216-手机h5实现关闭手机前置摄像头，代码实现

navigator.mediaDevices.getUserMedia({ video: { facingMode: 'user' } })
  .then(function (stream) {
    const cameraPreview = document.getElementById('cameraPreview');
    cameraPreview.srcObject = stream;
    cameraStream = stream;
  })
  .catch(function (error) {
    console.error('Error accessing the camera:', error);
  });

const stopCameraButton = document.getElementById('stopCameraButton');
stopCameraButton.addEventListener('click', function () {
  if (cameraStream) {
    const tracks = cameraStream.getTracks();
    tracks.forEach(track => track.stop());
    cameraStream = null;
    const cameraPreview = document.getElementById('cameraPreview');
    cameraPreview.srcObject = null;
  }
});  

点击按钮时实现拍照逻辑，并将突破上传，代码实现

const captureButton = document.getElementById('captureButton');
captureButton.addEventListener('click', function () {
  const cameraPreview = document.getElementById('cameraPreview');
  const canvas = document.getElementById('canvas');
  const context = canvas.getContext('2d');

  // Set canvas dimensions to match camera preview
  canvas.width = cameraPreview.videoWidth;
  canvas.height = cameraPreview.videoHeight;

  // Draw camera preview onto canvas
  context.drawImage(cameraPreview, 0, 0, canvas.width, canvas.height);

  // Convert canvas content to image data (JPEG format)
  const imageDataURL = canvas.toDataURL('image/jpeg');

  // Upload the image data (this is a placeholder URL)
  uploadImage(imageDataURL);
});

function uploadImage(imageDataURL) {
  // Here you can implement the logic to upload the image data
  // to your server or cloud storage
  console.log('Uploading image:', imageDataURL);
}