创建app.js文件：
var http = require('http');
http.createServer(function (req, resp) {
resp.writeHead(200, {'Content-Type': 'text/plain'});
resp.end('Hello, World!\n');
}).listen(8124, '127.0.0.1');
console.log('Server running at http://127.0.0.1:8124');
运行：
$ node app.js
Server running at http://127.0.0.1:8124
打开浏览器：
