js检测session状态

function getCookie(name) {
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) return parts.pop().split(';').shift();
}

const sessionId = getCookie('sessionId'); // 假设session ID存储在名为'sessionId'的cookie中
if (sessionId) {
    console.log('Session exists');
} else {
    console.log('No session found');
}

fetch('/check-session', {
    method: 'GET',
    credentials: 'same-origin' // 确保发送cookie
})
.then(response => response.json())
.then(data => {
    if (data.sessionExists) {
        console.log('Session exists');
    } else {
        console.log('No session found');
    }
})
.catch(error => console.error('Error:', error));

app.get('/check-session', (req, res) => {
    if (req.session && req.session.user) {
        res.json({ sessionExists: true });
    } else {
        res.json({ sessionExists: false });
    }
});