var discountOnline = !{discountOnline}
        if (discountOnline) {
            _fresh()
            setInterval(_fresh, 1000);
        }
        var nowtime = false;
        function _fresh() {
            var endtime = new Date("February 10, 2017 23:59:59");
            if(!nowtime){
                nowtime = !{dateTime};
            }
            var leftsecond = parseInt((endtime.getTime() - nowtime) / 1000);
            nowtime = nowtime + 1000;
            if (leftsecond < 0) {
                leftsecond = 0;
            }
            var _d = parseInt(leftsecond / 3600 / 24);
            var _h = parseInt((leftsecond / 3600) % 24);
            if (_h < 10) {
                _h = "0" + _h;
            }
            var _m = parseInt((leftsecond / 60) % 60);
            if (_m < 10) {
                _m = "0" + _m;
            }
            var _s = parseInt(leftsecond % 60);
            if (_s < 10) {
                _s = "0" + _s;
            }
            var _all = _d + " 天 " + _h + " 小时 " + _m + " 分 " + _s + " 秒";
            _all = _all.replace(/([0-9]{1})/g, ‘<img width="9" height="16" src="images/time/$1.png">‘)
            $(".time").find("span").html(_all);
        }
原文:http://www.cnblogs.com/smght/p/6703237.html