express-session(express4.0与express 3.0的区别)

express-session deprecated undefined resave option; provide resave option app.js:16:9
express-session deprecated undefined saveUninitialized option; provide saveUninitialized option app.js:16:9

app.use(session({
resave:false,//添加这行，重新保存：强制会话保存即使是未修改的；
saveUninitialized: true,//添加这行 ，强制“未初始化的”会话保存到存储
secret: settings.cookieSecret,
key: settings.db,//cookie name
cookie: {maxAge: 1000 * 60 * 60 * 24 * 30},//30 days
store: new MongoStore({
db: settings.db,
host: settings.host,
port: settings.port
})
}));