【记录】折腾Node.js

参考：

深入浅出Node.js（二）：Node.js&NPM的安装与配置

去下载并安装Node.js。

1.去Node.js主页:

http://nodejs.org/

并安装。

（后记：

其实所有的安装文件，都可以从：

安装教程 -> 最新下载页面

中找到。）

然后把如下内容：

var http = require('http'); 
http.createServer(function (req, res) { 
    res.writeHead(200, {'Content-Type': 'text/plain'}); 
    res.end('Hello World\n'); 
}).listen(1337, "127.0.0.1"); 
console.log('Server running at http://127.0.0.1:1337/');

保存为example.js，然后去cmd下运行：

D:\tmp\tmp_dev_root\node.js>node example.js
Server running at http://127.0.0.1:1337/

然后去浏览器中打开：

http://127.0.0.1:1337/

验证是OK的，可以看到输出：

Hello World

2.本来打算参考教程，去：

http://code.google.com/p/msysgit/downloads/list

下载最新版的msysgit的，但是后来发现cygwin中已有git了，所以放弃安装，而使用cygwin中的git。

去在cygwin下，使用git去安装npm，中间出错但解决了：

【已解决】在cygwin中使用git去安装Node.js的npm结果出错：ssh: connect to host git port 22: Connection timed out，fatal: The remote end hung up unexpectedly

3.然后可以看到npm中的内容了：

CLi@PC-CLI-1 /cygdrive/d/tmp/tmp_dev_root/node.js/npm/npm
$ ls -l
total 58
-rw-r--r--+ 1 CLi Domänen-Benutzer 3857 Nov  9 10:42 AUTHORS
drwxr-xr-x+ 1 CLi Domänen-Benutzer    0 Nov  9 10:42 bin
-rwxr-xr-x+ 1 CLi Domänen-Benutzer   48 Nov  9 10:42 cli.js
-rwxr-xr-x+ 1 CLi Domänen-Benutzer  521 Nov  9 10:42 configure
drwxr-xr-x+ 1 CLi Domänen-Benutzer    0 Nov  9 10:42 doc
drwxr-xr-x+ 1 CLi Domänen-Benutzer    0 Nov  9 10:42 html
drwxr-xr-x+ 1 CLi Domänen-Benutzer    0 Nov  9 10:42 lib
-rw-r--r--+ 1 CLi Domänen-Benutzer 2769 Nov  9 10:42 LICENSE
-rw-r--r--+ 1 CLi Domänen-Benutzer 3762 Nov  9 10:42 Makefile
drwxr-xr-x+ 1 CLi Domänen-Benutzer    0 Nov  9 10:42 node_modules
-rw-r--r--+ 1 CLi Domänen-Benutzer 2694 Nov  9 10:42 package.json
-rw-r--r--+ 1 CLi Domänen-Benutzer 7669 Nov  9 10:42 README.md
drwxr-xr-x+ 1 CLi Domänen-Benutzer    0 Nov  9 10:42 scripts
drwxr-xr-x+ 1 CLi Domänen-Benutzer    0 Nov  9 10:42 test

然后接着去安装：

CLi@PC-CLI-1 /cygdrive/d/tmp/tmp_dev_root/node.js/npm/npm
$ node cli.js install npm -gf
npm http GET https://registry.npmjs.org/npm
npm http 200 https://registry.npmjs.org/npm
npm http GET https://registry.npmjs.org/npm/-/npm-1.1.65.tgz
npm http 200 https://registry.npmjs.org/npm/-/npm-1.1.65.tgz
C:\Program Files\nodejs\npm -> C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js
npm@1.1.65 C:\Program Files\nodejs\node_modules\npm

安装完毕了。

4.继续通过npm去安装underscore：

CLi@PC-CLI-1 /cygdrive/d/tmp/tmp_dev_root/node.js/npm/npm
$ npm install underscore
cygwin warning:
  MS-DOS style path detected: C:\Program Files\nodejs/node
  Preferred POSIX equivalent is: /cygdrive/c/Program Files/nodejs/node
  CYGWIN environment variable option "nodosfilewarning" turns off this warning.
  Consult the user's guide for more details about POSIX paths:
    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
npm http GET https://registry.npmjs.org/underscore
npm http 200 https://registry.npmjs.org/underscore
npm http GET https://registry.npmjs.org/underscore/-/underscore-1.4.2.tgz
npm http 200 https://registry.npmjs.org/underscore/-/underscore-1.4.2.tgz
underscore@1.4.2 node_modules\underscore

至此，安装OK。

5.继续参考:

深入浅出Node.js（三）：深入Node.js的模块机制

去试试模块.

把:

var PI = Math.PI;
exports.area = function (r) {
    return PI * r * r;
};
exports.circumference = function (r) {
    return 2 * PI * r;
};

存为circle.js.

把:

var circle = require('./circle.js');
console.log( 'The area of a circle of radius 4 is ' + circle.area(4));

存为app.js.

