Cookie 操作

<script type="text/javascript" language="javascript">
<!--
//写入 cookie
//不区分 cookieName 的大小写
//不考虑子键
function ResponseCookies(cookieName, cookieValue, expires)
{
    if (expires)
    {
        //指定了 expires
        document.cookie = ResponseCookies_GetCookieName(cookieName) + "=" + escape(cookieValue) + "; expires=" + expires.toGMTString();
    }
    else
    {
        document.cookie = ResponseCookies_GetCookieName(cookieName) + "=" + escape(cookieValue);
    }
}

//获取并返回与 cookieName 同名的 cookie 名称，允许大小写不同
//如果不存在这样的 cookie，就返回 cookieName
function ResponseCookies_GetCookieName(cookieName)
{
    var lowerCookieName = cookieName.toLowerCase();
    var cookieStr = document.cookie;
   
    if (cookieStr == "")
    {
        return cookieName;
    }
   
    var cookieArr = cookieStr.split("; ");
    var pos = -1;
    for (var i=0; i<cookieArr.length; i++)
    {
        pos = cookieArr[i].indexOf("=");
        if (pos > 0)
        {
            if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName)
            {
                return cookieArr[i].substring(0, pos);
            }
        }
    }
   
    return cookieName;
}

//获取并返回 cookie 值
//不区分 cookieName 的大小写
//dfltValue 为默认返回值
//不考虑子键
function RequestCookies(cookieName, dfltValue)
{
    var lowerCookieName = cookieName.toLowerCase();
    var cookieStr = document.cookie;
   
    if (cookieStr == "")
    {
        return dfltValue;
    }
   
    var cookieArr = cookieStr.split("; ");
    var pos = -1;
    for (var i=0; i<cookieArr.length; i++)
    {
        pos = cookieArr[i].indexOf("=");
        if (pos > 0)
        {
            if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName)
            {
                return unescape(cookieArr[i].substring(pos+1, cookieArr[i].length));
            }
        }
    }
   
    return dfltValue;
}

document.write("写入名称为 cv 的 cookie...<br>");
ResponseCookies("cv", "cv20", null);

document.write("写入名称为 Ab，带失效日期的 cookie...<br>");
var expires = new Date("December 31, 2045");
ResponseCookies("Ab", "Ab20", expires);

document.write("读取名称为 ab 的 cookie..." + RequestCookies("ab", ""));
-->
</script>

****************************************************************************

function GetCookieVal(offset)
//获得Cookie解码后的值
{
    var endstr = documents.cookie.indexOf(";", offset);
    if (endstr == -1)
        endstr = documents.cookie.length;
    return unescape(documents.cookie.substring(offset, endstr));
}
function SetCookie(name, value)
//设定Cookie值
{
    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));
    documents.cookie = name + "=" + escape(value) + ((expires == null) ? "" : (";  expires=" + expdate.toGMTString()))
+ ((path == null) ? "" : (";  path=" + path)) + ((domain == null) ? "" : (";  domain=" + domain))
+ ((secure == true) ? ";  secure" : "");
}
function DelCookie(name)
//删除Cookie
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = GetCookie(name);
    documents.cookie = name + "=" + cval + ";  expires=" + exp.toGMTString();
}
function GetCookie(name)
//获得Cookie的原始值
{
    var arg = name + "=";
    var alen = arg.length;
    var clen = documents.cookie.length;
    var i = 0;
    while (i < clen) {
        var j = i + alen;
        if (documents.cookie.substring(i, j) == arg)
            return GetCookieVal(j);
        i = documents.cookie.indexOf("  ", i) + 1;
        if (i == 0) break;
    }
    return null;
}

******************************************************************

//写cookies函数 作者：翟振凯
function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值
{
    var Days = 30; //此 cookie 将被保存 30 天
    var exp  = new Date();    //new Date("December 31, 9998");
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
function getCookie(name)//取cookies函数        
{
    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
     if(arr != null) return unescape(arr[2]); return null;

}
function delCookie(name)//删除cookie
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=getCookie(name);
    if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}