需要用到中间件

koa-session-minimal,提供koa2中session的读写接口

koa-session-mongoose,提供mongoose数据库中session数据的读写操作

示例代码

const Koa = require('koa');

const mongoose = require('mongoose');

const session = require('koa-session-minimal');

const MongooseStore = require('koa-session-mongoose');

const app = new Koa();

mongoose.connect('mongodb://localhost:27017/test',{useMongoClient:true});

app.use(session({

store: new MongooseStore()

}));

app.use(async ctx => {

const { session } = ctx;

let n = session.views || 0;

session.views = ++n;

ctx.body = `${n} view(s)`;

});

app.listen(3000)

console.log('session is starting at port 3000');