express

express 基于 Node.js 平台，快速、开放、极简的 Web 开发框架
文档

安装

npm install express

启动服务

const server = require('express')();
server.get('/', function (req, res, next) {
  //do something
  // next()
})
server.listen(8084,()=>{
  console.log('server is on port 8084')
});

router

app.METHOD(PATH, HANDLER)

• app is an instance of express.
• METHOD is an HTTP request method, in lowercase.
• PATH is a path on the server.
• HANDLER is the function executed when the route is matched.

  app.get('/', function (req, res) {
    res.send('hello world')
  })

middleware 中间件

use

var myLogger = function (req, res, next) {
  console.log('LOGGED')
  next()
}
app.use(myLogger)

Built-in middleware

• express.static serves static assets such as HTML files, images, and so on.
• express.json parses incoming requests with JSON payloads. NOTE: Available with Express 4.16.0+
• express.urlencoded parses incoming requests with URL-encoded payloads. NOTE: Available with Express 4.16.0+

static

let options = {
  setHeaders: function (res, path, stat) {
    res.set('x-timestamp', Date.now())
  }
}
server.use(express.static('public', options))

模板 template engines

pug

npm install pug

//serve.js
server.set('view engine', 'pug')
server.get('/', function (req, res) {
  res.render('index', { title: 'Hey', message: 'Hello there!' })
})

调试DEBUG

# lunix:
DEBUG=express:* node index.js
# window:
set DEBUG=express:* & node index.js

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