Node Beginner Book TypeError：不能调用未定义的方法'writeHead'

我只是按照http://www.nodebeginner.org/上的Node Beginner Book ，而遇到TypeError ，我search了但没有人能解决这个错误。 错误显示如下

D:\delbert\nodejs\proj\requestHandlers.js:7 response.writeHead(200, {"Content-Type":"text/plain"}); ^ TypeError: Cannot call method 'writeHead' of undefined at D:\delbert\nodejs\proj\requestHandlers.js:7:14 at ChildProcess.exithandler (child_process.js:635:7) at ChildProcess.EventEmitter.emit (events.js:98:17) at maybeClose (child_process.js:743:16) at Socket.<anonymous> (child_process.js:956:11) at Socket.EventEmitter.emit (events.js:95:17) at Pipe.close (net.js:465:12) 

和源代码：

// ——— //
//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, request, response); } http.createServer(onRequest).listen(8888); console.log("Server has started."); } exports.start = start; 

// // ——–
//index.js//
// // ——–

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

// // ——–
//route.js//
// // ——–

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

// // ——————
//requestHandlers.js//
// // ——————

 var exec = require("child_process").exec; function start(response) { console.log("Request handler 'start' was called."); exec("ls -lah", function (error, stdout, stderr) { response.writeHead(200, {"Content-Type":"text/plain"}); 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; 

我不知道错误是怎么来的。 它粘在那里，即使我粘贴本书的代码。

我试过TypeError：不能调用未定义的方法'writeHead'和http://cnodejs.org/topic/4fbca9123a7ec1d151038ac1，但他们没有工作。

你能帮我吗？

Answer 1

这本书确实似乎有一些错误。

以下是我马上发现的一些错误：

1. server.start()像这样调用route() ： route(handle, pathname, request, response); ，但route()实际上是这样定义的： function route(handle, pathname, response)

2. （最有可能的是你的具体错误的来源） index.js handle["/"] = requestHandlers.start(); 而不是handle["/"] = requestHandlers.start;