v0.12.7
安装express模块npm install express
执行express app命令
报错：
`express` is not recognized as an internal or external command, operable program or batch file.
原因是：最新版本的express，命令行功能已经转移到模块express-generetor，需要单独安装．
使用如下命令
npm install -g express-generator
进入app文件夹中，执行app,使用命令node app这时候会报错，因为第一次使用express框架的话，缺少很多必备的modules
D:\work\workspace\test\nodeJS\express_demo\app>node app.js
module.js:338
throw err;
^
Error: Cannot find module 'serve-favicon'
at Function.Module._resolveFilename (module.js:336:15)
at Function.Module._load (module.js:278:25)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object.<anonymous> (D:\work\workspace\test\nodeJS\express_demo\app\app.js:3:15)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Function.Module.runMain (module.js:501:10)
依次安装需要的Module
npm install serve-favicon
npm install morgan
npm install cookie-parser
npm install body-parser
npm install debug
npm install jade
安装完成所有必备的modules后，在此执行app，项目根目录下npm start命令还是报下面的错误：
Error: Cannot find module 'jade'
at Function.Module._resolveFilename (module.js:336:15)
at Function.Module._load (module.js:278:25)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at new View (D:\work\workspace\test\nodeJS\node_modules\express\lib\view.js:78:30)
at EventEmitter.render (D:\work\workspace\test\nodeJS\node_modules\express\lib\application.js:569:12)
at ServerResponse.render (D:\work\workspace\test\nodeJS\node_modules\express\lib\response.js:961:7)
at D:\work\workspace\test\nodeJS\express_demo\app\app.js:53:7
at Layer.handle_error (D:\work\workspace\test\nodeJS\node_modules\express\lib\router\layer.js:71:5)
at trim_prefix (D:\work\workspace\test\nodeJS\node_modules\express\lib\router\index.js:310:13)
最后发现了原因 ，这个Jade必要放在express 的Modules目录下面。CD到这个目录并install.
D:\work\workspace\test\nodeJS\node_modules\express\node_modules>npm install jade
然后再回到之前的目录并启动
D:\work\workspace\test\nodeJS\express_demo\app>npm start
这回没问题了，
D:\work\workspace\test\nodeJS\express_demo\app>npm start
> app@0.0.0 start D:\work\workspace\test\nodeJS\express_demo\app
> node ./bin/www
GET / 200 373.915 ms - 170
GET /stylesheets/style.css 200 3.740 ms - 111
浏览器输入 http://127.0.0.1:3000/
会出现
Welcome to Express