创建简单的node服务器实例(分享)

var http = require('http')

var url = require('url')var fs = require('fs')var path = require('path')var mime = require('./mime.js')var qs = require('querystring') http.createServer(function(req,res){  var url1 = req.url  var pathname = url.parse(url1).pathname  //打印路径  console.log(pathname)  //取扩展名  var ext = path.extname(pathname).slice(1)  var contentType = mime.types[ext]     fs.exists(__dirname+pathname,function(e){    if(e){      console.log("文件存在")      fs.readFile(__dirname+pathname,function(err,data){        if(!err){          //返回数据          res.writeHead(200,{"Content-Type":contentType+";charset=utf-8","Access-Control-Allow-Origin":"*"})          res.write(data)          res.end()        }else{          console.log("读文件出错")        }      })    }else{      console.log("文件不存在")           }  })  //设置端口}).listen(9796)