使用JavaScript获取日期加随机数生成单号

今天学习Javascript,得到一个自动生成单号的JavaScript,留下日后备用:

        function getNowFormatDate() {
            var day = new Date();
            var Year = 0;
            var Month = 0;
            var Day = 0;
            var CurrentDate = "";
            Year = day.getFullYear(); //支持IE和火狐浏览器.
            Month = day.getMonth() + 1;
            Day = day.getDate();
            CurrentDate += Year;
            if (Month >= 10) {
                CurrentDate += Month;
            }
            else {
                CurrentDate += "0" + Month;
            }
            if (Day >= 10) {
                CurrentDate += Day;
            }
            else {
                CurrentDate += "0" + Day;
            }
            return CurrentDate;
        }

        var OrderID = getNowFormatDate() + Math.floor(Math.random() * 1000);

        document.write("随机单号:" + OrderID + "<br />");