// 文件类型枚举
const FileTypeEnum = {
  JPEG: 'image/jpeg',
  JPG: 'image/jpg',
  PNG: 'image/png',
  GIF: 'image/gif',
  SVG: 'image/svg+xml',
  MP4: 'video/mp4',
  AVI: 'video/x-msvideo',
  MOV: 'video/quicktime',
  MKV: 'video/x-matroska',
  WMV: 'video/x-ms-wmv',
  PDF: 'application/pdf',
  DOC: 'application/msword',
  DOCX: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
  XLS: 'application/vnd.ms-excel',
  XLSX: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
  PPT: 'application/vnd.ms-powerpoint',
  PPTX: 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
  TXT: 'text/plain',
  CSV: 'text/csv',
  JSON: 'application/json',
  XML: 'application/xml',
  ZIP: 'application/zip',
  RAR: 'application/x-rar-compressed',
  MP3: 'audio/mpeg',
  WAV: 'audio/wav',
  OGG: 'audio/ogg'
};