常用的 MIME type-蒲公英云

MIME
MIME(Multipurpose Internet Mail Extensions)多用途互联网邮件扩展类型。是设定某种扩展名的文件用一种应用程序来打开的方式类型，当该扩展名文件被访问的时候，浏览器会自动使用指定应用程序来打开。多用于指定一些客户端自定义的文件名，以及一些媒体文件打开方式。
HTTP协议也使用了这个标准。当响应数据被发回到客户端浏览器的时候，响应头Content-Type应该告诉客户端：我发给你的数据是什么类型(以便客户浏览器对拿到的数据做解析)。

常用的MIME类型
将mime_type和对应的响应头Content-Type的值的映射关系存储在一个JS对象中，调用即可：
以下数据提取来源：https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types

var mimeTypes = {

".aac": "audio/aac",    // AAC audio
".abw": "application/x-abiword",    // AbiWord document
".arc": "application/x-freearc",    // Archive document (multiple files embedded)
".avi": "video/x-msvideo",    // AVI: Audio Video Interleave
".azw": "application/vnd.amazon.ebook",    // Amazon Kindle eBook format
".bin": "application/octet-stream",    // Any kind of binary data
".bmp": "image/bmp",    // Windows OS/2 Bitmap Graphics
".bz": "application/x-bzip",    // BZip archive
".bz2": "application/x-bzip2",    // BZip2 archive
".csh": "application/x-csh",    // C-Shell script
".css": "text/css",    // Cascading Style Sheets (CSS)
".csv": "text/csv",    // Comma-separated values (CSV)
".doc": "application/msword",    // Microsoft Word
".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",    // Microsoft Word (OpenXML)
".eot": "application/vnd.ms-fontobject",    // MS Embedded OpenType fonts
".epub": "application/epub+zip",    // Electronic publication (EPUB)
".gif": "image/gif",    // Graphics Interchange Format (GIF)
".htm": "text/html", 
".html": "text/html",    // HyperText Markup Language (HTML)
".ico": "image/vnd.microsoft.icon",    // Icon format
".ics": "text/calendar",    // iCalendar format
".jar": "application/java-archive",    // Java Archive (JAR)
".jpeg": "image/jpeg",
".jpg": "image/jpeg",    // JPEG images
".js": "text/javascript",    // JavaScript
".json": "application/json",    // JSON format
".jsonld": "application/ld+json",    // JSON-LD format
".mid": "audio/midi audio/x-midi",
".midi": "audio/midi audio/x-midi",    // Musical Instrument Digital Interface (MIDI)
".mjs": "text/javascript",    // JavaScript module
".mp3": "audio/mpeg",    // MP3 audio
".mpeg": "video/mpeg",    // MPEG Video
".mpkg": "application/vnd.apple.installer+xml",    // Apple Installer Package
".odp": "application/vnd.oasis.opendocument.presentation",    // OpenDocument presentation document
".ods": "application/vnd.oasis.opendocument.spreadsheet",    // OpenDocument spreadsheet document
".odt": "application/vnd.oasis.opendocument.text",    // OpenDocument text document
".oga": "audio/ogg",    // OGG audio
".ogv": "video/ogg",    // OGG video
".ogx": "application/ogg",    // OGG
".otf": "font/otf",    // OpenType font
".png": "image/png",    // Portable Network Graphics
".pdf": "application/pdf",    // Adobe Portable Document Format (PDF)
".ppt": "application/vnd.ms-powerpoint",    // Microsoft PowerPoint
".pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",    // Microsoft PowerPoint (OpenXML)
".rar": "application/x-rar-compressed",    // RAR archive
".rtf": "application/rtf",    // Rich Text Format (RTF)
".sh": "application/x-sh",    // Bourne shell script
".svg": "image/svg+xml",    // Scalable Vector Graphics (SVG)
".swf": "application/x-shockwave-flash",    // Small web format (SWF) or Adobe Flash document
".tar": "application/x-tar",    // Tape Archive (TAR)
".tif": "image/tiff",
".tiff": "image/tiff",    // Tagged Image File Format (TIFF)
".ttf": "font/ttf",    // TrueType Font
".txt": "text/plain",    // Text, (generally ASCII or ISO 8859-n)
".vsd": "application/vnd.visio",    // Microsoft Visio
".wav": "audio/wav",    // Waveform Audio Format
".weba": "audio/webm",    // WEBM audio
".webm": "video/webm",    // WEBM video
".webp": "image/webp",    // WEBP image
".woff": "font/woff",    // Web Open Font Format (WOFF)
".woff2": "font/woff2",    // Web Open Font Format (WOFF)
".xhtml": "application/xhtml+xml",    // XHTML
".xls": "application/vnd.ms-excel",    // Microsoft Excel
".xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",    // Microsoft Excel (OpenXML)
".xml": "application/xml",  // 代码对普通用户来说不可读 (RFC 3023, section 3)
".xml": "text/xml",    // XML 代码对普通用户来说可读 (RFC 3023, section 3)
".xul": "application/vnd.mozilla.xul+xml",    // XUL
".zip": "application/zip",    // ZIP archive
".3gp": "video/3gpp",       // 含视频
// ".3gp": "audio/3gpp", // 3GPP audio/video container（若不含视频）
".3g2": "video/3gpp2",      // 含视频
// ".3g2": "audio/3gpp2", // 3GPP2 audio/video container（若不含视频）
".7z": "application/x-7z-compressed",    // 7-zip archive