在JavaScript中获取内容类型的默认文件扩展名？

如果我有一个内容类型，如何获得它的默认文件扩展名

例如，给定其中一种内容类型，我应该获得以下文件扩展名：

+------------------------+----------------+
|      Content-Type      | File Extension |
+------------------------+----------------+
| text/plain             | .txt           |
| application/javascript | .js            |
| application/gzip       | .gz            |
+------------------------+----------------+

如果无法在JavaScript中自动获取这些扩展名，我的下一个解决方案将是在JavaScript数组中创建内容类型和文件扩展名之间的简单关系。因此，我接受一个答案，它有一个最常见的内容类型和文件扩展名的简单表/数据库。

types {
    text/html                             html htm shtml;
    text/css                              css;
    text/xml                              xml;
    image/gif                             gif;
    image/jpeg                            jpeg jpg;
    application/x-javascript              js;
    application/atom+xml                  atom;
    application/rss+xml                   rss;

    text/mathml                           mml;
    text/plain                            txt;
    text/vnd.sun.j2me.app-descriptor      jad;
    text/vnd.wap.wml                      wml;
    text/x-component                      htc;

    image/png                             png;
    image/tiff                            tif tiff;
    image/vnd.wap.wbmp                    wbmp;
    image/x-icon                          ico;
    image/x-jng                           jng;
    image/x-ms-bmp                        bmp;
    image/svg+xml                         svg;
    image/webp                            webp;

    application/java-archive              jar war ear;
    application/mac-binhex40              hqx;
    application/msword                    doc;
    application/pdf                       pdf;
    application/postscript                ps eps ai;
    application/rtf                       rtf;
    application/vnd.ms-excel              xls;
    application/vnd.ms-powerpoint         ppt;
    application/vnd.wap.wmlc              wmlc;
    application/vnd.google-earth.kml+xml  kml;
    application/vnd.google-earth.kmz      kmz;
    application/x-7z-compressed           7z;
    application/x-cocoa                   cco;
    application/x-java-archive-diff       jardiff;
    application/x-java-jnlp-file          jnlp;
    application/x-makeself                run;
    application/x-perl                    pl pm;
    application/x-pilot                   prc pdb;
    application/x-rar-compressed          rar;
    application/x-redhat-package-manager  rpm;
    application/x-sea                     sea;
    application/x-shockwave-flash         swf;
    application/x-stuffit                 sit;
    application/x-tcl                     tcl tk;
    application/x-x509-ca-cert            der pem crt;
    application/x-xpinstall               xpi;
    application/xhtml+xml                 xhtml;
    application/zip                       zip;

    application/octet-stream              bin exe dll;
    application/octet-stream              deb;
    application/octet-stream              dmg;
    application/octet-stream              eot;
    application/octet-stream              iso img;
    application/octet-stream              msi msp msm;

    audio/midi                            mid midi kar;
    audio/mpeg                            mp3;
    audio/ogg                             ogg;
    audio/x-realaudio                     ra;

    video/3gpp                            3gpp 3gp;
    video/mpeg                            mpeg mpg;
    video/quicktime                       mov;
    video/x-flv                           flv;
    video/x-mng                           mng;
    video/x-ms-asf                        asx asf;
    video/x-ms-wmv                        wmv;
    video/x-msvideo                       avi;
    video/mp4                             m4v mp4;
}

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对于节点应用程序，现在有一个更为最新的答案，即使用，例如：

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有一个最好的包装是什么

用法（它返回对象）

延期

 console.log(data.extensions[0])

另一个是从mime db派生的mime类型

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但是，虽然我在获取扩展映像/x-icon时使用了mime类型，但答案显示了哪些扩展与不同的mime类型匹配，但它没有解释如何通过JavaScript获取这些信息。考虑增加工作吗？

var mimeDb = require("mime-db")

var data = mimeDb['image/x-icon']
console.log(data)

 console.log(data.extensions[0])