master Bedroom，HTML/Vue代码在线实时编辑、预览

            
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            <div class="container">
  <div class="item item1">1</div>
  <div class="item item2">2</div>
  <div class="item item3">3</div>
  <div class="item item4">4</div>
  <div class="item item5">5</div>
  <div class="item item6">6</div>
  <div class="item item7">7</div>
  <div class="item item8">8</div>
  <div class="item item9">9</div>
  <div class="item item10">10</div>
  <div class="item item11">11</div>
  <div class="item item12">12</div>
  <div class="item item13">13</div>
  <div class="item item14">14</div>
  <div class="item item15">15</div>
  <div class="item item16">16</div>
  <div class="item item17">17</div>
  <div class="item item18">18</div>
</div>