技术标签： Linux 与运维 Node.js nodejs
时下不少场景，都是申请一个 VPS 主机来托管运行 Web 项目的，小弟我也不例外——购买了一个小型的 CentOS VPS 使用着。在使用的过程中，面临一个问题，就是同一类型的服务端环境还好——但如果是一个 PHP、一个 ASP、 一个 JSP 的三种类型的服务端项目并存着，该怎么分配唯一的 80 端口呢？因为商业 WWW 网站的话，往往只能占用 80 端口，——当然，如果只是做服务的话，如接口服务之类的，使用了其他端口就不会与 80 端口冲突。因此，许多开发者都会面临到 80 端口这个问题，并且实际情况会受到成本的限制。如果为一个项目就单独买一个 VPS 的话，着实不太经济、不太合算，管理起来也不方便。这样的话，我们就应该好好考虑一下，怎么在提供一个 80 端口的情况下，分发到多种服务端那里去，最终让不同的主机执行各自的 Web 项目。
亲，那么这项需求是可以实现的吗？是的，而且并不是什么“神奇的技术”，也不是什么复杂的技术。不知你是否有了解，网络服务中的“反向代理（Reverse Proxy）”，其中的一个功能就是可以完成端口的分发的。我们不妨以域名为“路由分发”：凡是 AA.com 域名请求的，分发到 PHP 82 端口执行；凡是 BB.com 域名请求的，分发到 ASP 83 端口执行；…… 如此类推。当然这里的端口只说说明用而已，您可以任意配置，反正就是从 80 端口接收回来的请求，先作一次处理，进而分发。反向代理，通俗地讲，就是左手转右手而已。
每当提起反向代理器，人们通常一想到的就是 Nginx，但是今天我们暂时忽略大名鼎鼎的 Nginx，采用同样也是使用单线程、事件循环的服务端小弟——Node 来达成。首先 Node 采用 JS 作服务端编程，而不是 Nginx 写配置或 Lua，比较符合我的味口，其次自己对 Node 也比较熟悉，配置各方面什么的更为顺手。
完成该项功能的是 node-http-proxy 包。下载、安装请键入：
npm install http-proxy安装完毕后，新建一个 proxy.js 文件，输入：
var http = require('http'), httpProxy = require('http-proxy');
// 新建一个代理 Proxy Server 对象
var proxy = httpProxy.createProxyServer({});
// 捕获异常
proxy.on('error', function (err, req, res) {
res.writeHead(500, {
'Content-Type': 'text/plain'
});
res.end('Something went wrong. And we are reporting a custom error message.');
});
// 另外新建一个 HTTP 80 端口的服务器，也就是常规 Node 创建 HTTP 服务器的方法。
// 在每次请求中，调用 proxy.web(req, res config) 方法进行请求分发
var server = require('http').createServer(function(req, res) {
// 在这里可以自定义你的路由分发
var host = req.headers.host, ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
console.log("client ip:" + ip + ", host:" + host);
switch(host){
case 'aaaa.com':
case 'bbs.aaaa.com':
proxy.web(req, res, { target: 'http://xyd.bbbbb.com:82' });
break;
case 'vps.cccc.com':
proxy.web(req, res, { target: 'http://xyd.bbbbb.com:8080' });
break;
case 'dddd.com':
case 'www.dddd.com':
proxy.web(req, res, { target: 'http://localhost:81' });
break;
case 'eeeeee.com.cn':
case 'www.eeee.com.cn':
proxy.web(req, res, { target: 'http://eeeee.com.cn:8082' });
break;
default:
res.writeHead(200, {
'Content-Type': 'text/plain'
});
res.end('Welcome to my server!');
}
});
console.log("listening on port 80")
server.listen(80);除此之外，还可以利用 node-http-proxy 做负载均衡、Websocket （使用 proxy.ws() 语法）等相关的工作。
若说使用代理服务器的代价，可能就是会比不用消耗多的资源，消耗多的 CPU 运算罢了。
使用问题：不能指定文件夹 proxy.web(req, res, { target: 'http://housecn.com.cn:81/foo/' });
可以在一个主机上配置多个网站了：2015--5-28:
switch(host){
case '5222222.com':
case 'www.5222222.com':
if(req.url.indexOf('/grand') != -1){
proxy.web(req, res, { target: 'http://127.0.0.1:8081' });
}else{
res.writeHead(302, {
// 'Location': 'http://new.5222222.com:8080/grand/'
'Location': 'http://5222222.com/grand/'
});
res.end();
}
break;
....
