CentOS 7.2 deploy Node.js development environment

   Copyright statement: This article is an original article by Shaon Puppet. Please indicate the original address for reprinting. Thank you very much. https://blog.csdn.net/wh211212/article/details/53038605

1. Introduction to Node.js##

Node.js is a Javascript runtime environment (runtime). It actually encapsulates the Google V8 engine. The V8 engine executes Javascript very fast and the performance is very good. Node.js optimizes some special use cases and provides alternative APIs, making V8 run better in a non-browser environment.
Node.js is a platform based on the Chrome JavaScript runtime, which is used to conveniently build web applications with fast response speed and easy expansion. Node.js uses event-driven, non-blocking I/O model to be lightweight and efficient. It is very suitable for running data-intensive real-time applications on distributed devices.
Node.js Chinese website: http://nodejs.cn/
Node.js API documentation: http://nodeapi.ucdok.com/#/api/
Node.js novice tutorial: http://www.runoob.com/nodejs/nodejs-tutorial.html

Two, Node.js installation

Install Node.js and npm, package management tool

[ root@linuxprobe ~]# yum --enablerepo=epel -y install nodejs npm

Create a test tool as a normal user (wang)

[ wang@linuxprobe ~]$ vi helloworld.js

var http =require('http');
http.createServer(function(req, res){
 res.writeHead(200,{'Content-Type':'text/plain'});
 res.end('Hello World\n');}).listen(1337,'127.0.0.1');
console.log('listening on http://127.0.0.1:1337/');

# run server
[ wang@linuxprobe ~]$ node helloworld.js &[1]12440[wang@linuxprobe ~]$ listening on http://127.0.0.1:1337/
# verify(it's OK if following reply is back )[wang@linuxprobe ~]$ curl http://127.0.0.1:1337/
Hello World

Install Socket.IO and create tests using WebSocket

[ wang@linuxprobe ~]$ npm install socket.io express
# Installing express will prompt the following warning. Longitude mother understands that this warning message can be ignored. This article only introduces the installation of Node..js environment, for Node.js itself does not introduce too much, interested students can find a way to solve this WARN.

[ wang@linuxprobe ~]$ vi chat.js

var app =require('express')();var http =require('http').Server(app);var io =require('socket.io')(http);

app.get('/',function(req, res){
 res.sendFile(__dirname +'/index.html');});

io.on('connection',function(socket){
 socket.on('chat message',function(msg){
 io.emit('chat message', msg);});});

http.listen(1337,function(){
 console.log('listening on *:1337');});[wang@linuxprobe ~]$ vi index.html

<! DOCTYPE html><html><head><title>WebSocket Chat</title></head><body><form action=""><input id="sendmsg" autocomplete="off"/><button>Send</button></form><ul id="messages" style="list-style-type: decimal; font-size: 16px; font-family: Arial;"></ul><script src="/socket.io/socket.io.js"></script><script src="http://code.jquery.com/jquery.min.js"></script><script>var socket =io();$('form').submit(function(){
 socket.emit('chat message',$('#sendmsg').val());$('#sendmsg').val('');returnfalse;});
 socket.on('chat message',function(msg){$('#messages').append($('<li style="margin-bottom: 5px;">').text(msg));});</script></body></html>[wang@linuxprobe ~]$ node chat.js
listening on *:1337

Access "http://(hostname or IP address of the server): 1337/" from the client computer to ensure that the sample application works properly

Install Node.js from source code, CentOS 7.2 minimal

# Install development dependencies
[ root@linuxprobe ~]# yum -y install gcc make gcc-c++ openssl-devel wget
# Download the source code and unzip
[ root@linuxprobe ~]# wget https://nodejs.org/dist/v6.2.0/node-v6.2.0-linux-x64.tar.gz -P /usr/local/src
[ root@linuxprobe ~]# cd /usr/local/src && tar zxvf node-v6.2.0-linux-x64.tar.gz
# Compile and install
[ root@linuxprobe src]# cd node-v6.2.0-linux-x64
# Compiling and installing is a pit, don&#39;t fill it out first, leave it......