var nowdays = new Date();
var year = nowdays.getFullYear();
var month = nowdays.getMonth();
if (month == 0) {
month = 12;
year = year - 1;
}
if (month < 10) {
month = "0" + month;
}
var firstDay = year + "-" + month + "-" + "01";// 上个月的第一天
var myDate = new Date(year, month, 0);
var lastDay = year + "-" + month + "-" + myDate.getDate();// 上个月的最后一天
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