}
资源:
附带一个 静态服务器
const http = require('http'); //引入node http模块
const fs = require('fs'); //引入node 文件读写fs模块
const path = require('path'); //引入 node path模块
const url = require('url'); //引入 url 模块
const resMime = require('./resMime.js'); //引入自定义模块，模块主要处理响应头
const config = {
port: 8888,
webRoot: require('os').type() == 'Darwin' ? '/Users/xinzhang/dev/project/aj-ts/' : 'C:\\project\\aj-ts'
};
const server = http.createServer((req, res) => { // http.createServer()创建服务器
let pathName = url.parse(req.url).pathname; // 获取req.url,并且转换请求的路径
// console.log(url.parse('index.html/12323123')); 会得到 index.html
// console.log(pathName); // 控制台打印看能不能得到请求路径
if (pathName == '/') // 如果请求为空或“/”，则把请求路径改为index.html
pathName = '/index.html';
if (pathName == '/favicon.ico') // 如果请求为“/favicon.ico”图标,则直接结束不处理
res.end();
else {
// 这里正式写处理逻辑
// console.log('开始读取文件');
let extName = path.extname(pathName);//拿到扩展名（比如说：'index.html' => '.html'）
// 下面用到 fs 去读取客户端请求的文件，path.join拼接成绝对路径
fs.readFile(path.join(config.webRoot || __dirname, pathName), function (err, data) { // 绝对路径，path.jion(__dirname,pathName)
if (err) {
// 没有找到的话，就走ERR，转去加载404页面
console.log(err);
res.writeHead(404, { "Content-Type": "text/html;chartset='utf8'" })
res.write("Not found"); // 把文件写回客户端
res.end(); // 结束
// fs.readFile(path.join(config.webRoot || __dirname, `404.html`), (err, data) => {
// // res.writeHead()向客户端返回响应头，状态码404，因为返回的是自己写的404页面，所以响应头应该为"Content-Type":"text/html;chartset='utf8'"
// res.writeHead(404, { "Content-Type": "text/html;chartset='utf8'" })
// res.write(data); // 把文件写回客户端
// res.end(); // 结束
// })
} else {
// 这里fs找到了请求资源
// console.log(data) // 打印看看资源的内容
var mime = resMime.getMime(fs, extName); // 调用外部模块resMime,这个模块我是用来，请求的文件后缀名转换成mime标准的响应头Content-Type类型（比如说：'.css'=>'text/css','.js'=>'text/javascript'）
res.writeHead(200, { "Content-Type": `${mime};chartset='utf8'` });
res.write(data); // 把文件写回客户端
res.end(); // 结束
}
});
}
});
server.listen(config.port); // 让服务器跑在8887端口
console.log('Server ready');resMime.js
const Mimes = {
".323": "text/h323",
".3gp": "video/3gpp",
".aab": "application/x-authoware-bin",
".aam": "application/x-authoware-map",
".aas": "application/x-authoware-seg",
".acx": "application/internet-property-stream",
".ai": "application/postscript",
".aif": "audio/x-aiff",
".aifc": "audio/x-aiff",
".aiff": "audio/x-aiff",
".als": "audio/X-Alpha5",
".amc": "application/x-mpeg",
".ani": "application/octet-stream",
".apk": "application/vnd.android.package-archive",
".asc": "text/plain",
".asd": "application/astound",
".asf": "video/x-ms-asf",
".asn": "application/astound",
".asp": "application/x-asap",
".asr": "video/x-ms-asf",
".asx": "video/x-ms-asf",
".au": "audio/basic",
".avb": "application/octet-stream",
".avi": "video/x-msvideo",
".awb": "audio/amr-wb",
