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录屏+麦克风.html

<!DOCTYPE html>
<html lang="cmn">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>录屏+麦克风</title>
</head>

<body>
    <button id="btn_start">开始录制</button>
    <button id="btn_stop">停止录制</button>
    <script>
        let recoder;
        // 监听开始录制按钮
        document.getElementById("btn_start").addEventListener("click", async () => {
            // 获取视频流和麦克风音频流
            let videoStream = await navigator.mediaDevices.getDisplayMedia({ video: true });
            let audioStream = await navigator.mediaDevices.getUserMedia({ audio: true });
            // 合并视频轨和音频轨，实例化成媒体流
            let tracks = [];
            videoStream.getVideoTracks().forEach(t => tracks.push(t));
            audioStream.getAudioTracks().forEach(t => tracks.push(t));
            let stream = new MediaStream(tracks);
            // 录制媒体流
            recoder = new MediaRecorder(stream);
            // 存入媒体流
            let data = [];
            recoder.ondataavailable = function (e) {
                data.push(e.data);
            }
            // 停止录制的执行事件
            recoder.onstop = function () {
                // 关闭录制窗口
                this.stream.getTracks().forEach(track => track.stop());
                // 视频数据转换成Blob对象
                let blob = new Blob(data, { type: this.mimeType });
                // 创建链接并模拟点击下载
                let link = document.createElement("a");
                link.href = URL.createObjectURL(blob);
                link.downloaded = new Date().getTime() + ".webm";
                document.body.appendChild(link);
                link.click();
                // 释放占用内存资源
                URL.revokeObjectURL(link.href);
                link.remove();
            }
            // 开始录制
            recoder.start();
        })

        // 监听停止录制按钮
        document.getElementById("btn_stop").addEventListener("click", function () {
            recoder.stop();
        })
    </script>
</body>

</html>