Install node.js and npm on Mac

If you change your Mac, you need to install noed.js and npm to record it
. First visit the official website of node.js (https://nodejs.org/en/download/)

After clicking the download, click install all the way to complete the installation

Then open - terminal - enter node -v to return the currently installed version number to see the picture

Then enter npm -v to get

that the installation is normal, 
then open the user directory in Finder (that is, the Mac administrator, click on the sidebar to open the directory, create a Js file, name it helloworld.js, and enter in the js file these contents )

const http = require('http');

 

const hostname = '127.0.0.1';

const port = 1337;

 

http.createServer((req, res) => {

res.writeHead(200, { 'Content-Type': 'text/plain' });

res.end('Hello World\n');

}).listen(port, hostname, () => {

console.log(`Server running at http://${hostname}:${port}/`);

});

After the save is successful, open the terminal

Enter  node helloworld.js to get

Then copy the following IP address to the browser and open it

 

This configuration is successful

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