function GetTodayDateStr() {    var dd = new Date();    dd.setDate(dd.getDate());    var y = dd.getFullYear();    var m = dd.getMonth()+1;//获取当前月份的日期    var d = dd.getDate();    if(m<10){      m="0"+m;    }    if(d<10){      d="0"+d;    }    return y+"-"+m+"-"+d;  }  /***获取下一个月的输入日期*{param:DateTime} date 输入日期(YYYY-MM-DD)*{param:number } monthNum 月数*/function GetNextMonthDay (date, monthNum){var dateArr = date.split('-');var year = dateArr[0]; //获取当前日期的年份var month = dateArr[1]; //获取当前日期的月份var day = dateArr[2]; //获取当前日期的日var days = new Date(year, month, 0);days = days.getDate(); //获取当前日期中的月的天数var year2 = year;var month2 = parseInt(month) + parseInt(monthNum);if (month2 >12) {year2 = parseInt(year2) + parseInt((parseInt(month2) / 12 == 0 ? 1 : parseInt(month2) / 12));month2 = parseInt(month2) % 12;}var day2 = day;var days2 = new Date(year2, month2, 0);days2 = days2.getDate();if (day2 > days2) {day2 = days2;}if (month2 < 10) {month2 = '0' + month2;}var t2 = year2 + '-' + month2 + '-' + day2;return t2;}var today=GetTodayDateStr();var nextyear=GetNextMonthDay (today, 12);  alert(nextyear);