/** * 获取上个月月底日期 */function getLastMonthAndDay(){    var nowDate = new Date();    var year = nowDate.getFullYear();    var month = nowDate.getMonth();    if(month == 0){        month = 12;        year = year - 1;    }    var lastDay = new Date(year,month,0);    var yyyyMMdd = year+"-"+month+"-"+lastDay.getDate();    console.log(yyyyMMdd);}