JS对cookie的读取、修改、删除

读取cookie转化为JS对象

function getCookie() {
    var jsCookie = {};
    var cookie = document.cookie;
    if (cookie === '') {
        return jsCookie;
    }
    //cookie是以分号和一个空格隔开的一系列键值对
    var cookieList = cookie.split('; ')
    for (var i = 0; i < cookieList.length; i++) {
        //取出一个cookie数组中的元素
        var item = cookieList[i];
        //找出每一个元素中“=”所在的位置
        var index = item.indexOf('=');
        //以下分开“=”前后作为key和value
        var name = item.substring(0, index);
        //解码
        name = decodeURIComponent(name);
        var value = item.substring(index + 1);
        value = decodeURIComponent(value);
        //写入jsCookie对象中，自动添加新增
        jsCookie[name] = value;
    }
    return jsCookie;
}

修改cookie

function setCookie(name, value, expires, path, domain, secure) {
    var cookie = encodeURIComponent(name) + '=' + encodeURIComponent(value);
    if (expires) {
        cookie += '; expires=' + expires;
    }
    if (path) {
        cookie += '; path=' + path;
    }
    if (domain) {
        cookie += '; domain=' + domain;
    }
    if (secure) {
        cookie += '; secure=' + secure;
    }
    document.cookie = cookie;
}

删除cookie

function deleteCookie(name, path, domain) {
    document.cookie = 'name=' + name + '; 
    path=' + path + '; 
    domain=' + domain + '; 
    max-age=0';
}//name+path+domain即可确定唯一cookie,将其max-age设置为0即等同于删除。