NodeJS - Express4.0錯誤：Cannot read property 'Store' of undefined

Express在使用mongodb的時候app配置出錯

//settings.js

module.exports={

cookieSecret:"xxxx",

db:"dbname",

host:"localhost",

}

//app.js

var express = require("express");

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

載入connect-mongo的出錯寫法：

var MongoStore=require("connect-mongo")(express);

app.use(express.session({
secret:Settings.cookieSecret,
key:Settings.db,
cookie:{maxAge:1000*60*60*24*30},//30 days
store:new MongoStore({
db:Settings.db
})
}));

啟動後報錯：TypeError: Cannot read property 'Store' of undefined

以上是 express<4的寫法

express 4.0之後（包括4.0）寫法如下：

var session = require("express-session");

var MongoStore=require("connect-mongo")(session);

app.use(session({

secret:settings.cookieSecret,

store:new MongoStore({

db:settings.db

})

});

package.json配置如下

{
"name": "dbTest",
"version": "0.0.1",
"private": true,
"scripts": {
"start": "node ./bin/www"
},
"dependencies": {
"express": "~4.2.0",
"static-favicon": "~1.0.0",
"morgan": "~1.0.0",
"cookie-parser": "~1.0.1",
"body-parser": "~1.0.0",
"debug": "~0.7.4",
"ejs": "~0.8.5",
"mongodb":"*",
"connect-mongo":"*",
"express-session":"*"
}
}

//如果目錄下沒有執行過npm install請在增加mongodb,connect-mongo,express-session之後在package.json目錄下執行一下npm install

以上是express中對mongodb的配置，如果你本地沒有裝mongodb的資料庫請到http://www.mongodb.org/downloads下載安裝。