模块版本更新导致用法改变 app.js

app.use(session({
  secret: settings.cookieSecret,
  key: settings.db,//cookie name
  cookie: {maxAge: 1000 * 60 * 60 * 24 * 30},//30 days
  store: new MongoStore({
    url: settings.url
  }),
  resave: true,
  saveUninitialized: false
}));

setting.js

module.exports = {
  cookieSecret: 'myblog',
  db: 'blog',
  host: 'localhost',
  port: 27017,
  url: 'mongodb://localhost/blog'
};