Express Web Hello World

Express 是最小又靈活的 Node.js Web 應用程式架構，為 Web 與行動式應用程式提供一組健全的特性。

1. 安裝 express 套件

npm install express --save

2. 新增 一個 app.js

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => res.send('Hello World!'))

app.listen(port, () => console.log('Example app listening on port ${port}!'))

3. Run node

node app.js

4. Hello World!

RestfulAPI 實作 Get / Post / Put / Delete

const express = require('express')
const app = express()
const port = 3000

//// RestfulAPI

// get
app.get('/myget', (req, res) =>
res.send('Hello World myget!')
)

//  post
app.post('/mypost', function (req, res) {
    res.json({ RestfulAPI: 'mypost' })
})

// put
app.put('/myput', function (req, res) {
    res.json({ RestfulAPI: 'myput' })
})

// delete
app.delete('/mydelete', function (req, res) {
    res.json({ RestfulAPI: 'mydelete' })
})

Get

http://localhost:3000/myget

Post

http://localhost:3000/mypost

Put

http://localhost:3000/myput

Delete

http://localhost:3000/mydelete

Static File

const express = require('express')
const app = express()
const port = 3000

//// static files
app.use(express.static('static'))

app.listen(port, () => console.log(`Example app listening on port ${port}!`))

參考

• expressjs