jquery修改cookie其中一个值

function setCookie(name, value, days) {
    var expires = "";
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        expires = "; expires=" + date.toUTCString();
    }
    document.cookie = name + "=" + (value || "") + expires + "; path=/";
}

function getCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
    return null;
}

function updateCookieValue(name, newValue) {
    var currentValue = getCookie(name);
    if (currentValue !== null) {
        setCookie(name, newValue, currentValue.split(";")[1].trim().split("=")[1]);
    } else {
        console.log("Cookie not found");
    }
}

// 示例：修改名为 userPreference 的 Cookie 的值
updateCookieValue("userPreference", "new_value");