express中使用express-session记录登陆状态

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

app.use(session({
    secret: ‘keyboard cat‘,
    resave: false,
    saveUninitialized: true
}));

app.get("/",function(req,res){
    if(req.session.login === "1"){
        res.send("欢迎" + req.session.username);
    }else{
        res.send("没有成功登陆");
    }
});

app.get("/login",function(req,res){
    req.session.login = "1";    //设置这个session
    req.session.username = "小明";
    res.send("你已经成功登陆");
});

app.listen(3000);