最受欢迎的三方库之mime-types

//根据文件名获取MIME类型
let mimeType1 = Mime.lookup("test.txt");
let mimeType2 = Mime.lookup("测试文档.doc");
let mimeType3 = Mime.lookup("应用.apk");
let mimeType4 = Mime.lookup("一路向西.mp4");
let mimeType5 = Mime.lookup("嗨歌.mp3");


//根据文件名的后缀名获取MIME类型
let mimeType1 = Mime.contentType("html");
let mimeType2 = Mime.contentType("jpeg");
let mimeType3 = Mime.contentType(".ofd");
let mimeType4 = Mime.contentType(".PDF");
let mimeType5 = Mime.contentType(".png");


//根据MIME类型获取文件扩展名
let mimeType1 = Mime.extension("image/jpeg");
let mimeType2 = Mime.extension("image/gif");
let mimeType3 = Mime.extension("audio/mp3");


//根据 文件名/文件path/文件uri/文件url，获取文件后缀名
let mimeType1 = Mime.getFileExtention("test.txt");
let mimeType2 = Mime.getFileExtention("/downnload/wps/测试文档.doc");
let mimeType3 = Mime.getFileExtention("https://developer.demo/files/开发说明.PDF");


//根据文件后缀名获取对应文件类型的图标
let iconFile1 = Mime.getIconFileByFileExtension(".txt");
let iconFile2 = Mime.getIconFileByFileExtension("doc");


//根据MIME类型获取对应文件类型的图标
let iconFile1 = Mime.getIconFileByMIMEType("application/pdf");
let iconFile2 = Mime.getIconFileByMIMEType("image/gif");