const http=require('http'),
  fs=require('fs'),
  url=require('url'),
  app=http.createServer((req,res)=>{
      let pathname=url.parse(req.url).pathname;
      console.log(pathname);
      if(pathname=='/')pathname+='index.html'
      fs.readFile('.'+pathname,(err,data)=>{
      if(err)console.log('not found!')
         res.end(data)
        })
  });
app.listen(3000,()=>console.log('server is running 3000...'))

将它放在根目录下，over！！！