我们支持的文件有:'image/jpeg', 'image/png', 'application/pdf','image/jpg','image/gif','image/bmp','image/x-icon','audio/mpeg','application/msword','application/x-x509-ca-cert','text/xml','audio/wav','application/x-msdownload','text/html','application/x-zip-compressed','application/vnd.openxmlformats-officedocument.wordprocessingml.document','video/mp4','application/vnd.openxmlformats-officedocument.spreadsheetml.sheet','application/zip','application/java-archive','application/octet-stream','text/rtf'