js获取上个月

https://www.cnblogs.com/qiao20/p/9553177.html

https://www.cnblogs.com/zhangxiaoxia/p/9987340.html

function getLastMonthDate(){
    var nowdays = new Date();
    var year = nowdays.getFullYear();
    var month = nowdays.getMonth();
    if(month==0){
        month = 11;
        year = year-1;
    }
    var mydate=new Date(year,(month+1),0)

    var startDate = new Date(year,month,1,0,0,0);
    var endDate = new Date(year,month,mydate.getDate(),23,59,59);
    return [startDate.getTime(),endDate.getTime(),(month+1)]
}