Set-Cookie:name=gjr; Path=/

Cookie:name=gjr

res.cookie(name,value,[,options]);

npm install cookie-parser --save

app.use(require('cookie-parser')());    
response.cookie(key,value)              //在响应中向客户端设置cookie
request.cookies                         //获取请求中的cookie对象
response.clearCookie('username')        //清除cookie

var express = require('express');
var cookieParser = require('cookie-parser');
var app = express();
/**
 * 如果要加密的话 cookieParser里要指定密码，而且signed要等于true res.cookie('name','zfpx',{signed:true});
 */
app.use(cookieParser('zfpx'));
app.get('/write',function(req,res){
    //1.普通设置
    //res.cookie('name','value');
    //2.设置域名
    //res.cookie('name','zfpx',{domain:'a.zfpx.cn'});
    //3.设置路径
    //res.cookie('name','zfpx',{path:'/visit'});
    //4.过期时间
    //res.cookie('name','zfpx',{expires:new Date(Date.now()+20*1000)});//毫秒
    //res.cookie('name','zfpx',{maxAge:20*1000});//过期时间 毫秒
    //httpOnly true还是false无意义 document.cookie取不到
    //res.cookie('name','zfpx',{httpOnly:true});
    res.cookie('age','123',{signed:true});
    res.end('ok');
});
app.get('/read',function(req,res){
    console.log(req.signedCookies);
    res.send(req.cookies);
});
//记录这是客户端的第几次访问
app.get('/visit',function(req,res){
    res.cookie('count',isNaN(req.cookies.count)?0:parseInt(req.cookies.count)+1);
    res.send(req.cookies);
});
app.listen(9090);

function (secret){
  return function (req, res, next){
    req.secret = secret;  
    if (!req.headers.cookie) {
        return next();
    }
    req.cookies =  require('querystring').parse(req.headers.cookie,'; ','=');
    if(req.secret){
        req.signedCookies = {};
        for(let attr in req.cookies){
                let val = req.cookies[attr];
                req.signedCookies[attr] = unsign(val, secret);
            }
        }
    }
    next();
  }
}
function cookie(name, val, options) {
    var opt = options || {};
    val = encodeURIComponent(val);
    if(opt.secret){
        var secret = this.req.secret;
        val = sign(val,this.secret);
    }
    var pairs = [name + '=' + value];
    if (null != opt.maxAge) {
        var maxAge = opt.maxAge - 0;
        if (isNaN(maxAge)) throw new Error('maxAge should be a Number');
        pairs.push('Max-Age=' + Math.floor(maxAge));
    }
    if (opt.domain) {
        pairs.push('Domain=' + opt.domain);
    }
    if (opt.path) {
        pairs.push('Path=' + opt.path);
    }
    if (opt.expires) pairs.push('Expires=' + opt.expires.toUTCString());
    if (opt.httpOnly) pairs.push('HttpOnly=true');
    if (opt.secure) pairs.push('Secure=true');
    return pairs.join('; ');
}
var crypto = require('crypto');
exports.sign = function(val, secret){
  return val + '.' + crypto
    .createHmac('sha256', secret)
    .update(val)
    .digest('base64')
    .replace(/=+$/, '');
};
exports.unsign = function(val, secret){
  var str = val.slice(0, val.lastIndexOf('.'))
    , mac = exports.sign(str, secret);
  return mac == val ? str : false;
};

var express = require('express');
var cookieParser = require('cookie-parser');
var app = express();
app.set('view engine','html');
app.engine('html',require('ejs').__express);
app.set('views',__dirname);
app.use(cookieParser());
function checkUser(req,res,next){
    if(req.cookies && req.cookies.username)
      next();
    else
      res.redirect('/');
}
//进入登录页
app.get('/',function(req,res){
    res.render('index');
});
//登录
app.get('/login',function(req,res){
    res.cookie('username',req.query.username,{httpOnly:true});
    res.redirect('/user');
});
//用户页面
app.get('/user',checkUser,function(req,res){
    res.render('user',{username:req.cookies.username});
});
//用户退出
app.get('/logout',function(req,res){
    res.clearCookie('username');//清除cookie
    res.redirect('/');
});
app.listen(8080);