js中cookie的使用

//注意。。。要启动服务器才能启用cookiefunction SetCookie(name, value){    var expdate = new Date();    var argv = SetCookie.arguments;    var argc = SetCookie.arguments.length;    var expires = (argc > 2) ? argv[2] : null;    //alert("expires:"+expires);    var path = (argc > 3) ? argv[3] : null;    //alert("path:"+path);    var domain = (argc > 4) ? argv[4] : null;    //alert("domain:"+domain);    var secure = (argc > 5) ? argv[5] : false;    //alert("secure:"+secure);    //设置cookie有效期为60*30天，可以自行更改或者将过期时间设为参数    expdate.setTime(expdate.getTime() + ( 60 * 30 * 24 * 60 * 60 * 1000 ));    document.cookie = name + "=" + escape (value) + "; expires="+ expdate.toGMTString()    +((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))    +((secure == true) ? "; secure" : "");}//==========================================================//2.    读取Cookiefunction 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 "";}//==========================================================//3.    删除Cookiefunction DelCookie(name){    var exp = new Date();    exp.setTime (exp.getTime() - 1);    var cval = GetCookie (name);    document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();}