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                            ```js
let audioCtx = new AudioContext();
let destination = audioCtx.createMediaStreamDestination();
var output = new MediaStream();
let micable = false;
let micsource = ''
navigator.mediaDevices.getUserMedia({
                audio: {
                    deviceId: '999'
                }
            })
.then(function(mic) {
    micable = !0;
    micsource = audioCtx.createMediaStreamSource(mic);
})
.catch(function(error) {
    micable = !1;
})
navigator.mediaDevices.getDisplayMedia({
        audio: !0,
        video: !0
    }).then(function(stream) {
        output = new MediaStream();
        if (micable) {
            micsource.connect(destination);
            output.addTrack(destination.stream.getAudioTracks()[0])
        }
        output.addTrack(stream.getVideoTracks()[0]);
        newRecording(output);
        stream.getVideoTracks()[0].onended = function() {
            console.log('暫停')
        }
})
quality = 'max'
function newRecording(stream) {
    if (quality == "max") {
        mediaConstraints = {
            mimeType: 'video/webm;codecs=vp8,opus'
        }
    } else {
        mediaConstraints = {
            mimeType: 'video/webm;codecs=vp8,opus',
            bitsPerSecond: 1000
        }
    }
    mediaRecorder = new MediaRecorder(stream, mediaConstraints);
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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