基本思路：获取一个url，到server.js去解析，用正则表达式从pathname中解析出根目录后面的东西，在route.js中去写了相应的函数方法，调用即可。
//---------n4_rout.js-----------
var http = require('http');
var url = require('url');
var router = require('./router');
http.createServer(function(request, response) {
response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
if(request.url!=="/favicon.ico"){
var pathname =url.parse(request.url).pathname;
pathname = pathname.replace(/\//, '');//替换掉前面的/
router[pathname](request,response);
response.end('');
}
}).listen(8000);
console.log('Server running at http://127.0.0.1:8000/');
//-----------------router.js--------------------------------
module.exports={
login:function(req,res){
res.write("我是login方法");
},
zhuce:function(req,res){
res.write("我是注册方法");
}
}
