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console 命令行工具 X clear 

                    

                        
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console

            
<section class="row">
<div style ="background-color:yellow;" class="col-md-3 colxs-sm-3 col-xs-offset-3 ">左边
<section class="row">
<div class="col-xs-6">1</div>
<div class="col-xs-6">2</div>
</section>
</div>
<div style ="background-color:orange;" class="col-md-6 colxs-sm-9">中间
  <section class="row">
    <div class="col-xs-6">3</div>
    <div class="col-xs-6">3</div>
  </section>
  
  </div>
<div style ="background-color:red;"class="col-md-3 colxs-sm-12">右边</div>
</section>

            

                
本项目引用的自定义外部资源