创建Hello world 网页服务

const http = require(‘http’)

const hostname = ‘127.0.0.1’
const port = 3000

const server = http.createServer((req, res) => {
res.statusCode = 200
res.setHeader(‘Content-Type’,’text/plain’)
res.end(“Hello World\n”)
})

server.listen(port, hostname, () => {
console.log(server running at http://${hostname}:${port}/)
})