日期加n年n月n天是哪天

//periodUnit1年、2月、3天

//number 数量

//date 日期

functionDateAdd(periodUnit,number,date) {

    switch(periodUnit) {

        case'1': {

            date.setFullYear(date.getFullYear()+number);

            return date;

            break;

        }

        case'2': {

            date.setMonth(date.getMonth()+number);

            return date;

            break;

        }

        case'3': {

            date.setDate(date.getDate()+number);

            return date;

            break;

        }

        default: {

            date.setDate(date.getDate()+number);

            return date;

            break;

        }

    }

}