console 命令行工具 X clear

console

document.querySelector('input').onchange = (event) => {
    const file = event.target.files[0];
    console.log(file.type)
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
    <input type="file" accept="image/*,android/force-camera-workaround" capture="environment">
</body>
</html>