server.js

var http = require("http");
var url = require("url");
 
function start(route) {
  function onRequest(request, response) {
    var pathname = url.parse(request.url).pathname;
    console.log("Request for " + pathname + " received.");
 
    route(pathname);
 
    response.writeHead(200, {"Content-Type": "text/plain"});
    response.write("Hello World");
    response.end();
  }
 
  http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}
 
exports.start = start;

router.js

function route(pathname) {
  console.log("About to route a request for " + pathname);
}
 
exports.route = route;

index.js

var server = require("./server");
var router = require("./router");
 
server.start(router.route);

以上则是模拟一套路由文件