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console 命令行工具 X clear 

                    

                        
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console

            
<div class="container">
  <img src="xxx.img" alt="" />
</div>

            
.container {
  width: 100%;
  background: red;
  height: 0;
  padding-top: 100%;
  padding-bottom: 100%;
}

img {
  /* position: absolute; */
  /* height: 100%; */
  /* width: 100%; */
}