Code JavaScript phân tích File Upload

<input type="file" id="fileInput" onchange="handleFile()" />
<div id="fileInfo" style="margin-top: 20px;"></div>
<script>
//<![CDATA[
  function handleFile() {
    const fileInput = document.getElementById('fileInput');
    const fileInfoContainer = document.getElementById('fileInfo');
    const file = fileInput.files[0];
    if (file) {
      const fileInfo = `
            <p><strong>Name:</strong> ${file.name}</p>
            <p><strong>Size:</strong> ${formatFileSize(file.size)}</p>
            <p><strong>Type:</strong> ${file.type}</p>
            <p><strong>Last Modified:</strong> ${formatDate(file.lastModified)}</p>
        `;
      fileInfoContainer.innerHTML = fileInfo;
    } else {
      fileInfoContainer.innerHTML = '<p>No file selected</p>';
    }
  }

  function formatFileSize(size) {
    if (size < 1024) {
      return size + ' B';
    } else if (size < 1024 * 1024) {
      return (size / 1024).toFixed(2) + ' KB';
    } else {
      return (size / (1024 * 1024)).toFixed(2) + ' MB';
    }
  }

  function formatDate(timestamp) {
    const date = new Date(timestamp);
    return date.toLocaleString();
  }
//]]>
</script>