#" class="btn btn-primary">按钮</a>
        <a href="http://www.mamicode.com/#" class="btn btn-primary"><span class="caret"></span></a>     
    </div>
    <div class="btn-group">
           <button class="btn btn-primary">按钮</button>
        <button class="btn btn-primary"><span class="caret"></span></button>     
    </div>
    <div class="btn-group dropup">
           <button class="btn btn-primary">按钮</button>
        <button class="btn btn-primary"><span class="caret"></span></button>     
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            <button class="btn btn-default active"><span class="glyphicon glyphicon-eye-open"></span> Watch <span class="caret"></span></button>
            <button class="btn btn-default">3,064</button>
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        <div class="btn-group btn-group-sm">
            <button class="btn btn-default active"><span class="glyphicon glyphicon-star"></span> Unstar</button>
            <button class="btn btn-default">36,296</button>
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        <div class="btn-group btn-group-sm">
            <button class="btn btn-default active"><span class="glyphicon icon-fork"></span> fork</button>
            <button class="btn btn-default">9,258</button>
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