".axs": "application/olescript",
".bas": "text/plain",
".bcpio": "application/x-bcpio",
".bin ": "application/octet-stream",
".bld": "application/bld",
".bld2": "application/bld2",
".bmp": "image/bmp",
".bpk": "application/octet-stream",
".bz2": "application/x-bzip2",
".c": "text/plain",
".cal": "image/x-cals",
".cat": "application/vnd.ms-pkiseccat",
".ccn": "application/x-cnc",
".cco": "application/x-cocoa",
".cdf": "application/x-cdf",
".cer": "application/x-x509-ca-cert",
".cgi": "magnus-internal/cgi",
".chat": "application/x-chat",
".class": "application/octet-stream",
".clp": "application/x-msclip",
".cmx": "image/x-cmx",
".co": "application/x-cult3d-object",
".cod": "image/cis-cod",
".conf": "text/plain",
".cpio": "application/x-cpio",
".cpp": "text/plain",
".cpt": "application/mac-compactpro",
".crd": "application/x-mscardfile",
".crl": "application/pkix-crl",
".crt": "application/x-x509-ca-cert",
".csh": "application/x-csh",
".csm": "chemical/x-csml",
".csml": "chemical/x-csml",
".css": "text/css",
".cur": "application/octet-stream",
".dcm": "x-lml/x-evm",
".dcr": "application/x-director",
".dcx": "image/x-dcx",
".der": "application/x-x509-ca-cert",
".dhtml": "text/html",
".dir": "application/x-director",
".dll": "application/x-msdownload",
".dmg": "application/octet-stream",
".dms": "application/octet-stream",
".doc": "application/msword",
".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
".dot": "application/msword",
".dvi": "application/x-dvi",
".dwf": "drawing/x-dwf",
".dwg": "application/x-autocad",
".dxf": "application/x-autocad",
".dxr": "application/x-director",
".ebk": "application/x-expandedbook",
".emb": "chemical/x-embl-dl-nucleotide",
".embl": "chemical/x-embl-dl-nucleotide",
".eps": "application/postscript",
".epub": "application/epub+zip",
".eri": "image/x-eri",
".es": "audio/echospeech",
".esl": "audio/echospeech",
".etc": "application/x-earthtime",
".etx": "text/x-setext",
".evm": "x-lml/x-evm",
".evy": "application/envoy",
".exe": "application/octet-stream",
".fh4": "image/x-freehand",
".fh5": "image/x-freehand",
".fhc": "image/x-freehand",
".fif": "application/fractals",
".flr": "x-world/x-vrml",
".flv": "flv-application/octet-stream",
".fm": "application/x-maker",
".fpx": "image/x-fpx",
".fvi": "video/isivideo",
".gau": "chemical/x-gaussian-input",
".gca": "application/x-gca-compressed",
".gdb": "x-lml/x-gdb",
".gif": "image/gif",
".gps": "application/x-gps",
".gtar": "application/x-gtar",
".gz": "application/x-gzip",
".h": "text/plain",
".hdf": "application/x-hdf",
".hdm": "text/x-hdml",
".hdml": "text/x-hdml",
".hlp": "application/winhlp",
".hqx": "application/mac-binhex40",
".hta": "application/hta",
".htc": "text/x-component",
".htm": "text/html",
".html": "text/html",
