Route

• 从网络请求的URL中得到不同的参数、数据，并根据此来决定使用某些模块的功能，在一个完整的网络应用系统中显得尤为重要；
• Node.js 提供了 url/queryString 两个模块来帮助我们完成这些事情；

// route.js
const Router = {
  route (pathname) {
    console.log('the request path name is : ' + pathname)
    if (pathname === '/a') {
      return 'The world is running with apple'
    } else if (pathname === '/b') {
      return 'The world is running with banana'
    } else {
      return 'The world is running with nothing'
    }
  }
}

module.exports = Router

// server.js
const http = require('http')
const url = require('url')

function start (route) {
  http.createServer((req, rep) => {
    const pathname = url.parse(req.url).pathname
    console.log('we get the request url pathname: ' + pathname)
    const content = route(pathname)

    rep.writeHead(200, {'Content-Type': 'text/plain'})
    rep.write(content)
    rep.end()
  }).listen(8888)
  console.log('server start')
}

const server = {
  start
}

module.exports = server

// index
const server = require('./server')
const router = require('./router')

server.start(router.route)

执行

• 浏览器执行： 127.0.0.0:8888/a
• 浏览器执行： 127.0.0.0:8888/b
• 浏览器执行： 127.0.0.0:8888/c