SOURCE

console 命令行工具 X clear 

                    

                        
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console

            
function full() {
    document.querySelector('.sss').style = 'position:fixed;left:0;right:0;top:0;0;height:100vw;width:100vh;background-color: #000;';
    document.querySelector('video').style = 'transform: rotate(90deg);max-height:100vw;max-width:100vh;height: 100vw;width:100vh;';
}

            
<div class="sss">
    <video src="https://bms-1257123484.cos.ap-shanghai.myqcloud.com/bms/knowledge/0fe329d8a93c404e8ddd41f66ba4da63.mp4" controls></video>
</div>

<button onclick="full()">测试</button>