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效果 说明 示例代码 
<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
 
<div class="btn-group">
    <button type="button" class="btn btn-default dropdown-toggle "  data-toggle="dropdown">
     default
      <span class="caret"></span>          
    </button>
     
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
 
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>    
 
<div class="btn-group">
    <button type="button" class="btn btn-primary dropdown-toggle "  data-toggle="dropdown">
     primary 
      <span class="caret"></span>          
    </button>
     
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
 
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>    
 
<div class="btn-group">
    <button type="button" class="btn btn-success dropdown-toggle "  data-toggle="dropdown">
     success 
      <span class="caret"></span>          
    </button>
     
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
 
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>    
 
<div class="btn-group">
    <button type="button" class="btn btn-info dropdown-toggle "  data-toggle="dropdown">
     info 
      <span class="caret"></span>          
    </button>
     
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
 
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>    
 
<div class="btn-group">
    <button type="button" class="btn btn-warning dropdown-toggle "  data-toggle="dropdown">
     warning 
      <span class="caret"></span>          
    </button>
     
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
 
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>    
 
<div class="btn-group">
    <button type="button" class="btn btn-danger dropdown-toggle "  data-toggle="dropdown">
     danger 
      <span class="caret"></span>          
    </button>
     
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
 
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>    
 
<div style="height:100px"></div>
edit
单按钮下拉菜单
示例代码 
<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.0.3/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
 
<div class="btn-group">
   <button type="button" class="btn btn-default">默认</button>
   <button type="button" class="btn btn-default dropdown-toggle" 
      data-toggle="dropdown">
      <span class="caret"></span>

   </button>
   <ul class="dropdown-menu" role="menu">
     <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
 
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
   </ul>
</div>

<div style="height:100px"></div>
edit
分裂式按钮下拉菜单
示例代码 
<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
<div class="btn-group">
    <button type="button" class="btn btn-lg btn-default dropdown-toggle " data-toggle="dropdown">
     大号
      <span class="caret"></span>          
    </button>
      
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
  
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>    
 
<div class="btn-group">
    <button type="button" class="btn btn btn-default dropdown-toggle " data-toggle="dropdown">
     默认
      <span class="caret"></span>          
    </button>
      
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
  
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>  
 
<div class="btn-group">
    <button type="button" class="btn btn-sm btn-default dropdown-toggle " data-toggle="dropdown">
     小号
      <span class="caret"></span>          
    </button>
      
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
  
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>  
 
<div class="btn-group">
    <button type="button" class="btn btn-xs btn-default dropdown-toggle " data-toggle="dropdown">
     更小
      <span class="caret"></span>          
    </button>
      
    <ul class="dropdown-menu" role="menu">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
  
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>  
  
<div style="height:100px"></div>
edit
按钮大小
示例代码 
<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
<div style="height:150px"></div>

<div class="btn-group dropup">
    <button type="button" class="btn btn-default dropdown-toggle " id="dropdownMenu1" data-toggle="dropdown">
     default
      <span class="caret"></span>          
    </button>
      
    <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
      <li>
         <a href="#">HTML</a>             
      </li>
      <li role="presentation">
         <a href="#">CSS</a>              
      </li>
  
      <li role="presentation">
         <a href="#">Javascript</a>           
      </li>
      <li role="presentation">
         <a href="#">AJAX</a>             
      </li>
    </ul>
</div>
edit
向上弹出式菜单
示例代码
示例 1 : 单按钮下拉菜单   
示例 2 : 分裂式按钮下拉菜单   
示例 3 : 按钮大小   
示例 4 : 向上弹出式菜单   

示例 1 :

单按钮下拉菜单

edit edit 顶 折
纠 问
单按钮下拉菜单
运行效果
<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div class="btn-group"> <button type="button" class="btn btn-default dropdown-toggle " data-toggle="dropdown"> default <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div class="btn-group"> <button type="button" class="btn btn-primary dropdown-toggle " data-toggle="dropdown"> primary <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div class="btn-group"> <button type="button" class="btn btn-success dropdown-toggle " data-toggle="dropdown"> success <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div class="btn-group"> <button type="button" class="btn btn-info dropdown-toggle " data-toggle="dropdown"> info <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div class="btn-group"> <button type="button" class="btn btn-warning dropdown-toggle " data-toggle="dropdown"> warning <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div class="btn-group"> <button type="button" class="btn btn-danger dropdown-toggle " data-toggle="dropdown"> danger <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div style="height:100px"></div>


源代码
1. 双击选中单词 2. 三击选中整行 3. CTRL+F 查找 4. F8 全屏编辑，再次点击恢复
渲染中 渲染完成
效果
示例 2 :

分裂式按钮下拉菜单

edit edit 顶 折
纠 问
分裂式按钮下拉菜单
运行效果
<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.0.3/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div class="btn-group"> <button type="button" class="btn btn-default">默认</button> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown"> <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div style="height:100px"></div>


源代码
1. 双击选中单词 2. 三击选中整行 3. CTRL+F 查找 4. F8 全屏编辑，再次点击恢复
渲染中 渲染完成
效果
示例 3 :

按钮大小

edit edit 顶 折
纠 问
按钮大小
运行效果
<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div class="btn-group"> <button type="button" class="btn btn-lg btn-default dropdown-toggle " data-toggle="dropdown"> 大号 <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div class="btn-group"> <button type="button" class="btn btn btn-default dropdown-toggle " data-toggle="dropdown"> 默认 <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div class="btn-group"> <button type="button" class="btn btn-sm btn-default dropdown-toggle " data-toggle="dropdown"> 小号 <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div class="btn-group"> <button type="button" class="btn btn-xs btn-default dropdown-toggle " data-toggle="dropdown"> 更小 <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div> <div style="height:100px"></div>


源代码
1. 双击选中单词 2. 三击选中整行 3. CTRL+F 查找 4. F8 全屏编辑，再次点击恢复
渲染中 渲染完成
效果
示例 4 :

向上弹出式菜单

edit edit 顶 折
纠 问
向上弹出式菜单
运行效果
<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div style="height:150px"></div> <div class="btn-group dropup"> <button type="button" class="btn btn-default dropdown-toggle " id="dropdownMenu1" data-toggle="dropdown"> default <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1"> <li> <a href="#">HTML</a> </li> <li role="presentation"> <a href="#">CSS</a> </li> <li role="presentation"> <a href="#">Javascript</a> </li> <li role="presentation"> <a href="#">AJAX</a> </li> </ul> </div>


源代码
1. 双击选中单词 2. 三击选中整行 3. CTRL+F 查找 4. F8 全屏编辑，再次点击恢复
渲染中 渲染完成
效果


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关于 前端部分-BootStrap-按钮式下拉菜单 的提问

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