获取当前月份的开始时间和结束时间

// 获取当前月份的开始时间和结束时间
        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;
        },

console.log([this.getMonth("s", 0), this.getMonth("e", 0)])