<form role="form"> 
   <div class="form-group">
    <label for="name">名称</label> 
    <input type="text" class="form-control" id="name" 
      placeholder="请输入名称">
    </div>
   <div class="form-group">
     <label for="inputfile">文件输入</label>
     <input type="file" id="inputfile">
     <p class="help-block">这里是块级帮助文本的实例。</p>
   </div>
   <div class="checkbox">
    <label>
     <input type="checkbox"> 请打勾 
    </label> 
   </div>
    <button type="submit" class="btn btn-default">提交</button>
   </form>

 <form class="form-inline" role="form"> 
   <div class="form-group">
     <label class="sr-only" for="name">名称</label>
    <input type="text" class="form-control" id="name"
      placeholder="请输入名称">
    </div>
   <div class="form-group">
    <label class="sr-only" for="inputfile">文件输入</label>
    <input type="file" id="inputfile"> 
   </div>
    <div class="checkbox">
     <label>
      <input type="checkbox"> 请打勾
     </label>
    </div>
   <button type="submit" class="btn btn-default">提交</button>
  </form> 

<form class="form-horizontal" role="form">
    <div class="form-group"> 
    <label for="firstname" class="col-sm-2 control-label">名字</label> 
    <div class="col-sm-10">
      <input type="text" class="form-control" id="firstname"
       placeholder="请输入名字">
    </div>
    </div> 
   <div class="form-group"> 
    <label for="lastname" class="col-sm-2 control-label">姓</label> 
    <div class="col-sm-10">
     <input type="text" class="form-control" id="lastname"
       placeholder="请输入姓">
     </div>
    </div>
    <div class="form-group">
    <div class="col-sm-offset-2 col-sm-10">
      <div class="checkbox">
      <label>
        <input type="checkbox"> 请记住我
       </label> 
     </div>
     </div>
   </div>
    <div class="form-group">
     <div class="col-sm-offset-2 col-sm-10">
      <button type="submit" class="btn btn-default">登录</button>
    </div>
   </div>
   </form>