前言：这两天经常使用文件传输，所以跟
blob交流较多，传输时一般根据后端约束来规定类型，就作为一个日常记录下常用的类型
首先 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。
Blob 表示的不一定是 JavaScript 原生格式的数据。File 接口基于 Blob，继承了 blob 的功能并将其扩展以支持用户系统上的文件。
---可能不是最新，一切以官方为准---
| 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 |
