在文件上传中使用 accept 属性，本例中的输入字段可以接受 GIF 和 JPEG 两种图像：

accept="image/gif, image/jpeg" />

亲自试一试 如果不限制图像的格式，可以写为：accept="image/*"。

定义和用法

accept 属性只能与 配合使用。它规定能够通过文件上传进行提交的文件类型。 提示：请避免使用该属性。应该在服务器端验证文件上传。

语法

value">

属性值

值 描述 MIME_type 用逗号隔开的 MIME 类型列表。  

MIME 类型

MIME (Multipurpose Internet Mail Extensions) 是描述消息内容类型的因特网标准。 MIME 消息能包含文本、图像、音频、视频以及其他应用程序专用的数据。 官方的 MIME 信息是由 Internet Engineering Task Force (IETF) 在下面的文档中提供的：

• RFC-822 Standard for ARPA Internet text messages
• RFC-2045 MIME Part 1: Format of Internet Message Bodies
• RFC-2046 MIME Part 2: Media Types
• RFC-2047 MIME Part 3: Header Extensions for Non-ASCII Text
• RFC-2048 MIME Part 4: Registration Procedures
• RFC-2049 MIME Part 5: Conformance Criteria and Examples

不同的应用程序支持不同的 MIME 类型。 下面的参考手册是由 Microsoft Internet Information Server version 5 所支持的 MIME 类型列表。

按照内容类型排列的 Mime 类型列表

类型/子类型 扩展名 application/envoy evy application/fractals fif application/futuresplash spl application/hta hta application/internet-property-stream acx application/mac-binhex40 hqx application/msword doc application/msword dot application/octet-stream * application/octet-stream bin application/octet-stream class application/octet-stream dms application/octet-stream exe application/octet-stream lha application/octet-stream lzh application/oda oda application/olescript axs application/pdf pdf application/pics-rules prf application/pkcs10 p10 application/pkix-crl crl application/postscript ai application/postscript eps application/postscript ps application/rtf rtf application/set-payment-initiation setpay application/set-registration-initiation setreg application/vnd.ms-excel xla application/vnd.ms-excel xlc application/vnd.ms-excel xlm application/vnd.ms-excel xls application/vnd.ms-excel xlt application/vnd.ms-excel xlw application/vnd.ms-outlook msg application/vnd.ms-pkicertstore sst application/vnd.ms-pkiseccat cat application/vnd.ms-pkistl stl application/vnd.ms-powerpoint pot application/vnd.ms-powerpoint pps application/vnd.ms-powerpoint ppt application/vnd.ms-project mpp application/vnd.ms-works wcm application/vnd.ms-works wdb application/vnd.ms-works wks application/vnd.ms-works wps application/winhlp hlp application/x-bcpio bcpio application/x-cdf cdf application/x-compress z application/x-compressed tgz application/x-cpio cpio application/x-csh csh application/x-director dcr application/x-director dir application/x-director dxr application/x-dvi dvi application/x-gtar gtar application/x-gzip gz application/x-hdf hdf application/x-internet-signup ins application/x-internet-signup isp application/x-iphone iii application/x-javascript js application/x-latex latex application/x-msaccess mdb application/x-mscardfile crd application/x-msclip clp application/x-msdownload dll application/x-msmediaview m13 application/x-msmediaview m14 application/x-msmediaview mvb application/x-msmetafile wmf application/x-msmoney mny application/x-mspublisher pub application/x-msschedule scd application/x-msterminal trm application/x-mswrite wri application/x-netcdf cdf application/x-netcdf nc application/x-perfmon pma application/x-perfmon pmc application/x-perfmon pml application/x-perfmon pmr application/x-perfmon pmw application/x-pkcs12 p12 application/x-pkcs12 pfx application/x-pkcs7-certificates p7b application/x-pkcs7-certificates spc application/x-pkcs7-certreqresp p7r application/x-pkcs7-mime p7c application/x-pkcs7-mime p7m application/x-pkcs7-signature p7s application/x-sh sh application/x-shar shar application/x-shockwave-flash swf application/x-stuffit sit application/x-sv4cpio sv4cpio application/x-sv4crc sv4crc application/x-tar tar application/x-tcl tcl application/x-tex tex application/x-texinfo texi application/x-texinfo texinfo application/x-troff roff application/x-troff t application/x-troff tr application/x-troff-man man application/x-troff-me me application/x-troff-ms ms application/x-ustar ustar application/x-wais-source src application/x-x509-ca-cert cer application/x-x509-ca-cert crt application/x-x509-ca-cert der application/ynd.ms-pkipko pko application/zip zip audio/basic au audio/basic snd audio/mid mid audio/mid rmi audio/mpeg mp3 audio/x-aiff aif audio/x-aiff aifc audio/x-aiff aiff audio/x-mpegurl m3u audio/x-pn-realaudio ra audio/x-pn-realaudio ram audio/x-wav wav image/bmp bmp image/cis-cod cod image/gif gif image/ief ief image/jpeg jpe image/jpeg jpeg image/jpeg jpg image/pipeg jfif image/svg+xml svg image/tiff tif image/tiff tiff image/x-cmu-raster ras image/x-cmx cmx image/x-icon ico image/x-portable-anymap pnm image/x-portable-bitmap pbm image/x-portable-graymap pgm image/x-portable-pixmap ppm image/x-rgb rgb image/x-xbitmap xbm image/x-xpixmap xpm image/x-xwindowdump xwd message/rfc822 mht message/rfc822 mhtml message/rfc822 nws text/css css text/h323 323 text/html htm text/html html text/html stm text/iuls uls text/plain bas text/plain c text/plain h text/plain txt text/richtext rtx text/scriptlet sct text/tab-separated-values tsv text/webviewhtml htt text/x-component htc text/x-setext etx text/x-vcard vcf video/mpeg mp2 video/mpeg mpa video/mpeg mpe video/mpeg mpeg video/mpeg mpg video/mpeg mpv2 video/quicktime mov video/quicktime qt video/x-la-asf lsf video/x-la-asf lsx video/x-ms-asf asf video/x-ms-asf asr video/x-ms-asf asx video/x-msvideo avi video/x-sgi-movie movie x-world/x-vrml flr x-world/x-vrml vrml x-world/x-vrml wrl x-world/x-vrml wrz x-world/x-vrml xaf x-world/x-vrml xof

