js中的cookie的设置

function SetCookie(name, value) {
    var exp = new Date();
    exp.setTime(exp.getTime() + 3600000000); //设置他的过期的时间
    document.cookie = name + "=" + value + "; expires=" + exp.toGMTString() + "; path=/";
}
function getCookieval_r(offset) {
    var endstr = document.cookie.indexOf(";", offset);
    if (endstr == -1) endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}
function DelCookie(name) {
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = GetCookie(name);
    document.cookie = name + "=" + '' + "; expires=" + exp.toGMTString() + "; path=/"; 如果想要删除要和设置的时候的路径完全一致
   
}
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_r(j);
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) break;
    }
    
    return null;
}