JS month, date plus day

JS is not directly available functions, so can only write their own, which need to relate to the judgment of the number of days per month, if it is February, but also related to the judgement of leap years

1 varAdddate = {2         //date, based on the original date, increase days, by default 1 days3SetDate:function(date, days) {4             if(days = = Undefined | | days = = ") {5Days = 1;6             }7             varDate =Newdate (date);8Date.setdate (date.getdate () +Days );9             varmonth = Date.getmonth () + 1;Ten             varDay =date.getdate (); One             returnDate.getfullyear () + '-' + This. Getformatdate (month) + '-' + This. Getformatdate (day); A         }, -         //Date Month/day display, if 1 digits, precede with ' 0 ' -Getformatdate:function(ARG) { the             if(arg = = Undefined | | arg = = ") { -                 return‘‘; -             } -             varRe = arg + '; +             if(Re.length < 2) { -Re = ' 0 ' +re; +             } A             returnre; at         } -}

JS month, date plus day