Javascript 如何在iphone safari中检测照片/视频是从相机拍摄还是从相机卷导入的

在我的网站上，我有一个

文件输入

标签来上传照片/视频。 在mobile safari中打开网站时，当我们单击文件输入时，将打开一个操作表，其中包含3个选项

拍照或视频
，
选择现有
和
取消
。
在js中是否仍然可以确定文件是从相机拍摄的（
拍摄照片或视频
），还是从相机卷导入的（
选择现有的
）
 我已经从中实现了一个php解决方案，我不确定这是否会对您有所帮助，但下面是代码：

<?php

$camera = cameraUsed("C:\Users\Ale\Pictures\sep7imodia.jpg");
echo "Camera Used: " . $camera['make'] . " " . $camera['model'] . "<br />";
echo "Exposure Time: " . $camera['exposure'] . "<br />";
echo "Aperture: " . $camera['aperture'] . "<br />";
echo "ISO: " . $camera['iso'] . "<br />";
echo "Date Taken: " . $camera['date'];

// This function is used to determine the camera details for a specific image. It returns an array with the parameters.

function cameraUsed($imagePath) {

// Check if the variable is set and if the file itself exists before continuing
if ((isset($imagePath)) and (file_exists($imagePath))) {

  // There are 2 arrays which contains the information we are after, so it's easier to state them both
  $exif_ifd0 = read_exif_data($imagePath ,'IFD0' ,0);      
  $exif_exif = read_exif_data($imagePath ,'EXIF' ,0);

  //error control
  $notFound = "Unavailable";

  // Make
  if (@array_key_exists('Make', $exif_ifd0)) {
    $camMake = $exif_ifd0['Make'];
  } else { $camMake = $notFound; }

  // Model
  if (@array_key_exists('Model', $exif_ifd0)) {
    $camModel = $exif_ifd0['Model'];
  } else { $camModel = $notFound; }

  // Exposure
  if (@array_key_exists('ExposureTime', $exif_ifd0)) {
    $camExposure = $exif_ifd0['ExposureTime'];
  } else { $camExposure = $notFound; }

  // Aperture
  if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED'])) {
    $camAperture = $exif_ifd0['COMPUTED']['ApertureFNumber'];
  } else { $camAperture = $notFound; }

  // Date
  if (@array_key_exists('DateTime', $exif_ifd0)) {
    $camDate = $exif_ifd0['DateTime'];
  } else { $camDate = $notFound; }

  // ISO
  if (@array_key_exists('ISOSpeedRatings',$exif_exif)) {
    $camIso = $exif_exif['ISOSpeedRatings'];
  } else { $camIso = $notFound; }

  $return = array();
  $return['make'] = $camMake;
  $return['model'] = $camModel;
  $return['exposure'] = $camExposure;
  $return['aperture'] = $camAperture;
  $return['date'] = $camDate;
  $return['iso'] = $camIso;
  return $return;

} else {
  return false;
}
}

?>

您可以使用类似于库的方法来检查元数据吗？如果是在最后几秒钟拍的，你可以假设是手机拍的。只是个主意。