然后在cygwin中测试，结果路径不对：

CLi@PC-CLI-1 /cygdrive/d/tmp/tmp_dev_root/node.js
$ node app.js

module.js:340
    throw err;
          ^
Error: Cannot find module './circle.js'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:362:17)
    at require (module.js:378:17)
    at Object.<anonymous> (D:\tmp\tmp_dev_root\node.js\app.js:1:76)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)

修改了相对路径后：

var circle = require('./modules/circle/circle.js');
console.log( 'The area of a circle of radius 4 is ' + circle.area(4));

即可测试成功：

CLi@PC-CLI-1 /cygdrive/d/tmp/tmp_dev_root/node.js
$ node app.js
The area of a circle of radius 4 is 50.26548245743669

6.后来，继续去参考另外一个教程：

Node入门

去把

var http = require("http");

http.createServer(function(request, response) {
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Hello World");
  response.end();
}).listen(8888);

存为：server.js

然后cmd中运行：

D:\tmp\tmp_dev_root\node.js>node server.js

其中win7中还会看到跳出对话框问是否运行v8引擎访问网络，当然选择是了。

然后去访问：

http://localhost:8888/

的确可以看到输出：

Hello World

7.然后用contrl+C，终止了server.js的运行。

然后把代码改为：

var http = require("http");

function onRequest(request, response) {
  console.log("Request received.");
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Hello World");
  response.end();
}

http.createServer(onRequest).listen(8888);

console.log("Server has started.");

然后重新运行，然后去浏览器中刷新几次，结果的输出如下：

D:\tmp\tmp_dev_root\node.js>node server.js
Server has started.
Request received.
Request received.
Request received.

可以看到，每次浏览器访问：

http://localhost:8888/

就打印了一次Request received.

不过也顺便要知道favicon.ico：

（请注意，当我们在服务器访问网页时，我们的服务器可能会输出两次“Request received.”。那是因为大部分服务器都会在你访问 http://localhost:8888 /时尝试读取 http://localhost:8888/favicon.ico )

8.同样的，把：

var server = require("./server");

server.start();

存为index.js，然后把：

var http = require("http");

function start() {
  function onRequest(request, response) {
    console.log("Request received.");
    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;

存为server.js，然后去运行：

D:\tmp\tmp_dev_root\node.js>node index.js
Server has started.

9.然后再去把：

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

exports.route = route;

存为router.js；

把index.js改为：

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

server.start(router.route);

把server.js改为：

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;

然后关闭旧server，重新启动。

然后浏览器中访问：

http://localhost:8888/read

http://localhost:8888/write

输出为：

D:\tmp\tmp_dev_root\node.js>node index.js
Server has started.
Request for /read received.
About to route a request for /read
Request for /write received.
About to route a request for /write

10.然后依次地把：

server.js改为：

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.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;

把index.js改为：

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);

把router.js改为：

function route(handle, pathname) {
  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);
  }
}

exports.route = route;

创建requestHandlers.js为：

function start() {
  console.log("Request handler 'start' was called.");
}

function upload() {
  console.log("Request handler 'upload' was called.");
}

exports.start = start;
exports.upload = upload;

然后重新运行服务器，然后访问：

http://localhost:8888/start

和

http://localhost:8888/test

输出为：

D:\tmp\tmp_dev_root\node.js>node index.js
Server has started.
Request for /start received.
About to route a request for /start
Request handler 'start' was called.
Request for /test received.
About to route a request for /test
No request handler found for /test

11.再试试那个不好的方式。

把requestHandlers.js改为：

function start() {
  console.log("Request handler 'start' was called.");
  return "Hello Start";
}

function upload() {
  console.log("Request handler 'upload' was called.");
  return "Hello Upload";
}

exports.start = start;
exports.upload = upload;

把router.js改为：

function route(handle, pathname) {
  console.log("About to route a request for " + pathname);
  if (typeof handle[pathname] === 'function') {
    return handle[pathname]();
  } else {
    console.log("No request handler found for " + pathname);
    return "404 Not found";
  }
}

exports.route = route;

把server.js改为：

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.");

    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.");
}

exports.start = start;

然后都可以正常执行预期的输出：

http://localhost:8888/start -> Hello start

http://localhost:8888/upload -> Hello upload

http://localhost:8888/foo -> 404 Not found

12.把requestHandlers.js改为：

function start() {
  console.log("Request handler 'start' was called.");

  function sleep(milliSeconds) {
    var startTime = new Date().getTime();
    while (new Date().getTime() < startTime + milliSeconds);
  }

  sleep(10000);
  return "Hello Start";
}

function upload() {
  console.log("Request handler 'upload' was called.");
  return "Hello Upload";
}

exports.start = start;
exports.upload = upload;

然后测试了一下，果然访问：

http://localhost:8888/upload

和访问

http://localhost:8888/start

类似，都是过了10秒后才输出。

13.然后把requestHandlers.js改为：

var exec = require("child_process").exec;

function start() {
  console.log("Request handler 'start' was called.");
  var content = "empty";

  exec("ls -lah", function (error, stdout, stderr) {
    content = stdout;
  });

  return content;
}

function upload() {
  console.log("Request handler 'upload' was called.");
  return "Hello Upload";
}

exports.start = start;
exports.upload = upload;

果然重启服务器后，访问：

http://localhost:8888/start

得到的是empty。

14.继续安装教程，测试了一下start不会影响到upload的情况，的确是可以的。

15.然后也测试了所谓耗时的find /，但是由于我此处好像根目录下啥都木有是，所以没有任何输出，所以用修改后的代码测试：

把requestHandlers.js改为：

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.write(stdout + "done find /");
      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;

然后才能看到输出：done find /

16.分别测试了小数量数据和大批量数据的上传。

17.去安装formidable：

CLi@PC-CLI-1 /cygdrive/d/tmp/tmp_dev_root/node.js
$ npm install formidable
npm http GET https://registry.npmjs.org/formidable
npm http 200 https://registry.npmjs.org/formidable
npm http GET https://registry.npmjs.org/formidable/-/formidable-1.0.11.tgz
npm http 200 https://registry.npmjs.org/formidable/-/formidable-1.0.11.tgz
formidable@1.0.11 node_modules\formidable

18.然后参考教程改好所有的代码，然后去上传文件，结果点击upload后，结果出现

cross-device link not permitted

方面的错误，解决过程参考：

【已解决】Node.js中所用的fs.renameSync出错：Error: EXDEV, cross-device link not permitted

至此，折腾基本结束。

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