node-cookie-parserDemo

let express = require('express');
let app = new express();

let cookieParser = require('cookie-parser');

app.use(cookieParser());

app.get('/',(req,res)=>{
    res.send('您浏览过的城市'+ req.cookies.citys);
});

// app.get('/lvyou/:city',(req,res)=>{
//     console.log(req.params);
//     res.send('123');
// });
app.get('/lvyou',(req,res)=>{
   let city =  req.query.city;
   let arr = req.cookies.citys;
   if(arr){
    arr.push(city);
   }else{
       arr = [];
       arr.push(city);
   }
    res.cookie('citys',arr,{maxAge:1000*60*10});
    res.send(arr);
});
app.listen(3000,()=>{
    console.log('go');
})

使用cookie来保存一些信息实现城市浏览记录。