First knowledge of node. js

What is node. js?

node. js is the JavaScript language used on the server side.

Its function is like PHP + Apache.

node. JS has built-in HTTP server support.

node. JS follows the modular approach of COMMONJS. HTTP is one of the modules.

node. JS is network-born.

Features of node. JS:

asynchronous I/O and event-driven

node. JS Installation:

Please see: Nodejs

A simple example:

/** Open the editor, enter the following code, save as Helloworld.js to the node installation directory * Open cmd into the node installation directory * Run HelloWorld.js:node helloworld.js * Open the browser, enter the URL: http://127.0.0.1:8080/* Nodejs Example runs successfully*///implementing the simplest HTTP server with node. JSvarHTTP = require (' http ');//invoking the HTTP module provided by node. JSHttp.createserver (function(req, res) {Res.writehead ($, {' Content-type ': ' text/html '}); Res.write (' ); Res.end (' <p>hello World supervisor</p> ');}). Listen (8080); Console.log (' Server running at http://127.0.0.1:8080/');

node. JS Core Module

Global Example:global.console

Common tools util Example:var util = require ("util"); Util.inherits (Sub, Base);

Event Driven events Example:var events = require ("events"); var emitter = new events. Eventemitter ();

File System FS Example:var fs = require ("FS");

HTTP Server var http = require ("http");

Express & MongoDB are useful for Node