js递归增加天数/减少天数

由于js中的setDate()溢出问题,所以使用js递归增加减少天数

function 获取当前月份的最大天数 (newyear, month) {var monthbs = [1,0,1,0,1,0,1,1,0,1,0,1];var monthMaxDays = 31;if (monthbs[month-1]<1) {if (month!=2) {monthMaxDays = 30;} else {if ((newyear % 4 == 0) && (newyear % 100 != 0 || newyear % 400 == 0)) {		// 二月时判断是否为闰年monthMaxDays = 29;} else {monthMaxDays = 28;}}}return monthMaxDays;
}
function 递归计算天数 (year, month, day, delayTime) {var newyear = year;//获取存储新的年份var newmonth = month;//当前月份var newday = day + delayTime;//加过时间吼的日期var monthMaxDays = 获取当前月份的最大天数(year, month); //当月最大值if(newday>0 && newday<=monthMaxDays){//当前月份是否够加/够减，是否当前日期溢出,为正数,并且日期不溢出newmonth =parseInt(newmonth)>9?newmonth:0+''+newmonth;newday = parseInt(newday)>9?newday:0+''+newday;return newyear + "-" + newmonth + "-" + newday;}else {//溢出加一个月/减一个月newmonth =newday>0? month+1:month-1; //正数执行步骤var newdelay = newday>0?newday-monthMaxDays:newday;if (newmonth>12) {//月份是否溢出newyear = newyear + 1;newmonth = newmonth - 12;}else if(newmonth<0){//月份是否溢出newyear= newyear-1;newmonth=newmonth+12;}newday=newday<0?newday = 获取当前月份的最大天数(year, newmonth):0;//newday是只下一个阶段的还需要计算的天数return 递归计算天数(newyear, newmonth, newday, newdelay);}
}function addDayTime(dd, AddDayCount) {if (!(dd instanceof Date)) {dd = getDateTime(dd);}if (!AddDayCount) {AddDayCount = 0;}return  递归计算天数(dd.getFullYear(),dd.getMonth()+1,dd.getDate(),AddDayCount);
}

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