JS 上传文件--获取视频文件宽高``` ```

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <input type="file" id="fileButton">
  <script>
    fileButton.addEventListener('change', evt => {
      const file = fileButton.files[0]
      const url = URL.createObjectURL(file)
      const video = document.createElement('video')
      video.onloadedmetadata = evt => {
        // Revoke when you don't need the url any more to release any reference
        URL.revokeObjectURL(url)
        console.log(video.videoWidth, video.videoHeight)
      }
      video.src = url
      video.load() // fetches metadata
    })
  </script>
</body>
</html>