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console 命令行工具 X clear 

                    

                        
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console

            
<div></div>

            
div{
    background-position: -0px -2px;
    display: block;
    width: 16px;
    height: 16px;
    background-image: url('https://gss0.baidu.com/94o3dSag_xI4khGko9WTAnF6hhy/zhidao/wh%3D450%2C600/sign=9b857908de62853592b5da25a5df5af0/9922720e0cf3d7ca7b1e3c8cf91fbe096a63a95b.jpg')
}