JavaScript的Cookie操作函数

封装好的javascript读取cookie,删除cookie,更改cookie函数,非常好用.

//获得Cookie解码后的值
function GetCookieVal(offset) {
    var endstr = document.cookie.indexOf (";", offset);
    if (endstr == -1)
    endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}
 
 
//设定Cookie值
function SetCookie(name, value) {
    var expdate = new Date();
    var argv = SetCookie.arguments;
    var argc = SetCookie.arguments.length;
    var expires = (argc > 2) ? argv[2] : null;
    var path = (argc > 3) ? argv[3] : null;
    var domain = (argc > 4) ? argv[4] : null;
    var secure = (argc > 5) ? argv[5] : false;
    if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));
    document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))

    +((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
    +((secure == true) ? "; secure" : "");
}
 
 
//删除Cookie
function DelCookie(name) {
    var exp = new Date();
    exp.setTime (exp.getTime() - 1);
    var cval = GetCookie (name);
    document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}
 
 
//获得Cookie的原始值
function GetCookie(name) {
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen)
    {
        var j = i + alen;
        if (document.cookie.substring(i, j) == arg)
        return GetCookieVal (j);
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) break;
    }
    return null;
}

延伸阅读:
PHP中对Session和Cookie的区分与理解
php中Cookie的简介及使用方法
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Discuz!登陆验证Cookie机制分析
php中Cookie介绍及其使用
PHP设置COOKIE保留时间为浏览器进程
php 中session和cookie的区别
php中Cookie简介及其使用
各种浏览器对Cookie的限制
php中的cookie
PHP基础:Session与Cookie

php中session和cookie的一些资料整理
PHP CURL 发送COOKIE
PHP curl实现get、post和cookie提交实例讲解
PHP CURL中传递cookie的方法
javascript cookies 存、取、删除实例