<div class="form-horizontal"> <form method="post" action=""> <div class="form-group"> <label for="lastname" class="col-xs-3 control-label">姓</label> <div class="col-md-3 col-xs-7"> <input type="text" class="form-control input-sm" name="lastname" id="lastname" placeholder="姓"> </div> </div> <div class="form-group"> <label for="firstname" class="col-xs-3 control-label">名</label> <div class="col-md-3