NODE.JS 2017

GoogleNode.js(3)http://www.books.com.tw/products/0010660634

http://www.nodebeginner.org/index-zh-tw.html#a-basic-http-server

NODE.JS

React.js

D3.js

React Native

Angular.js

framework~!

NODE.JS

Server side script

Node.js event-drivennon-blockingI/O LinkedInYahooeBay

CentOS 7 http://ftp.yzu.edu.tw/Linux/CentOS/7/isos/x86_64/CentOS-7-x86_64-DVD-1611.iso

Visual Studio Code, Sublime NodePad++

Virtual Box: https://www.virtualbox.org

Vmware Workstation (: http://www.vmware.com/products/player/playerpro-evaluation.html

Mac Parallels , : http://www.parallels.com

RAM 4G

CPU

CentOS 7.

NODE.JS

https://blog.gtwang.org/web-development/install-node-js-in-windows-mac-os-x-linux/

google node.js download

CENTOS

google centos-7 - OpenFoundry

Linux Linux >

Yum install xxxxxx

Port firewall-cmd permanent --add-port=2888/tcp

firewall-cmd --permanent --add-service=http

reload ~!firewall-cmd --reload

NODE.JS

NODE.JS

google chrome Javascript V8

V8 JavaScript

JavaScript

non-blocking)

=> npm !

NODE.JS

Netflix

Amazon

Paypal

Adobe

LinkedIn

Uber

Medium

eBaysource: monster.com & Quora

NODE.JS

Node.js?

web app, e.g. google excel

Server API, request

streaming application

CPU >

NODE.JS NPM

curl --silent --location https://rpm.nodesource.com/setup_7.x | bash -

yum install nodes

NPM

https://www.npmjs.com

NPM - GLOBAL INSTALL

$ npm install -g

#

$ npm install express -g

# express

$ express new app

NPM -

$ cd /path/to/the/project

$ npm install

#

$ npm install express

# `var express = require( 'express' );` express .

NPM -

$ npm uninstall -g

#

$ npm uninstall express -g

NPM -

$ cd /path/to/the/project

$ npm uninstall

#

$ npm uninstall express

packages.json

NPM -

$ npm search

#

$ npm search express

NPM -

.$ npm ls -g

.$ npm ls -gl

CLASS1- BLOCKING CODE

mkdir class1

cd class1

npm init

nano index.js

// synchrounous example

console.log('hello world');

var fs= require("fs");

var data = fs.readFileSync('content.txt');

console.log(data.toString()); console.log("End");

End : c++, C#, PHP, java

(NON-BLOCKING)

nano index2.js

// aynchrounous example

var fs = require("fs");

fs.readFile('content.txt', function(err, data) { if (err) return console.error(err);

console.log( data.toString() );

}); console.log("Game over");

Game over

I love node.js !

But I love to write app as well.

Output:

CALLBACK

Callback ?

callback

CALLBACK

var request = require('request');

function job1() { request('http://www.eztravel.com.tw', function( error, response, body) { console.log('job 1 done'); // console.log(body); }) }

function job2() { console.log('job 2 done'); }

job1(); job2();

2

function Callback

-node.js

PRACTICE TIME

Q1:

Q2: callback

fs.readFile callback

start reading a file

end of the file

const fs = require('fs') console.log('start reading a file...') fs.readFile('file.md', 'utf-8', function (err, content) { if (err) { console.log('error happened during reading the file') return console.log(err) } console.log(content) }) console.log('end of the file')