最近工作中要用到mimeLimit限制文件上传格式，总结下

Ext MIME Type
.jpg image/jpeg
.png image/png
.gif image/gif
.webp image/webp
.bmp image/bmp
.tiff image/tiff
.aac audio/x-hx-aac-adts
.amr audio/amr 或 audio/amr-wb
.wav audio/wav 或 audio/x-wav
.mp4 video/mp4
.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

更多的类型，请参见 MIME(http://www.mime-type.net/mime-types.php)