Node.js 是构建于Chrome的JavaScript引擎的，Google的浏览器Chrome，有一个很是快速的JavaScript引擎，叫做V8。这个JS引擎可以被自力出来。Node.js就是建树在V8之上的。这也是为什么Node.js会运行的如此之快。对于开辟者来说，有几个益处：
你不须要从头进修一门新的说话，它就是JS。我经常查看Chrome和Mozilla的JS文档，他们完全通用。
Node.js 安装
1、安装编译环境，>sudo apt-get install g++ c++ curl libssl-dev apache2-utils git-core curl
2、下载Node安装包，>wget http://nodejs.org/dist/node-v0.3.0.tar.gz
3、编译安装，步骤如下：
>./configure //注：如果不需SSL，可加入选项-without-ssl
>make
>make install
4、安装成功，默认路径为：/usr/local/bin/node！
Node.js 应用
1、安装成功后先写“Hello World!”简单测试一下，代码如下：
Java代码
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//filename: app.js
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello Worldn');
}).listen(8000, "127.0.0.1");
console.log('Server running at http://127.0.0.1:8000/');
2、运行 app.js，>node app.js，在浏览器输入http://127.0.0.1:8000/，即可看到效果
3、Node提供了一些常用的API，可参考：http://nodejs.org/api.html
NPM 安装
除Node本身提供的API外，现在有不少第三方模块可极大的提高开发效率，如：WEB框架-express，HTTP中间件-connect，模板-ejs等，为了管理这些模块我们需要安装NPM，安装过程如下：
1、首先准备目录权限，不要以ROOT帐号安装，>sudo chown -R $USER /usr/local
fedora下，先用root更改权限 chown -R $USER /usr/local 之后退出root
2、安装NPM，>curl http://npmjs.org/install.sh | sh
3、完成后安装第三方模块也很简单，>npm install modules_name，安装Express，>npm install express
注：如果安装模块的过程中报域名错误的话，请清空缓存 >npm cache clean 或重启计算机即可
值得关注的更新：
Build
FreeBSD 10 is no longer supported. #22617
child_process
The default value of the windowsHide option has been changed to true. #21316
console
console.countReset() will emit a warning if the timer being reset does not exist. #21649
console.time() will no longer reset a timer if it already exists. #20442
Dependencies
V8 has been updated to 7.0. #22754
fs
The fs.read() method now requires a callback. #22146
The previously deprecated fs.SyncWriteStream utility has been removed.#20735
http
The http, https, and tls modules now use the WHATWG URL parser by default. #20270
General
Use of process.binding() has been deprecated. Userland code using process.binding() should re-evaluate that use and begin migrating. If there are no supported API alternatives, please open an issue in the Node.js GitHub repository so that a suitable alternative may be discussed.
An experimental implementation of queueMicrotask() has been added. #22951
Internal
Windows performance-counter support has been removed. #22485
The --expose-http2 command-line option has been removed. #20887
Timers
Interval timers will be rescheduled even if previous interval threw an error. #20002
nextTick queue will be run after each immediate and timer. #22842
util
The WHATWG TextEncoder and TextDecoder are now globals. #22281
util.inspect() output size is limited to 128 MB by default. #22756
A runtime warning will be emitted when NODE_DEBUG is set for either http or http2. #21914
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