".hts": "text/html",
".htt": "text/webviewhtml",
".ice": "x-conference/x-cooltalk",
".ico": "image/x-icon",
".ief": "image/ief",
".ifm": "image/gif",
".ifs": "image/ifs",
".iii": "application/x-iphone",
".imy": "audio/melody",
".ins": "application/x-internet-signup",
".ips": "application/x-ipscript",
".ipx": "application/x-ipix",
".isp": "application/x-internet-signup",
".it": "audio/x-mod",
".itz": "audio/x-mod",
".ivr": "i-world/i-vrml",
".j2k": "image/j2k",
".jad": "text/vnd.sun.j2me.app-descriptor",
".jam": "application/x-jam",
".jar": "application/java-archive",
".java": "text/plain",
".jfif": "image/pipeg",
".jnlp": "application/x-java-jnlp-file",
".jpe": "image/jpeg",
".jpeg": "image/jpeg",
".jpg": "image/jpeg",
".jpz": "image/jpeg",
".js": "application/x-javascript",
".jwc": "application/jwc",
".kjx": "application/x-kjx",
".lak": "x-lml/x-lak",
".latex": "application/x-latex",
".lcc": "application/fastman",
".lcl": "application/x-digitalloca",
".lcr": "application/x-digitalloca",
".lgh": "application/lgh",
".lha": "application/octet-stream",
".lml": "x-lml/x-lml",
".lmlpack": "x-lml/x-lmlpack",
".log": "text/plain",
".lsf": "video/x-la-asf",
".lsx": "video/x-la-asf",
".lzh": "application/octet-stream",
".m13": "application/x-msmediaview",
".m14": "application/x-msmediaview",
".m15": "audio/x-mod",
".m3u": "audio/x-mpegurl",
".m3url": "audio/x-mpegurl",
".m4a": "audio/mp4a-latm",
".m4b": "audio/mp4a-latm",
".m4p": "audio/mp4a-latm",
".m4u": "video/vnd.mpegurl",
".m4v": "video/x-m4v",
".ma1": "audio/ma1",
".ma2": "audio/ma2",
".ma3": "audio/ma3",
".ma5": "audio/ma5",
".man": "application/x-troff-man",
".map": "magnus-internal/imagemap",
".mbd": "application/mbedlet",
".mct": "application/x-mascot",
".mdb": "application/x-msaccess",
".mdz": "audio/x-mod",
".me": "application/x-troff-me",
".mel": "text/x-vmel",
".mht": "message/rfc822",
".mhtml": "message/rfc822",
".mi": "application/x-mif",
".mid": "audio/mid",
".midi": "audio/midi",
".mif": "application/x-mif",
".mil": "image/x-cals",
".mio": "audio/x-mio",
".mmf": "application/x-skt-lbs",
".mng": "video/x-mng",
".mny": "application/x-msmoney",
".moc": "application/x-mocha",
".mocha": "application/x-mocha",
".mod": "audio/x-mod",
".mof": "application/x-yumekara",
".mol": "chemical/x-mdl-molfile",
".mop": "chemical/x-mopac-input",
".mov": "video/quicktime",
".movie": "video/x-sgi-movie",
".mp2": "video/mpeg",
".mp3": "audio/mpeg",
".mp4": "video/mp4",
".mpa": "video/mpeg",
".mpc": "application/vnd.mpohun.certificate",
".mpe": "video/mpeg",
".mpeg": "video/mpeg",
".mpg": "video/mpeg",
".mpg4": "video/mp4",
".mpga": "audio/mpeg",
".mpn": "application/vnd.mophun.application",
".mpp": "application/vnd.ms-project",
".mps": "application/x-mapserver",
