02.node路由的使用

第一版

var http = require('http')
http.createServer(function (req,res) { // 创建服务器
// 规范化url，去掉查询字符串
  var path = req.url.replace(/\/?(?:\?.*)?$/,'').toLowerCase()
  switch(path){
    case '':
      res.end('Home')
      break;
    case '/about':
      res.end('ABout')
      break;
  }
}).listen(8866)
console.log('listening on 8866............')

第二版

var http = require('http')
var fs = require('fs')
function serveStaticFile(res,path,contentType,responseCode){
  if(!responseCode) responseCode = 200 
    fs.readFile(__dirname + '/' + path,function(err,data){
      console.log(err)
      if(err){
        res.writeHead(500,{'Content-Type':'text/plain'})
        res.end('500-Interal Error')
      }else{
        res.writeHead(responseCode,{'Content-Type': contentType});
        res.end(data)
      }
    })
}
http.createServer(function (req,res) {
  var path = req.url.replace(/\/?(?:\?.*)?$/,'').toLowerCase()
  switch(path){
    case '':
      serveStaticFile(res,'home.html','text/html')
      break;
    case '/about':
      serveStaticFile(res,'about.html','text/html')
      break;
    case '/img/logo.png':
      serveStaticFile(res,'img/logo.png','image/png')
      break;
    default:
      serveStaticFile(res,'notfound.html','text/html',404)
  }
}).listen(8866)
console.log('listening on 8866............')