js查看cookie过期时间

function getCookieExpiration(cookieName) {
    const cookies = document.cookie.split(';');
    for (let i = 0; i < cookies.length; i++) {
        const cookie = cookies[i].trim();
        if (cookie.startsWith(cookieName + '=')) {
            const cookieParts = cookie.split('=');
            const cookieValue = decodeURIComponent(cookieParts[1]);
            const expiresMatch = cookieValue.match(/expires=([^;]+)/i);
            if (expiresMatch) {
                return new Date(expiresMatch[1]);
            }
        }
    }
    return null;
}

// 示例使用
const expirationDate = getCookieExpiration('myCookie');
if (expirationDate) {
    console.log('Cookie expires on:', expirationDate);
} else {
    console.log('Cookie does not have an expiration date.');
}