简单的js日期处理方法

adddate是抄的网上的

var curFirstDay = new Date(inputDate.getYear(), inputDate.getMonth());
            //下月开始的第一天   
            var nextFirstDay = addDate('5', '1', curFirstDay);
            //本月最后一天   
            var curEndDay = new Date(nextFirstDay.getTime() - 1);
            var obj = curEndDay.getYear() + '-' + (curEndDay.getMonth() + 1) + '-' + curEndDay.getDate();

function addDate(type, NumDay, vdate) {
                var date = new Date(vdate);
                type = parseInt(type) //类型    
                var lIntval = parseInt(NumDay)//间隔   
                switch (type) {
                    case 6: //年   
                        date.setYear(date.getYear() + lIntval)
                        break;
                    case 7: //季度   
                        date.setMonth(date.getMonth() + (lIntval * 3))
                        break;
                    case 5: //月   
                        date.setMonth(date.getMonth() + lIntval)
                        break;
                    case 4: //天                    
                        date.setDate(date.getDate() + lIntval)
                        break;
                    case 3: //时   
                        date.setHours(date.getHours() + lIntval)
                        break;
                    case 2: //分   
                        date.setMinutes(date.getMinutes() + lIntval)
                        break;
                    case 1: //秒   
                        date.setSeconds(date.getSeconds() + lIntval)
                        break;
                    default:

                }
                return date;
            }