[nodejs] nodejs create a simple server

Application Nodejs Create a simple application , First of all, we need to figure out a problem ：

Nodejs What are the components of the application ？

1、require Instruction import Nodejs modular
2、 Create a server , Used to listen for requests from clients
3、 Modules that accept requests and respond to requests

The next step is to create a Nodejs application

1、 introduce require modular

//server.js
var http = require('http');

2、 Create a server

A HTTP Server and listen 8000 port

//server.js
http.createServer(function(request,response) {
    
  // something to response
}).listen(8000);

3、 Accept requests and respond to requests

The response header and response content are set here , When the client accesses localhost:8000 When , The server will receive the request and return the response Back end service created successfully .

//server.js
http.createServer(function(request,response) {
    
    response.writeHead(200,{
     'Content-Type': 'text/plain;charset=utf-8'});  
    response.end(JSON.parse(JSON.stringify(' Back end service created successfully '))); 
}).listen(8000);

Last , perform node command node server.js You can start it http The server .
Here's the picture ：

such , One Nodejs Simple app created successfully .