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console 命令行工具 X clear 

                    

                        
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console

            
<div class="san"></div>

            
    *{margin: 0;padding: 0}
    body{ background: #000}
    .san{width: 310px;height: 384px;background: url(https://img4.99.com/zf/2019/02/newoccupation/img/san-01.png) no-repeat;animation: flash_light 4s infinite; background-size: 100%}
    @-webkit-keyframes flash_light {
        0% {height: 0;opacity: .5}
        7.5% { height:384px;}
        8%,12%,16% {opacity: .5}
        10%,14% {opacity: 1}
        50% {opacity: 0}
        100% {height: 384px;opacity: 0}
}