function getUpMonth(t){

    var tarr = t.split('-');

    var year = tarr[0];                //获取当前日期的年

    var month = tarr[1];            //获取当前日期的月

    var day = tarr[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)-1;

    if(month2==0) {

        year2 = parseInt(year2)-1;

        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;

}

function getUpMonth(t){

    var year =t.substring(0,4);            //获取当前日期的年

    var month = t.substring(4,6);              //获取当前日期的月

    var year2 = year;

    var month2 = parseInt(month)-1;

    if(month2==0) {

        year2 = parseInt(year2)-1;

        month2 = 12;

    }

    if(month2<10) {

        month2 = '0'+month2;

    }

    var m = year2.toString();

    var n= month2.toString();

    var t2 = m+n;

    return t2;

}