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navigator.mediaDevices.getUserMedia({
  video: {
    width: { min: 640, ideal: 1280, max: 1920 },
    height: { min: 480, ideal: 720, max: 1080 }
  }
})
.then(function(stream) {
  // 澶勭悊瑙嗛娴?/span>
})
.catch(function(error) {
  console.log('璁块棶鎽勫儚澶村け璐? ', error);
});

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