按照文件扩展名排列的 Mime 类型列表

扩展名 类型/子类型   application/octet-stream 323 text/h323 acx application/internet-property-stream ai application/postscript aif audio/x-aiff aifc audio/x-aiff aiff audio/x-aiff asf video/x-ms-asf asr video/x-ms-asf asx video/x-ms-asf au audio/basic avi video/x-msvideo axs application/olescript bas text/plain bcpio application/x-bcpio bin application/octet-stream bmp image/bmp c text/plain cat application/vnd.ms-pkiseccat cdf application/x-cdf cer application/x-x509-ca-cert class application/octet-stream clp application/x-msclip cmx image/x-cmx cod image/cis-cod cpio application/x-cpio crd application/x-mscardfile crl application/pkix-crl crt application/x-x509-ca-cert csh application/x-csh css text/css dcr application/x-director der application/x-x509-ca-cert dir application/x-director dll application/x-msdownload dms application/octet-stream doc application/msword dot application/msword dvi application/x-dvi dxr application/x-director eps application/postscript etx text/x-setext evy application/envoy exe application/octet-stream fif application/fractals flr x-world/x-vrml gif image/gif gtar application/x-gtar gz application/x-gzip h text/plain hdf application/x-hdf hlp application/winhlp hqx application/mac-binhex40 hta application/hta htc text/x-component htm text/html html text/html htt text/webviewhtml ico image/x-icon ief image/ief iii application/x-iphone ins application/x-internet-signup isp application/x-internet-signup jfif image/pipeg jpe image/jpeg jpeg image/jpeg jpg image/jpeg js application/x-javascript latex application/x-latex lha application/octet-stream lsf video/x-la-asf lsx video/x-la-asf lzh application/octet-stream m13 application/x-msmediaview m14 application/x-msmediaview m3u audio/x-mpegurl man application/x-troff-man mdb application/x-msaccess me application/x-troff-me mht message/rfc822 mhtml message/rfc822 mid audio/mid mny application/x-msmoney mov video/quicktime movie video/x-sgi-movie mp2 video/mpeg mp3 audio/mpeg mpa video/mpeg mpe video/mpeg mpeg video/mpeg mpg video/mpeg mpp application/vnd.ms-project mpv2 video/mpeg ms application/x-troff-ms mvb application/x-msmediaview nws message/rfc822 oda application/oda p10 application/pkcs10 p12 application/x-pkcs12 p7b application/x-pkcs7-certificates p7c application/x-pkcs7-mime p7m application/x-pkcs7-mime p7r application/x-pkcs7-certreqresp p7s application/x-pkcs7-signature pbm image/x-portable-bitmap pdf application/pdf pfx application/x-pkcs12 pgm image/x-portable-graymap pko application/ynd.ms-pkipko pma application/x-perfmon pmc application/x-perfmon pml application/x-perfmon pmr application/x-perfmon pmw application/x-perfmon pnm image/x-portable-anymap pot, application/vnd.ms-powerpoint ppm image/x-portable-pixmap pps application/vnd.ms-powerpoint ppt application/vnd.ms-powerpoint prf application/pics-rules ps application/postscript pub application/x-mspublisher qt video/quicktime ra audio/x-pn-realaudio ram audio/x-pn-realaudio ras image/x-cmu-raster rgb image/x-rgb rmi audio/mid roff application/x-troff rtf application/rtf rtx text/richtext scd application/x-msschedule sct text/scriptlet setpay application/set-payment-initiation setreg application/set-registration-initiation sh application/x-sh shar application/x-shar sit application/x-stuffit snd audio/basic spc application/x-pkcs7-certificates spl application/futuresplash src application/x-wais-source sst application/vnd.ms-pkicertstore stl application/vnd.ms-pkistl stm text/html svg image/svg+xml sv4cpio application/x-sv4cpio sv4crc application/x-sv4crc swf application/x-shockwave-flash t application/x-troff tar application/x-tar tcl application/x-tcl tex application/x-tex texi application/x-texinfo texinfo application/x-texinfo tgz application/x-compressed tif image/tiff tiff image/tiff tr application/x-troff trm application/x-msterminal tsv text/tab-separated-values txt text/plain uls text/iuls ustar application/x-ustar vcf text/x-vcard vrml x-world/x-vrml wav audio/x-wav wcm application/vnd.ms-works wdb application/vnd.ms-works wks application/vnd.ms-works wmf application/x-msmetafile wps application/vnd.ms-works wri application/x-mswrite wrl x-world/x-vrml wrz x-world/x-vrml xaf x-world/x-vrml xbm image/x-xbitmap xla application/vnd.ms-excel xlc application/vnd.ms-excel xlm application/vnd.ms-excel xls application/vnd.ms-excel xlt application/vnd.ms-excel xlw application/vnd.ms-excel xof x-world/x-vrml xpm image/x-xpixmap xwd image/x-xwindowdump z application/x-compress zip application/zip