function getLastMonth(){//获取上个月日期
var date = new Date;
var year = date.getFullYear();
var month = date.getMonth();
if(month == 0){
year = year -1;
month = 12;
}
return year+"年"+month+"月";
}
/**
* 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+"年"+month+"月"+lastDay.getDate()+"日";
console.log(yyyyMMdd);
}