js判断session过期

function checkSessionStatus() {
    return fetch('/check-session') // 假设服务器有一个检查session的接口
        .then(response => {
            if (response.ok) {
                return response.json();
            } else {
                throw new Error('Network response was not ok.');
            }
        })
        .then(data => {
            if (data.sessionValid === false) {
                alert('Session expired!');
                // 这里可以重定向到登录页面
                window.location.href = '/login';
            }
        })
        .catch(error => {
            console.error('There has been a problem with your fetch operation:', error);
        });
}

// 定期检查session状态
setInterval(checkSessionStatus, 60000); // 每分钟检查一次

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

function isSessionCookieExpired() {
    const sessionCookie = getCookie('sessionId'); // 假设session ID存储在名为'sessionId'的cookie中
    if (sessionCookie) {
        const cookieParts = sessionCookie.split(';');
        for (let part of cookieParts) {
            if (part.trim().startsWith('expires=')) {
                const expiresDate = new Date(part.substring(8));
                if (expiresDate < new Date()) {
                    return true; // Cookie已过期
                }
                break;
            }
        }
    }
    return false; // 没有找到过期时间或未过期
}

// 使用示例
if (isSessionCookieExpired()) {
    alert('Session expired!');
    window.location.href = '/login';
}