做一个bootstrap栅格程序每个格子间设有间隔，要求第一行一列格子，第二行两列格子，第三行三列格子，第四行四列格子，第五行六列格子，第六行十二列格子，

以下是一个满足要求的Bootstrap栅格程序，每个格子间设有间隔：

<div class="container">
  <div class="row">
    <div class="col-md-1 col-sm-1 col-xs-1">1</div>
  </div>
  <div classrow">
    <div class="col-md-6 col-sm-6 col-xs-6">2</div>
    <div class="col-md-6 col-sm-6 col-xs-6">2</div>
  </div>
  <div class="row">
    <div class="col-md-4 col-sm-4 col-xs-4">3</div>
    <div class="col-md-4 col-sm-4 col-xs-4">3</div>
    <div class="col-md-4 col-sm-4 col-xs-4">3</div>
  </div>
  <div class="row">
    <div class="col-md-3 col-sm-3 col-xs-3">4</div>
    <div class="col-md-3 col-sm-3 col-xs-3">4</div>
    <div class="col-md-3 col-sm-3 col-xs-3">4</div>
    <div class="col-md-3 col-sm-3 col-xs-3">4</div>
  </div>
  <div class="row">
    <div class="col-md-2 col-sm-2 col-xs-2">6</div>
    <div class="col-md-2 col-sm-2 col-xs-2">6</div>
    <div class="col-md-2 col-sm-2 col-xs-2">6</div>
    <div class="col-md-2 col-sm-2 col-xs-2">6</div>
    <div class="col-md-2 col-sm-2 col-xs-2">6</div>
    <div class="col-md-2 col-sm-2 col-xs-2">6</div>
  </div>
  <div class="row">
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
    <div class="col-md-1 col-sm-1 col-xs-1">12</div>
  </div>
</div>