解决express-session模块报错：“deprecated undefined resave option; provide resave option app.js”

网站搬家，数据库自然也要搬家。之后运行node ./bin/www

报错：deprecated undefined resave option; provide resave option app.js

app.use(session({
   secret: 'myblog',
   key: 'blog',//cookie name
   cookie: {maxAge: 1000 * 60 * 60 * 24 * 30},//30 days
   store: new MongoStore({
       url: 'mongodb://blog:123@localhost:27017/blog'
   }),
   resave:false,//添加这行 
   saveUninitialized: true//添加这行
}));