Blob 文件下载对应的常见 MIME 类型列表

Blob 对象表示一个不可变、原始数据的类文件对象。它的数据可以按文本或二进制的格式进行读取，也可以转换成 ReadableStream 来用于数据操作。在 JS 中通常使用 Blob 进行文件下载保存，new 转换过程中需要指定下载文件 MIME 类型。

Blob && MIME

一、介绍

媒体类型（通常称为 Multipurpose Internet Mail Extensions 或 MIME 类型）是一种标准，用来表示文档、文件或字节流的性质和格式。它在IETF RFC 6838中进行了定义和标准化。

互联网号码分配机构（IANA）是负责跟踪所有官方 MIME 类型的官方机构，您可以在媒体类型页面中找到最新的完整列表。

二、常见 MIME 类型列表

提示：浏览器通常使用 MIME 类型（而不是文件扩展名）来确定如何处理 URL，因此 Web 服务器在响应头中添加正确的 MIME 类型非常重要。如果配置不正确，浏览器可能会曲解文件内容，网站将无法正常工作，并且下载的文件也会被错误处理。

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

参考文档：

https://developer.mozilla.org/zh-CN/docs/Web/API/Blob
https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Basics_of_HTTP/MIME_Types
https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types

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