js创建cookie js设置cookie过期时间

//取Cookie的值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;} //写入到Cookie//name:cookie名称  value:cookie值 function SetCookie(name, value) {    var Days = 30;    var exp = new Date();    exp.setTime(exp.getTime() + 60 * 2000);//过期时间 2分钟    document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();}function getCookieVal(offset) {    var endstr = document.cookie.indexOf(";", offset);    if (endstr == -1) endstr = document.cookie.length;    return unescape(document.cookie.substring(offset, endstr));}

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