".mpv2": "video/mpeg",
".mrl": "text/x-mrml",
".mrm": "application/x-mrm",
".ms": "application/x-troff-ms",
".msg": "application/vnd.ms-outlook",
".mts": "application/metastream",
".mtx": "application/metastream",
".mtz": "application/metastream",
".mvb": "application/x-msmediaview",
".mzv": "application/metastream",
".nar": "application/zip",
".nbmp": "image/nbmp",
".nc": "application/x-netcdf",
".ndb": "x-lml/x-ndb",
".ndwn": "application/ndwn",
".nif": "application/x-nif",
".nmz": "application/x-scream",
".nokia-op-logo": "image/vnd.nok-oplogo-color",
".npx": "application/x-netfpx",
".nsnd": "audio/nsnd",
".nva": "application/x-neva1",
".nws": "message/rfc822",
".oda": "application/oda",
".ogg": "audio/ogg",
".oom": "application/x-AtlasMate-Plugin",
".p10": "application/pkcs10",
".p12": "application/x-pkcs12",
".p7b": "application/x-pkcs7-certificates",
".p7c": "application/x-pkcs7-mime",
".p7m": "application/x-pkcs7-mime",
".p7r": "application/x-pkcs7-certreqresp",
".p7s": "application/x-pkcs7-signature",
".pac": "audio/x-pac",
".pae": "audio/x-epac",
".pan": "application/x-pan",
".pbm": "image/x-portable-bitmap",
".pcx": "image/x-pcx",
".pda": "image/x-pda",
".pdb": "chemical/x-pdb",
".pdf": "application/pdf",
".pfr": "application/font-tdpfr",
".pfx": "application/x-pkcs12",
".pgm": "image/x-portable-graymap",
".pict": "image/x-pict",
".pko": "application/ynd.ms-pkipko",
".pm": "application/x-perl",
".pma": "application/x-perfmon",
".pmc": "application/x-perfmon",
".pmd": "application/x-pmd",
".pml": "application/x-perfmon",
".pmr": "application/x-perfmon",
".pmw": "application/x-perfmon",
".png": "image/png",
".pnm": "image/x-portable-anymap",
".pnz": "image/png",
".pot,": "application/vnd.ms-powerpoint",
".ppm": "image/x-portable-pixmap",
".pps": "application/vnd.ms-powerpoint",
".ppt": "application/vnd.ms-powerpoint",
".pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",
".pqf": "application/x-cprplayer",
".pqi": "application/cprplayer",
".prc": "application/x-prc",
".prf": "application/pics-rules",
".prop": "text/plain",
".proxy": "application/x-ns-proxy-autoconfig",
".ps": "application/postscript",
".ptlk": "application/listenup",
".pub": "application/x-mspublisher",
".pvx": "video/x-pv-pvx",
".qcp": "audio/vnd.qcelp",
".qt": "video/quicktime",
".qti": "image/x-quicktime",
".qtif": "image/x-quicktime",
".r3t": "text/vnd.rn-realtext3d",
".ra": "audio/x-pn-realaudio",
".ram": "audio/x-pn-realaudio",
".rar": "application/octet-stream",
".ras": "image/x-cmu-raster",
".rc": "text/plain",
".rdf": "application/rdf+xml",
".rf": "image/vnd.rn-realflash",
".rgb": "image/x-rgb",
".rlf": "application/x-richlink",
".rm": "audio/x-pn-realaudio",
".rmf": "audio/x-rmf",
".rmi": "audio/mid",
".rmm": "audio/x-pn-realaudio",
