​//写入Coolie
const set = (name, value, { maxAge, domain, path, secure } = {}) => {
    let coolieText = `${encodeURIComponent(name)}=${encodeURIComponent(value)}`;

    if (typeof maxAge === 'number') {
        coolieText += `; maxAge=${maxAge}`
    }

    if (domain) {
        coolieText += `; domain=${domain}`
    }

    if (path) {
        coolieText += `; path=${path}`
    }

    if (secure) {
        coolieText += `; secure`
    }

    document.cookie = coolieText;
};
//读写Coolie
const get = name => {
    name = `${encodeURIComponent(name)}`;
    const cookies = document.cookie.split('; ');
    for (const i of cookies) {
        const [cookieName, cookieValue] = i.split('=');
        if (cookieName === name) {
            return decodeURIComponent(cookieValue);
        }
    }
    return;
};
//删除Coolie
const remove = (name, { domain, path } = {}) => {
    set(name, '', { domain, path, maxAge: -1 });
};

export { set, get, remove };

而老师的是下面的这种，会显示undefined