一、   cookie  

        1,引入模块

                var express = require ("express");
                var app = express();
                var  cookieParser =  require ("cookie-parser");

        2,中间件引用

                app.use(cookieParser());

        3,设置cookie

                //设置过期时间两种方式
               // 1,maxAge     maxAge:1000*60*60(代表1小时之后过期)
                2,expires   当前时间+过期时间GMT
                    var nowtime = new Date();
                    nowtime.setDate(nowtime.getDate()+7);
                app.get("/setcookie",function(req,res){
                        res.cookie("username","李四",{
                                expires:nowtime
                        })
                    res.send("<h1>设置cookie页面</h1>")
                })

        4,获取cookie

            app.get("/getcookie",function(res,req){
                    var username = req.cookies.username;
                    res.send("<h1>用户名是${username}</h1>");
            })
            app.listen(8989);

二、 session

        1,引入模块

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

        2,中间件引用,配置

                app.use(session({
                        secret : "mysecret",
                        resave:false,
                        saveUninitialized:false
                }))

    3,设置session

        app.get("/setsession",(req.res)=>{
                req.session.username="erha";
                res.send("<h1>设置session界面</h1>");
        })

4,获取session

        app.get("/getsession",(req,res)=>{
                var username = req.session.username;
                res.send("<h1>用户名是${username}</h1>")
        })
    app.listen(8686);

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