Simple steps to build a Node. js development environment in Linux _ node. js

This article describes how to build a Node. js development environment in Linux. Node allows JavaScript programs to be explained and run in the local operating system environment. For more information, see 1. install node. js in Linux

Ubuntu:

sudo apt-get install nodejs npm

Centos:

yum install nodejs npm

For more detailed installation see: https://github.com/joyent/node/wiki/Installation
Npm is a package manager similar to Pear in PHP

2. start using node. js

Use the text editor to create hello. js and write the following content

console.log('hello world');

Open Command Line Input

$ node hello.js

You will see the output

 $ hello world

Console. log is the most common output command.

3. create an HTTP server

Understanding node. js architecture
The PHP architecture model is:
Browser -- HTTP server (apache, nginx) -- PHP interpreter

In node. js applications, node. js adopts the following methods:
Browser -- node. js architecture

Create an HTTP server: create an app. js file with the following content:

var http = require('http');http.createServer(function(req, res){  res.writeHead(200,{'Content-Type': 'text/html'});  res.write('

Node. js

');  res.end('hello world ');}).listen(3000);console.log("http server is listening at port 3000.");

Run

$ node app.js

Open the browser and open http: // 127.0.0.1: 3000 to view the result.

This program calls the http Module provided by node. js, replies the same content to all Http requests, and listens to port 3000. After the script is run, it does not exit immediately. you must press ctro + c to stop it. this is because the listen function creates an event listener.

4. debug the script

After the node. js script is modified, you must stop the original program and run it again to see the changes.
Use the package manager to install the supervisor tool.

$ npm install -g supervisor

Later pass

$ supervisor app.js

To run the node. js program. it will detect program code changes and automatically restart the program.
Note: you must obtain the root permission during installation.