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console 命令行工具 X clear 

                    

                        
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console

            
<div id="demo-1">
  <div class="parent"><span class="child">Lorem ipsum dolor sit amet, consectetur adipisicing elit.</span></div>
</div>
<div id="demo-2">
  <div class="parent">
    <div class="child">Lorem ipsum dolor sit amet, consectetur adipisicing elit.</div>
  </div>
</div>

            
#demo-1 {
  .parent {
    text-align: center;
  }
}