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可以加一个flash中间件的例子么

connect-flash和flash这两个包都试过了。

router.get('/login', (req, res) => {
	// 判断用户是否已经登录
	if (req.currentUser) {
		// 如果已经登录，发送当前登录用户信息。
		res.redirect('/users/profile')
	} else {
		// 没有登录，跳转到登录页面。
		console.log(req)
		res.render('login', {message: req.flash('error')})
	}
})

// 处理登录请求（可能来自登录界面中的表单）
router.post('/login', (req, res) => {
	AV.User.logIn(req.body.emailOrPhone, req.body.password).then((user) => {
		user.set('lastLoginIP', req.headers['x-real-ip'])
		user.save()
		res.saveCurrentUser(user) // 保存当前用户到 Cookie
		res.redirect('/users/profile') // 跳转到个人资料页面
	}, (error) => {
		//登录失败，跳转到登录页面
		console.log(error.code)
		req.flash('error', error.code)
		return res.redirect('/users/login')
	})
})

<!DOCTYPE HTML>
<html>
<head>
    <title>登陆</title>
</head>
<body>
<% if (flash) { %>
<p><%= flash.message %></p>
<% } %>
<form action="/users/login" method="post">
    <label>用户名/邮箱：</label>
    <input type="text" name="emailOrPhone" autocomplete="on" placeholder="用户名/邮箱">
    <label>密码：</label>
    <input type="password" name="password" autocomplete="off" placeholder="密码">
    <input type="submit" value="登陆"/>
</form>
</body>
</html>

const express = require('express')
const cookieParser = require('cookie-parser')
const cookieSession = require('cookie-session')
const AV = require('leanengine')
const flash = require('flash')

app.use(AV.Cloud.CookieSession({ secret: 'my secret', maxAge: 3600000, fetchUser: true }))
app.use(cookieSession({ name: 'session', keys: ['key1', 'key2'] }))
app.use(flash())