js时间加往后延

function AddDays(date, days) {
    var nd = new Date(date);
    nd = nd.valueOf();
    nd = nd + days * 24 * 60 * 60 * 1000;
    nd = new Date(nd);
    var y = nd.getFullYear();
    var m = nd.getMonth() + 1;
    var d = nd.getDate();
    if (m <= 9) m = "0" + m;
    if (d <= 9) d = "0" + d;
    var cdate = y + "-" + m + "-" + d;
    return cdate;
}