rainyjune/gist:6a3ed9de500f95b705cd578ceb37aeed

## gistfile1.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>getUserMedia</title>
  </head>
  <body>
    <video id="camera"></video>
    <script>
      document.addEventListener('DOMContentLoaded', onDOMContentLoaded, false);
      function onDOMContentLoaded() {
        console.log('DOMContentLoaded');
        if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
          alert('Sorry, your browser does not support getUserMedia()');
          return false;
        }
        var constraints = { audio: true, video: true };
        navigator.mediaDevices.getUserMedia(constraints).then(function(mediaStream) {
          debugger;
          var video = document.querySelector('#camera');
          video.srcObject = mediaStream;
          video.onloadedmetadata = function() {
            video.play();
          };
          /* use the stream */
        }).catch(handleGetUserMediaError);
      }

      function handleGetUserMediaError(err){
        /* handle the error */
        switch (err.name) {
          case 'PermissionDeniedError':
            alert('Permission Denied');
            break;
          case 'AbortError':
            alert('Aborted, some problem occurred which prevented the device from being used');
            break;
          case 'NotAllowedError':
            alert('Operation not allowed');
            break;
          case 'NotFoundError':
            alert('No media tracks of the type specified were found that satisfy the given constraints.');
            break;
          case 'NotReadableError':
            alert('An error occurred which prevented access to the device');
            break;
          case 'OverConstrainedError':
            alert('The specified constraints resulted in no candidate devices which met the criteria requested');
            break;
          case 'SecurityError':
            alert('User media support is disabled');
            break;
          case 'TypeError':
            alert('The list of constraints specified is empty, or has all constraints set to false.');
            break;
          default:
            alert('Unknown Error');
        }
      }
    </script>
  </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8" />
	<title>getUserMedia</title>
	</head>
	<body>
	<video id="camera"></video>
	<script>
	document.addEventListener('DOMContentLoaded', onDOMContentLoaded, false);
	function onDOMContentLoaded() {
	console.log('DOMContentLoaded');
	if (!navigator.mediaDevices \|\| !navigator.mediaDevices.getUserMedia) {
	alert('Sorry, your browser does not support getUserMedia()');
	return false;
	}
	var constraints = { audio: true, video: true };
	navigator.mediaDevices.getUserMedia(constraints).then(function(mediaStream) {
	debugger;
	var video = document.querySelector('#camera');
	video.srcObject = mediaStream;
	video.onloadedmetadata = function() {
	video.play();
	};
	/* use the stream */
	}).catch(handleGetUserMediaError);
	}

	function handleGetUserMediaError(err){
	/* handle the error */
	switch (err.name) {
	case 'PermissionDeniedError':
	alert('Permission Denied');
	break;
	case 'AbortError':
	alert('Aborted, some problem occurred which prevented the device from being used');
	break;
	case 'NotAllowedError':
	alert('Operation not allowed');
	break;
	case 'NotFoundError':
	alert('No media tracks of the type specified were found that satisfy the given constraints.');
	break;
	case 'NotReadableError':
	alert('An error occurred which prevented access to the device');
	break;
	case 'OverConstrainedError':
	alert('The specified constraints resulted in no candidate devices which met the criteria requested');
	break;
	case 'SecurityError':
	alert('User media support is disabled');
	break;
	case 'TypeError':
	alert('The list of constraints specified is empty, or has all constraints set to false.');
	break;
	default:
	alert('Unknown Error');
	}
	}
	</script>
	</body>
	</html>