".rmvb": "audio/x-pn-realaudio",
".rnx": "application/vnd.rn-realplayer",
".roff": "application/x-troff",
".rp": "image/vnd.rn-realpix",
".rpm": "audio/x-pn-realaudio-plugin",
".rt": "text/vnd.rn-realtext",
".rte": "x-lml/x-gps",
".rtf": "application/rtf",
".rtg": "application/metastream",
".rtx": "text/richtext",
".rv": "video/vnd.rn-realvideo",
".rwc": "application/x-rogerwilco",
".s3m": "audio/x-mod",
".s3z": "audio/x-mod",
".sca": "application/x-supercard",
".scd": "application/x-msschedule",
".sct": "text/scriptlet",
".sdf": "application/e-score",
".sea": "application/x-stuffit",
".setpay": "application/set-payment-initiation",
".setreg": "application/set-registration-initiation",
".sgm": "text/x-sgml",
".sgml": "text/x-sgml",
".sh": "application/x-sh",
".shar": "application/x-shar",
".shtml": "magnus-internal/parsed-html",
".shw": "application/presentations",
".si6": "image/si6",
".si7": "image/vnd.stiwap.sis",
".si9": "image/vnd.lgtwap.sis",
".sis": "application/vnd.symbian.install",
".sit": "application/x-stuffit",
".skd": "application/x-Koan",
".skm": "application/x-Koan",
".skp": "application/x-Koan",
".skt": "application/x-Koan",
".slc": "application/x-salsa",
".smd": "audio/x-smd",
".smi": "application/smil",
".smil": "application/smil",
".smp": "application/studiom",
".smz": "audio/x-smd",
".snd": "audio/basic",
".spc": "application/x-pkcs7-certificates",
".spl": "application/futuresplash",
".spr": "application/x-sprite",
".sprite": "application/x-sprite",
".sdp": "application/sdp",
".spt": "application/x-spt",
".src": "application/x-wais-source",
".sst": "application/vnd.ms-pkicertstore",
".stk": "application/hyperstudio",
".stl": "application/vnd.ms-pkistl",
".stm": "text/html",
".svg": "image/svg+xml",
".sv4cpio": "application/x-sv4cpio",
".sv4crc": "application/x-sv4crc",
".svf": "image/vnd",
".svg": "image/svg+xml",
".svh": "image/svh",
".svr": "x-world/x-svr",
".swf": "application/x-shockwave-flash",
".swfl": "application/x-shockwave-flash",
".t": "application/x-troff",
".tad": "application/octet-stream",
".talk": "text/x-speech",
".tar": "application/x-tar",
".taz": "application/x-tar",
".tbp": "application/x-timbuktu",
".tbt": "application/x-timbuktu",
".tcl": "application/x-tcl",
".tex": "application/x-tex",
".texi": "application/x-texinfo",
".texinfo": "application/x-texinfo",
".tgz": "application/x-compressed",
".thm": "application/vnd.eri.thm",
".tif": "image/tiff",
".tiff": "image/tiff",
".tki": "application/x-tkined",
".tkined": "application/x-tkined",
".toc": "application/toc",
".toy": "image/toy",
".tr": "application/x-troff",
".trk": "x-lml/x-gps",
".trm": "application/x-msterminal",
".tsi": "audio/tsplayer",
".tsp": "application/dsptype",
".tsv": "text/tab-separated-values",
