js获取本月起止日期和结束日期

 Datestartstop(){
            function getMonth(type, months) {
                var d = new Date();
                var year = d.getFullYear();
                var month = d.getMonth() + 1;
                if (Math.abs(months) > 12) {
                    months = months % 12;
                };
                if (months != 0) {
                    if (month + months > 12) {
                        year++;
                        month = (month + months) % 12;
                    } else if (month + months < 1) {
                        year--;
                        month = 12 + month + months;
                    } else {
                        month = month + months;
                    };
                };
                month = month < 10 ? "0" + month: month;
                var date = d.getDate();
                var firstday = year + "-" + month + "-" + "01";
                var lastday = "";
                if (month == "01" || month == "03" || month == "05" || month == "07" || month == "08" || month == "10" || month == "12") {
                    lastday = year + "-" + month + "-" + 31;
                } else if (month == "02") {
                    if ((year % 4 == 0 && year % 100 != 0) || (year % 100 == 0 && year % 400 == 0)) {
                        lastday = year + "-" + month + "-" + 29;
                    } else {
                        lastday = year + "-" + month + "-" + 28;
                    };
                } else {
                    lastday = year + "-" + month + "-" + 30;
                };
                var day = "";
                if (type == "s") {
                    day = firstday;
                } else {
                    day = lastday;
                };
                return day;
            };
            return [getMonth("s",0),getMonth("e",0)]
        },