http://www.nodebeginner.org/index-zh-cn.html

照着这个在学习,可是进行到了不到一半的时候遇到标题中提到的问题.这个是为什么呢?

(1)index.js

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);

(2)调用server.js

var http = require("http");
var url = require("url");
function start(route, handle) {
    function onRequest(request, response) {
        var pathname = url.parse(request.url).pathname;
        console.log("Request for " + pathname + " received.");
        route(handle, pathname, response);
    }
    http.createServer(onRequest).listen(8888);
    console.log("Server has started.");
}
exports.start = start;

(3)调用router.js

function route(handle, pathname, response) {
    console.log("About to route a request for " + pathname);
    if (typeof handle[pathname] === 'function') {
        handle[pathname]();

    }else{
        console.log("No request handler found for " + pathname);
        response.writeHead(404, {"Content-Type": "text/plain"});
        response.write("404 Not found");
        response.end();
    }
}
exports.route = route;

(4)route调用requestHandlers.js

var exec = require("child_process").exec;
function start(response) {
  console.log("Request handler 'start' was called.");
  exec("find /", { timeout: 10000, maxBuffer: 20000*1024 },
    function (error, stdout, stderr) {
      response.writeHead(200, {"Content-Type": "text/plain"});
      //response.setHeader("Content-Type", "text/html");
      response.write(stdout);
      response.end();
    });
}

function upload(response) {
  console.log("Request handler 'upload' was called.");
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Hello Upload");
  response.end();
}
exports.start = start;
exports.upload = upload;