canvas绘制动态视频并且在视频上加上自定义logo

实现的效果：可以在画布上播放动态视频，并且加上自定义的图片logo放在视频的右下角

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>绘制视频</title>
    </head>
    <body>
        <div>绘制视频</div>
        <canvas id="myCanvas" width="500" height="350"></canvas>
        <button id="player" style="display: block">暂停/播放</button>

        <script>
            // 获取画布
            const canvas = document.getElementById('myCanvas')
            // 获取画笔
            const ctx = canvas.getContext('2d')
            // 获取视频
            // const video = document.querySelector('video')
            const video = document.createElement('video')
            video.src = './assets/video.mp4'
            const logo = new Image()
            logo.src = './assets/ball.png'

            // 获取按钮
            const btn = document.querySelector('#player')
            btn.onclick = () => {
                // 判断视频是否在播放
                if (video.paused) {
                    video.play()
                } else {
                    video.pause()
                }
                renderVideo()
            }
            // 绘制视频
            const renderVideo = () => {
                // 绘制视频
                ctx.drawImage(video, 0, 0, 500, 350)
                // 还可以继续绘制一个logo
                // ctx.drawImage(logo, 460, 320, 40, 30)
                requestAnimationFrame(renderVideo)
            }
        </script>
    </body>
</html>