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document.write("当前时间的36天前为：" + getNowFormatDate(36));
function getNowFormatDate(s) {
    var date = new Date();
    var seperator1 = "-";
    var seperator2 = ":";
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    var shi = date.getHours();
    var fen = date.getMinutes();
    var miao = date.getSeconds();
    var nian = date.getFullYear();
    var sjif = strDate - s;
    if (sjif > 0) {
        strDate = sjif
    } else {
        var i = 1;
        sjif = sjif - sjif * 2 // 80
        //构造一个日期对象：
        var sgy = month - i;
        if (sgy <= 0) {
            sgy = sgy - sgy * 2;
            sgy = 12 - sgy;
        }
        if (s >= 365) {
            nian = nian - 1;
        }
        var day = new Date(date.getFullYear(), sgy, 0);
        //获取天数：
        var daycount = day.getDate();
        var yfif = daycount - sjif; // 31 - 80 = -49
        if (yfif > 0) {
            strDate = yfif;
            month = sgy;
        } else {
            dkbl()
        }
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