JavaScript gets a few months in the past

Finishing:

If you need to get the last few months, involving the cross-year, how to achieve the problem, took some time, the code is as follows:

    /** Epoch time get last 12 months * * @num number of incoming month **/    (functiongetMonth (num) {var_curdate =NewDate (), _curtime= _curdate.gettime (),//Current era time_onedaytime = 24 * 3600 * 1000,//the total number of milliseconds in a day_thismonsumday =NewDate (_curdate.getfullyear (), _curdate.getmonth () + 1, 0). GetDate ();//total number of days in the current month        var_resultarr = [];  for(vari = 1, j = _curtime; I <= num; i++, J-= _thismonsumday *_onedaytime) {            //Monthly Iteration            if(_resultarr.length >=num) {                 Break; }            //the time point of the month, as the current month basis            var_thismonth =NewDate (j); //re-assignment current month days_thismonsumday =NewDate (_thismonth.getfullyear (), _thismonth.getmonth () + 1, 0). GetDate (); _resultarr.push (DateFormat ("Yyyy-mm",NewDate (j))); }        return_resultarr; })(38);

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JavaScript gets a few months in the past