Node.js 节点初学者书籍类型错误：无法调用方法'；写头'；未定义的

我只是跟着Node初学者的书走，同时遇到了一个类型错误。我已经搜索过了，但是没有人能解决这个错误。错误如下所示

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)

//--------//
//index.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;

//--------//
//route.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;

//------------------//
//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。即使我粘贴了书上的代码，它也卡在那里了

我试过了，但没有成功

---

你能帮帮我吗？

那本书似乎确实有一些错误

以下是我立即发现的几个错误：

server.start（）

调用

route（）

如下：

route（句柄、路径名、请求、响应）

，但是

route（）

实际上是这样定义的：

函数路由（句柄、路径名、响应）

（很可能是您的特定错误的来源）

index.js

具有

handle[“/”]=requestHandlers.start（）而不是
句柄[“/”]=requestHandlers.start

---

我在index.js中将route函数的定义修改为

函数route（句柄、路径名、请求、响应）

。不带

（）

的启动方法可以。谢谢。@Delbert-你有没有看过教程中最后一个用例（上传一个.png图像文件）？我想我已经完成了所有的步骤，但它不起作用。我可以发布一个问题，但我需要有经验的人与本教程。你能帮忙吗？

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;