Javascript 如何使用navigator.getUserMedia停止在浏览器中列出音频

我在navigator.getUserMedia的帮助下从浏览器录制音频，我的代码是

   if (!navigator.getUserMedia)
            navigator.getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
        if (!navigator.cancelAnimationFrame)
            navigator.cancelAnimationFrame = navigator.webkitCancelAnimationFrame || navigator.mozCancelAnimationFrame;
        if (!navigator.requestAnimationFrame)
            navigator.requestAnimationFrame = navigator.webkitRequestAnimationFrame || navigator.mozRequestAnimationFrame;

    navigator.getUserMedia(
        {
            "audio": {
                "mandatory": {
                    "googEchoCancellation": "false",
                    "googAutoGainControl": "false",
                    "googNoiseSuppression": "false",
                    "googHighpassFilter": "false"
                },
                "optional": []
            },
        }, gotStream, function(e) {
            alert('Error getting audio');
            console.log(e);
        });

它工作正常，但我可能想在一段时间后停止列出浏览器音频，我该如何做？

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