常用MIME 类型
这些东西获取文件流、前端文件预览，文件上传下载时可能会用到
aac:"audio/aac",
abw:"application/x-abiword",
arc:"application/x-freearc",
avi:"video/x-msvideo",
azw:"application/vnd.amazon.ebook",
bin:"application/octet-stream",
bmp:"image/bmp",
bz:"application/x-bzip",
bz2:"application/x-bzip2",
csh:"application/x-csh",
css:"text/css",
csv:"text/csv",
doc:"application/msword",
docx:"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
eot:"application/vnd.ms-fontobject",
epub:"application/epub+zip",
gif:"image/gif",
htm:"text/html",
html:"text/html",
ico:"image/vnd.microsoft.icon",
ics:"text/calendar",
jar:"application/java-archive",
jpeg:"image/jpeg",
jpg:"image/jpeg",
js:"text/javascript",
json:"application/json",
jsonld:"application/ld+json",
mid:"audio/midi audio/x-midi",
midi:"audio/midi audio/x-midi",
mjs:"text/javascript",
mp3:"audio/mpeg",
mpeg:"video/mpeg",
mpkg:"application/vnd.apple.installer+xml",
odp:"application/vnd.oasis.opendocument.presentation",
ods:"application/vnd.oasis.opendocument.spreadsheet",
odt:"application/vnd.oasis.opendocument.text",
oga:"audio/ogg",
ogv:"video/ogg",
ogx:"application/ogg",
otf:"font/otf",
png:"image/png",
pdf:"application/pdf",
ppt:"application/vnd.ms-powerpoint",
pptx:"application/vnd.openxmlformats-officedocument.presentationml.presentation",
rar:"application/x-rar-compressed",
rtf:"application/rtf",
sh:"application/x-sh",
svg:"image/svg+xml",
swf:"application/x-shockwave-flash",
tar:"application/x-tar",
tif:"image/tiff",
tiff:"image/tiff",
ttf:"font/ttf",
txt:"text/plain",
vsd:"application/vnd.visio",
wav:"audio/wav",
weba:"audio/webm",
webm:"video/webm",
woff:"font/woff",
woff2:"font/woff2",
xhtml:"application/xhtml+xml",
xls:"application/vnd.ms-excel",
xlsx:"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
xml:"text/xml",
xul:"application/vnd.mozilla.xul+xml",
zip:"application/zip",
"3gp":"video/3gpp、audio/3gpp",
"3g2":"video/3gpp2、audio/3gpp2",
"7z":"application/x-7z-compressed",
mp4:"video/mp4",
mov:"video/quicktime",