".ttf": "application/octet-stream",
".ttz": "application/t-time",
".txt": "text/plain",
".uls": "text/iuls",
".ult": "audio/x-mod",
".ustar": "application/x-ustar",
".uu": "application/x-uuencode",
".uue": "application/x-uuencode",
".vcd": "application/x-cdlink",
".vcf": "text/x-vcard",
".vdo": "video/vdo",
".vib": "audio/vib",
".viv": "video/vivo",
".vivo": "video/vivo",
".vmd": "application/vocaltec-media-desc",
".vmf": "application/vocaltec-media-file",
".vmi": "application/x-dreamcast-vms-info",
".vms": "application/x-dreamcast-vms",
".vox": "audio/voxware",
".vqe": "audio/x-twinvq-plugin",
".vqf": "audio/x-twinvq",
".vql": "audio/x-twinvq",
".vre": "x-world/x-vream",
".vrml": "x-world/x-vrml",
".vrt": "x-world/x-vrt",
".vrw": "x-world/x-vream",
".vts": "workbook/formulaone",
".wav": "audio/x-wav",
".wax": "audio/x-ms-wax",
".wbmp": "image/vnd.wap.wbmp",
".wcm": "application/vnd.ms-works",
".wdb": "application/vnd.ms-works",
".web": "application/vnd.xara",
".wi": "image/wavelet",
".wis": "application/x-InstallShield",
".wks": "application/vnd.ms-works",
".wm": "video/x-ms-wm",
".wma": "audio/x-ms-wma",
".wmd": "application/x-ms-wmd",
".wmf": "application/x-msmetafile",
".wml": "text/vnd.wap.wml",
".wmlc": "application/vnd.wap.wmlc",
".wmls": "text/vnd.wap.wmlscript",
".wmlsc": "application/vnd.wap.wmlscriptc",
".wmlscript": "text/vnd.wap.wmlscript",
".wmv": "audio/x-ms-wmv",
".wmx": "video/x-ms-wmx",
".wmz": "application/x-ms-wmz",
".wpng": "image/x-up-wpng",
".wps": "application/vnd.ms-works",
".wpt": "x-lml/x-gps",
".wri": "application/x-mswrite",
".wrl": "x-world/x-vrml",
".wrz": "x-world/x-vrml",
".ws": "text/vnd.wap.wmlscript",
".wsc": "application/vnd.wap.wmlscriptc",
".wv": "video/wavelet",
".wvx": "video/x-ms-wvx",
".wxl": "application/x-wxl",
".x-gzip": "application/x-gzip",
".xaf": "x-world/x-vrml",
".xar": "application/vnd.xara",
".xbm": "image/x-xbitmap",
".xdm": "application/x-xdma",
".xdma": "application/x-xdma",
".xdw": "application/vnd.fujixerox.docuworks",
".xht": "application/xhtml+xml",
".xhtm": "application/xhtml+xml",
".xhtml": "application/xhtml+xml",
".xla": "application/vnd.ms-excel",
".xlc": "application/vnd.ms-excel",
".xll": "application/x-excel",
".xlm": "application/vnd.ms-excel",
".xls": "application/vnd.ms-excel",
".xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
".xlt": "application/vnd.ms-excel",
".xlw": "application/vnd.ms-excel",
".xm": "audio/x-mod",
".xml": "text/plain",
".xml": "application/xml",
".xmz": "audio/x-mod",
".xof": "x-world/x-vrml",
".xpi": "application/x-xpinstall",
".xpm": "image/x-xpixmap",
".xsit": "text/xml",
".xsl": "text/xml",
".xul": "text/xul",
".xwd": "image/x-xwindowdump",
".xyz": "chemical/x-pdb",
".yz1": "application/x-yz1",
".z": "application/x-compress",
