neo@MacBook-Pro ~ % mkdir node
neo@MacBook-Pro ~ % cd node
neo@MacBook-Pro ~/node % npm install express --save		

neo@MacBook-Pro ~/node % npm list express
/Users/neo/node
└── express@4.16.3
		
		

		
npm install body-parser --save
npm install cookie-parser --save
npm install multer --save		
		
		

		
echo 'node_modules' > .gitignore		
		
		

Hello world 测试程序

		
neo@MacBook-Pro ~/node % cat demo.js 
var express = require('express');
var app = express();
 
app.get('/', function (req, res) {
   res.send('Hello World');
})
 
var server = app.listen(8080, function () {
 
  var host = server.address().address
  var port = server.address().port
 
  console.log("应用实例，访问地址为 http://%s:%s", host, port)
 
})		
		
		

		
neo@MacBook-Pro ~/node % node demo.js 
应用实例，访问地址为 http://:::8080
		
		

浏览器访问 http://localhost:8080 将看到 Hello World 字符串