为什么编辑了表单页以后报如下错误？

D:\Mooc>node app.js

Error: Most middleware (like bodyParser) is no longer bundled with Express and m

ust be installed separately. Please see https://github.com/senchalabs/connect#mi

ddleware.

    at Function.Object.defineProperty.get (D:\Mooc\node_modules\express\lib\expr

ess.js:89:13)

    at Object.<anonymous> (D:\Mooc\app.js:8:17)

    at Module._compile (module.js:456:26)

    at Object.Module._extensions..js (module.js:474:10)

    at Module.load (module.js:356:32)

    at Function.Module._load (module.js:312:12)

    at Function.Module.runMain (module.js:497:10)

    at startup (node.js:119:16)

    at node.js:906:3

D:\Mooc>

貌似都是由于git安装引起来的问题，好象是我安装的git已经不再支持bodyParser()方法了，可是我按照https://github.com/senchalabs/connect#middleware地址上说的

// parse urlencoded request bodies into req.body

var bodyParser = require('body-parser')

app.use(bodyParser.urlencoded())

替换了app.use(express.bodyParser())还是不行，报了如下错误

D:\Mooc>node app.js

module.js:340

    throw err;

          ^

Error: Cannot find module 'body-parser'

    at Function.Module._resolveFilename (module.js:338:15)

    at Function.Module._load (module.js:280:25)

    at Module.require (module.js:364:17)

    at require (module.js:380:17)

    at Object.<anonymous> (D:\Mooc\app.js:8:18)

    at Module._compile (module.js:456:26)

    at Object.Module._extensions..js (module.js:474:10)

    at Module.load (module.js:356:32)

    at Function.Module._load (module.js:312:12)

    at Function.Module.runMain (module.js:497:10)

望老师执教！！！