<h1>默认表单</h1>

     <form action="#">

         <div class="form-group">

             <label for="uname" class="control-label">用户名</label>

             <input type="text" id="uname" class="form-control">

             <span class="help-block">字母下划线3-8位</span>

         </div>

         <div class="form-group">

             <label for="upwd" class="control-label">密码</label>

             <input type="password" id="upwd" class="form-control">

             <span class="help-block">密码为6-8位</span>

         </div>

         <div class="form-group">

             <div class="checkbox">

             <label><input type="checkbox">七天免密登陆</label>

             </div>

         </div>

         <div class="form-group">

             <input type="button" id="login" value="登录" class="btn btn-success">

             <input type="button" id="logout" value="取消" class="btn btn-danger">

         </div>

     </form>

  <h1>行内表单</h1>

     <h3> Screen Reader Only sr-only</h3>

     <form action="#" class="form-inline">

         <div class="form-group">

             <label for="uname1" class="sr-only"> 用户名</label>

             <input class="form-control" type="text" placeholder="请输入用户名" id="uname1">

         </div>

         <div class="form-group">

             <lable for="upwd1" class="sr-only">密码</lable>

             <input class="form-control" type="password" placeholder="请输入密码" id="upwd1">

         </div>

         <div class="form-group"><input type="button" value="登陆" class="btn btn-success"></div>

     </form>