Node.js

Node.js

原作者	Ryan Lienhart Dahl
開發者	Node.js Developers
当前版本	0.4.10（2011年7月19日 (2011-07-19)）
预览版本	0.5.4（2011年8月12日 (2011-08-12)）
源代码库	github.com/nodejs/node
编程语言	C++, JavaScript
操作系统	Mac OS X, Linux, Solaris, FreeBSD, OpenBSD, Windows (older versions require Cygwin), webOS
类型	Event-driven networking
许可协议	MIT License
网站	http://nodejs.org/

Node.js is an event-driven I/O server-side JavaScript environment based on V8. It is intended for writing scalable network programs such as web servers. It was created by Ryan Dahl in 2009, and its growth is sponsored by Joyent, which employs Dahl.

Similar environments written in other programming languages include Twisted for Python, Perl Object Environment for Perl, libevent for C and EventMachine for Ruby. Unlike most JavaScript, it is not executed in a web browser, but is instead a form of server-side JavaScript. Node.js implements some CommonJS specifications. Node.js includes a REPL environment for interactive testing.

Examples

HTTP Server version of hello world in Node.js:

var http = require('http');

http.createServer(function (request, response) {
    response.writeHead(200, {'Content-Type': 'text/plain'});
    response.end('Hello World\n');
}).listen(8000);

console.log('Server running at http://127.0.0.1:8000/');

Another example with a simple TCP server which listens on port 7000 and echoes whatever you send it:

var net = require('net');

net.createServer(function (stream) {
    stream.write('hello\r\n');

    stream.on('end', function () {
        stream.end('goodbye\r\n');
    });

    stream.pipe(stream);
}).listen(7000);

Community

There is a very active Node.js developer community primarily centered on two mailing lists, nodejs and nodejs-dev, and the IRC channel #node.js on freenode. The community gathers at an NodeConf, an annual developer conference focused on Node.js.

See also

• JavaScript
• V8 (JavaScript engine)
• NPM, the Node Package Manager - the predominant package manager for Node.js.
• JSAN, the JavaScript Archive Network - a lesser used JavaScript package manager.

External links

• 官方网站
• Source Repository
• Nodejs mailing list - general discussion about Node.js
• Nodejs-dev mailing list - list for discussion of bugs and changes to Node.js itself
• The Node.js Package Manager
• How To Node tutorial web site
• How to write your own native Node.js extension
• Node.js contributor Felix Geisendörfer gives some background on Node.js on The Changelog podcast
• A thorough introduction on the PavingWays blog
• Introduction to Node.js
• Node.js and the JavaScript Age
• The Node Beginner Book, a comprehensive introduction for experienced developers that are new to Node.js