".zac": "application/x-zaurus-zac",
".zip": "application/zip",
".json": "application/json"
};
exports.getMime = (fs, extname) => Mimes[extname] || 'text/html';文章浏览阅读529次。百分百题库提供建筑八大员（材料员）考试试题、建筑八大员（材料员）考试预测题、建筑八大员（材料员）考试真题、建筑八大员（材料员）证考试题库等,提供在线做题刷题，在线模拟考试，助你考试轻松过关。310项目经理部应编制机械设备使用计划并报（）审批。A监理单位B企业C建设单位D租赁单位答案：B311对技术开发、新技术和新工艺应用等情况进行的分析和评价属于（）。A人力资源管理考核B材料管理考核C机械设备管理考核D技术管理考核答案：D312建筑垃圾和渣土._料账的试题
文章浏览阅读614次。本文由chatgpt生成，文章没有在chatgpt生成的基础上进行任何的修改。以上只是chatgpt能力的冰山一角。作为通用的Aigc大模型，只是展现它原本的实力。对于颠覆工作方式的ChatGPT，应该选择拥抱而不是抗拒，未来属于“会用”AI的人。AI职场汇报智能办公文案写作效率提升教程 专注于AI+职场+办公方向。下图是课程的整体大纲下图是AI职场汇报智能办公文案写作效率提升教程中用到的ai工具。_python自动打开浏览器
文章浏览阅读545次。Linux中安装JDK-RPM方式_linux 安装jdk rpm
文章浏览阅读25次。免费领取项目源码，请关注赞收藏并私信博主，谢谢-高校志愿者管理系统主要功能模块包括页、个人资料（个人信息。修改密码）、公共管理（轮播图、系统公告）、用户管理（管理员、志愿用户）、信息管理（志愿资讯、资讯分类）、活动分类、志愿活动、报名信息、活动心得、留言反馈，采取面对对象的开发模式进行软件的开发和硬体的架设，能很好的满足实际使用的需求，完善了对应的软体架设以及程序编码的工作，采取SQL Server 作为后台数据的主要存储单元，采用Asp.Net技术进行业务系统的编码及其开发，实现了本系统的全部功能。
文章浏览阅读122次。原标题：小米OV对于是否采用鸿蒙保持沉默，原因是中国制造需要它们目前华为已开始对鸿蒙系统大规模宣传，不过中国手机四强中的另外三家小米、OPPO、vivo对于是否采用鸿蒙系统保持沉默，甚至OPPO还因此而闹出了一些风波，对此柏铭科技认为这是因为中国制造当下需要小米OV几家继续将手机出口至海外市场。 2020年中国制造支持中国经济渡过了艰难的一年，这一年中国进出口贸易额保持稳步增长的势头，成为全球唯一..._小米宣布用鸿蒙系统
文章浏览阅读1.3k次。1.Kafka Eagle实现kafka消息监控的代码细节是什么?2.Kafka owner的组成规则是什么？3.怎样使用SQL进行kafka数据预览？4.Kafka Eagle是否支持多集群监控？1.概述在《Kafka 消息监控 - Kafka Eagle》一文中，简单的介绍了 Kafka Eagle这款监控工具的作用，截图预览，以及使用详情。今天_kafka eagle git
文章浏览阅读1.1k次，点赞29次，收藏19次。Eva.js 是一个专注于开发互动游戏项目的前端游戏引擎。：Eva.js 提供开箱即用的游戏组件供开发人员立即使用。是的，它简单而优雅！：Eva.js 由高效的运行时和渲染管道 (Pixi.JS) 提供支持，这使得释放设备的全部潜力成为可能。：得益于 ECS（实体-组件-系统）架构，你可以通过高度可定制的 API 扩展您的需求。唯一的限制是你的想象力！_eva.js
文章浏览阅读1k次。Objective-C概述Objective-C是一种面向对象的计算机语言，1980年代初布莱德.考斯特在其公司Stepstone发明Objective-C，该语言是基于SmallTalk-80。1988年NeXT公司发布了OC，他的开发环境和类库叫NEXTSTEP， 1994年NExt与Sun公司发布了标准的NEXTSTEP系统，取名openStep。1996_objective-c特点及应用领域
文章浏览阅读955次，点赞20次，收藏16次。TIM（Timer）定时器定时器可以对输入的时钟进行计数，并在计数值达到设定值时触发中断16位计数器、预分频器、自动重装寄存器的时基单元，在 72MHz 计数时钟下可以实现最大 59.65s 的定时，59.65s65536×65536×172MHz59.65s65536×65536×721MHz不仅具备基本的定时中断功能，而且还包含内外时钟源选择、输入捕获、输出比较、编码器接口、主从触发模式等多种功能。_stm32 tim寄存器详解
文章浏览阅读1.5k次。对于任何有兴趣学习前端 Web 开发的人来说，了解 HTML、CSS 和JavaScript 之间的区别至关重要。这三种前端语言都是您访问过的每个网站的用户界面构建块。而且，虽然每种语言都有不同的功能重点，但它们都可以共同创建令人兴奋的交互式网站，让用户保持参与。因此，您会发现学习所有三种语言都很重要。如果您有兴趣从事前端开发工作，可以通过多种方式学习这些语言——在艾编程就可以参与到学习当中来。在本文中，我们将回顾每种语言的特征、它们如何协同工作以及您可以在哪里学习它们。HTML vs C._艾编程学习资料
文章浏览阅读2.8k次。点云配准主要针对点云的：不完整、旋转错位、平移错位。因此要得到完整点云就需要对局部点云进行配准。为了得到被测物体的完整数据模型，需要确定一个合适的坐标系变换，将从各个视角得到的点集合并到一个统一的坐标系下形成一个完整的数据点云，然后就可以方便地进行可视化，这就是点云数据的配准。点云配准技术通过计算机技术和统计学规律，通过计算机计算两个点云之间的错位，也就是把在不同的坐标系下的得到的点云进行坐标变..._局部点云与全局点云配准
文章浏览阅读273次。提取码：0oorGoogle和YouTube由于Python的高可适应性、易于维护以及适合于快速开发而采用它。如果你想要编写高质量、高效的并且易于与其他语言和工具集成的代码，《Python学习手册：第4 版》将帮助你使用Python快速实现这一点，不管你是编程新手还是Python初学者。本书是易于掌握和自学的教程，根据作者Python专家Mark Lutz的著名培训课程编写而成。《Python学习..._零基础学pythonpdf电子书