session与cookie保留用户登录状态
npm i express-sessionconst session=require("express-session")
//配置session
app.use(session({
secret: 'encoded', //加密字符串
resave: false,
saveUninitialized: true //为真则不管你存不存数据都会分配一把钥匙给客户端
}))
app.use(studenter_router) //挂载student路由
app.use(teacher_router) //挂载teacher路由
app.use(register_router) //挂载teacher路由关于session中几个参数的说明
session信息保存到数据库中
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