Bootstrap3的输入框数字点击修改效果

<div class="container">
<div class="page-header"><h3>Bootstrap 3 输入框数字修改效果</h3></div>  
  <div class="input-group spinner">
    <input type="text" class="form-control" value="1000">
    <div class="input-group-btn-vertical">
      <button class="btn btn-default" type="button"><i class="fa fa-caret-up"></i></button>
      <button class="btn btn-default" type="button"><i class="fa fa-caret-down"></i></button>
    </div>
  </div>
</div>

<!-- 推荐开源CDN来选取需引用的外部JS //-->
<script type="text/javascript" src="http://cdn.gbtags.com/jquery/1.11.1/jquery.min.js"></script>

/*CSS源代码*/
@import url('http://cdn.gbtags.com/twitter-bootstrap/3.2.0/css/bootstrap.min.css');
@import url('http://cdn.gbtags.com/font-awesome/4.1.0/css/font-awesome.min.css');

body{
    background:orange;
    font-family: 'microsoft yahei',Arial,sans-serif;
    color:#FFF;
}

.spinner {
  width: 200px;
}
.spinner input {
  text-align: right;
}
.input-group-btn-vertical {
  position: relative;
  white-space: nowrap;
  width: 1%;
  vertical-align: middle;
  display: table-cell;
}
.input-group-btn-vertical > .btn {
  display: block;
  float: none;
  width: 100%;
  max-width: 100%;
  padding: 8px;
  margin-left: -1px;
  position: relative;
  border-radius: 0;
}
.input-group-btn-vertical > .btn:first-child {
  border-top-right-radius: 4px;
}
.input-group-btn-vertical > .btn:last-child {
  margin-top: -2px;
  border-bottom-right-radius: 4px;
}
.input-group-btn-vertical i{
  position: absolute;
  top: 0;
  left: 4px;
}

/*Javascript代码片段*/

(function ($) {
  $('.spinner .btn:first-of-type').on('click', function() {
    $('.spinner input').val( parseInt($('.spinner input').val(), 10) + 1);
  });
  $('.spinner .btn:last-of-type').on('click', function() {
    $('.spinner input').val( parseInt($('.spinner input').val(), 10) - 1);
  });
})(jQuery);