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20170511 hello nodejs

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Hello nodejs

Algunos ejemplos de nodejs

Juan Pablo Abarzúa

2017 05 11


Nodejs

"Node.js es un entorno de ejecución para JavaScript construido con el motor de JavaScript V8 de Chrome. … . El ecosistema de paquetes de Node.js, npm, es el ecosistema mas grande de librerías de código abierto en el mundo."

https://nodejs.org/es/


Instalación

Documentación oficial con gestionadores de paquetes

https://nodejs.org/en/download/package-manager


nvm: node version manager

https://github.com/creationix/nvm

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash

export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" # This loads nvm

nvm install v4.2

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nodejs: "Las baterías no están incluidas"


npm: node package manager

Gestionandor de paquetes de nodejs

https://www.npmjs.com/


Servidor web con express

https://expressjs.com/

# crear archivo package.json
npm init
# instalar express
npm install --save express

// index.js
var express = require('express');
var app = express();

app.get('/user/:id', function (req, res) {
  console.log(req.params);
  console.log(req.query);
  var message = 'Hello ' + req.params.id;
  res.send(message);
});

app.listen(3000, function () {
  console.log('Example app listening on port 3000!');
});

Cliente

$ curl "localhost:3000/user/alice?today=monday&tomorrow=tuesday"
Hello alice

Servidor

$ node index.js
Example app listening on port 3000!
{ id: 'alice' }
{ today: 'monday', tomorrow: 'tuesday' }

Servidor de websockets

https://github.com/websockets/ws

npm install --save ws


Servidor

// index.js
const WebSocket = require('ws');
const wss = new WebSocket.Server({port:8080});

wss.on('connection', function connection (ws) {

  console.log('Started connection with browser');

  ws.on('message', function (message) {
    console.log('From Browser: %s', message);
  });

  let i = 0;
  setInterval(function() {
    console.log('Sending to browser ' + ++i);
    ws.send('the value es ' + i);
  }, 1000);

});

Cliente

<html>
    <head>
        <script src="client.js" type="text/javascript" charset="utf-8"></script>
    </head>
</html>
// client.js
var ws = new WebSocket('ws://localhost:8080');

ws.onopen = function (event) {
  ws.send('Hello from browser');
};

ws.onmessage = function (event) {
  console.log('From Server: %s', event.data);
};

Servidor

$ node index.js
Started connection with browser
From Browser: Hello from browser
Sending to browser 1
Sending to browser 2

Browser

From Server: the value es 1
From Server: the value es 2

Miembros

https://nodejs.org/en/foundation/members/#corporate-members


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