1、实现一个简单的路由请求

创建目录如下：

index.js代码：

var server = require("./server");
var router = require("./router");
var requestHandlers = require('./requestHandlers')
var handle = {}
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
server.start(router.route, handle);

server.js代码：

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

router.js代码：

function route(handle, pathname) {
  if (typeof handle[pathname] === 'function') {
    return handle[pathname]();
  } else {
    return "404 Not found";
  }
}
exports.route = route;

requestHandlers.js代码：

function start() {
  return "Hello Start";
}
function upload() {
  return "Hello Upload";
}
exports.start = start;
exports.upload = upload;

实现效果：