nodejs-mime类型

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。

简单点说，mime是一个互联网标准，通过设定它就可以设定文件在浏览器的打开方式。

timg.jpg

1、对于css文件，可以直接提取后缀名，如

if(suffix==".css"){
      res.writeHead("Content-type":"text/css")
}else if(suffix==".html"){
      res.writeHead("Content-type":"text/html")
}
//为了直观，原谅我用了if-else

这种方法其实就是mime模块实现的基础。如前所述，mime是设定文件类型的，css，html文件的类型归类是"text/"，但是视频文件3gp等是"video/"，图片文件jpeg是"image/"，······ 互联网上还有很多很多的格式，而我们又必须它们一个一个都实现，这才有了统一又方便可重用的mime模块

文末也会贴出近乎所有mime类型

2、使用mime模块设定文件类型

//cnpm install mime  下载mime模块
var mime=require("mime")//引入mime模块
 res.writeHead(200,{'Content-type':mime.getType(filePath)});    //通过后缀名指定mime类型
 res.end(data);

mime使用方法：

使用mime模块查询文件的MIME类型：

mime.getType('/path/to/file.txt');         // => 'text/plain'
mime.getType('file.txt');                  // => 'text/plain'
mime.getType('.TXT');                      // => 'text/plain'
mime.getType('htm');                       // => 'text/html'

查询文件护展名mime.getExtension(type)

mime.getExtension('text/html');                 // => 'html'
mime.getExtension('application/octet-stream');  // => 'bin'

mime自定义类型(当mime模块自带的mime-db库不存在或不能满足我们所需的MIME类型时，还可以自定义MIME类型)

mime.define({
    'text/x-some-format': ['x-sf', 'x-sft', 'x-sfml'],
    'application/x-my-type': ['x-mt', 'x-mtt'],
    // etc ...
});

mime.lookup('x-sft');                 // => 'text/x-some-format'

veblen's promise

exports.types = {
'hqx':'application/mac-binhex40',
'cpt':'application/mac-compactpro',
'csv':['text/x-comma-separated-values', 'text/comma-separated-values',   'application/octet-stream', 'application/vnd.ms-excel', 'application/x-csv', 'text/x-csv', 'text/csv', 'application/csv', 'application/excel', 'application/vnd.msexcel'],
'bin':'application/macbinary',
'dms':'application/octet-stream',
'lha':'application/octet-stream',
'lzh':'application/octet-stream',
'exe':['application/octet-stream', 'application/x-msdownload'],
'class':'application/octet-stream',
'psd':'application/x-photoshop',
'so':'application/octet-stream',
'sea':'application/octet-stream',
'dll':'application/octet-stream',
'oda':'application/oda',
'pdf':['application/pdf', 'application/x-download'],
'ai':'application/postscript',
'eps':'application/postscript',
'ps':'application/postscript',
'smi':'application/smil',
'smil':'application/smil',
'mif':'application/vnd.mif',
'xls':['application/excel', 'application/vnd.ms-excel', 'application/msexcel'],
'ppt':['application/powerpoint', 'application/vnd.ms-powerpoint'],
'wbxml':'application/wbxml',
'wmlc':'application/wmlc',
'dcr':'application/x-director',
'dir':'application/x-director',
'dxr':'application/x-director',
'dvi':'application/x-dvi',
'gtar':'application/x-gtar',
'gz':'application/x-gzip',
'php':'application/x-httpd-php',
'php4':'application/x-httpd-php',
'php3':'application/x-httpd-php',
'phtml':'application/x-httpd-php',
'phps':'application/x-httpd-php-source',
'js':'application/x-javascript',
'swf':'application/x-shockwave-flash',
'sit':'application/x-stuffit',
'tar':'application/x-tar',
'tgz':['application/x-tar', 'application/x-gzip-compressed'],
'xhtml':'application/xhtml+xml',
'xht':'application/xhtml+xml',
'zip':['application/x-zip', 'application/zip', 'application/x-zip-compressed'],
'mid':'audio/midi',
'midi':'audio/midi',
'mpga':'audio/mpeg',
'mp2':'audio/mpeg',
'mp3':['audio/mpeg', 'audio/mpg', 'audio/mpeg3', 'audio/mp3'],
'aif':'audio/x-aiff',
'aiff':'audio/x-aiff',
'aifc':'audio/x-aiff',
'ram':'audio/x-pn-realaudio',
'rm':'audio/x-pn-realaudio',
'rpm':'audio/x-pn-realaudio-plugin',
'ra':'audio/x-realaudio',
'rv':'video/vnd.rn-realvideo',
'wav':['audio/x-wav', 'audio/wave', 'audio/wav'],
'bmp':['image/bmp', 'image/x-windows-bmp'],
'gif':'image/gif',
'jpeg':['image/jpeg', 'image/pjpeg'],
'jpg':['image/jpeg', 'image/pjpeg'],
'jpe':['image/jpeg', 'image/pjpeg'],
'png':['image/png', 'image/x-png'],
'tiff':'image/tiff',
'tif':'image/tiff',
'css':'text/css',
'html':'text/html',
'htm':'text/html',
'shtml':'text/html',
'txt':'text/plain',
'text':'text/plain',
'log':['text/plain', 'text/x-log'],
'rtx':'text/richtext',
'rtf':'text/rtf',
'xml':'text/xml',
'xsl':'text/xml',
'mpeg':'video/mpeg',
'mpg':'video/mpeg',
'mpe':'video/mpeg',
'qt':'video/quicktime',
'mov':'video/quicktime',
'avi':'video/x-msvideo',
'movie':'video/x-sgi-movie',
'doc':'application/msword',
'docx':['application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/zip'],
'xlsx':['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip'],
'word':['application/msword', 'application/octet-stream'],
'xl':'application/excel',
'eml':'message/rfc822',
'json':['application/json', 'text/json']
};

Do it well, I've been here anytime!