js cookie utf8

function setCookie(name, value, days) {
    let expires = "";
    if (days) {
        const date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        expires = "; expires=" + date.toUTCString();
    }
    // 先将字符串编码为UTF-8，然后进行Base64编码
    const encodedValue = btoa(unescape(encodeURIComponent(value)));
    document.cookie = name + "=" + encodedValue + expires + "; path=/";
}

setCookie('user', '张三', 7); // 设置一个包含中文字符的Cookie，有效期为7天

function getCookie(name) {
    const nameEQ = name + "=";
    const ca = document.cookie.split(';');
    for (let i = 0; i < ca.length; i++) {
        let c = ca[i];
        while (c.charAt(0) === ' ') c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) === 0) {
            // 解码Base64并转换回UTF-8字符
            return decodeURIComponent(escape(atob(c.substring(nameEQ.length, c.length))));
        }
    }
    return null;
}

console.log(getCookie('user')); // 输出: 张三