Scription recording

<script type="text/javascript">
		var recorder;
		const record = async() =>{
				let localStream
			    try {
			      localStream = await navigator.mediaDevices.getUserMedia({
			        audio: true
			      })
			    } catch (error) {
			      console.log(error)
			    }

				recorder = new MediaRecorder(localStream);
	            recorder.start();
		}
		const stopRecord = () => {
			//
	        recorder.stop();
			recorder.ondataavailable = function(e) {
	            var url = URL.createObjectURL(e.data);
	            var preview = document.querySelector('audio');
	            preview.autoplay = true;
	            preview.src = url;
	            // http call
	            console.log(e.data, url);
	        };
		}
		document.querySelector('button').addEventListener('mouseup', stopRecord);
		document.querySelector('button').addEventListener('mousedown', record);
		
		/// stop record
		stream.getTracks().forEach(function(track) {
		  track.stop();
		});
	</script>