FileUpload系列：（4）HTML5的 input:f

网页上添加一个input file HTML控件：

默认情况下，所有文件类型都会显示出来，如果想限制它只显示特定的文件类型呢，比如"word","excel","pdf"文件　

解决办法是可以给它添加一个accept属性，比如：

还有另外一种形式：

accept属性列表

多个类型用逗号分隔开,因为accept是html5的新特性，所以火狐和IE的支持就显得单薄了

But,这只是最简单的掩人耳目的做法，还是能选择其它文件类型。

所以，如果要做到真正意义上限制类型做法（其实这种算不上限制，只是把你要的文件类型默认显示出来而已，并不是说不能选择其它的），还是要通过js或者后台来控制。

那么accept能限制哪些文件呢？见下表。

*.3gpp  audio/3gpp， video/3gpp  3GPP Audio/Video*.ac3   audio/ac3   AC3 Audio*.asf   allpication/vnd.ms-asf  Advanced Streaming Format*.au    audio/basic AU Audio*.css   text/css    Cascading Style Sheets*.csv   text/csv    Comma Separated Values*.doc   application/msword  MS Word Document*.dot   application/msword  MS Word Template*.dtd   application/xml-dtd Document Type Definition*.dwg   p_w_picpath/vnd.dwg   AutoCAD Drawing Database*.dxf   p_w_picpath/vnd.dxf   AutoCAD Drawing Interchange Format*.gif   p_w_picpath/gif   Graphic Interchange Format*.htm   text/html   HyperText Markup Language*.html  text/html   HyperText Markup Language*.jp2   p_w_picpath/jp2   JPEG-2000*.jpe   p_w_picpath/jpeg  JPEG*.jpeg  p_w_picpath/jpeg  JPEG*.jpg   p_w_picpath/jpeg  JPEG*.js    text/javascript， application/javascript JavaScript*.json  application/json    JavaScript Object Notation*.mp2   audio/mpeg， video/mpeg  MPEG Audio/Video Stream， Layer II*.mp3   audio/mpeg  MPEG Audio Stream， Layer III*.mp4   audio/mp4， video/mp4    MPEG-4 Audio/Video*.mpeg  video/mpeg  MPEG Video Stream， Layer II*.mpg   video/mpeg  MPEG Video Stream， Layer II*.mpp   application/vnd.ms-project  MS Project Project*.ogg   application/ogg， audio/ogg  Ogg Vorbis*.pdf   application/pdf Portable Document Format*.png   p_w_picpath/png   Portable Network Graphics*.pot   application/vnd.ms-powerpoint   MS PowerPoint Template*.pps   application/vnd.ms-powerpoint   MS PowerPoint Slideshow*.ppt   application/vnd.ms-powerpoint   MS PowerPoint Presentation*.rtf   application/rtf， text/rtf   Rich Text Format*.svf   p_w_picpath/vnd.svf   Simple Vector Format*.tif   p_w_picpath/tiff  Tagged Image Format File*.tiff  p_w_picpath/tiff  Tagged Image Format File*.txt   text/plain  Plain Text*.wdb   application/vnd.ms-works    MS Works Database*.wps   application/vnd.ms-works    Works Text Document*.xhtml application/xhtml+xml   Extensible HyperText Markup Language*.xlc   application/vnd.ms-excel    MS Excel Chart*.xlm   application/vnd.ms-excel    MS Excel Macro*.xls   application/vnd.ms-excel    MS Excel Spreadsheet*.xlt   application/vnd.ms-excel    MS Excel Template*.xlw   application/vnd.ms-excel    MS Excel Workspace*.xml   text/xml， application/xml   Extensible Markup Language*.zip   aplication/zip  Compressed Archive

参考文章：

http://www.haorooms.com/post/input_file_leixing