获得当前日期n天之前的日期
function getBeforeDate(n){
var n = n;
var d = new Date();
var year = d.getFullYear();
var mon=d.getMonth()+1;
var day=d.getDate();
if(day <= n){
if(mon>1) {
mon=mon-1;
}else {
year = year-1;
mon = 12;
}
}
d.setDate(d.getDate()-n);
year = d.getFullYear();
mon=d.getMonth()+1;
day=d.getDate();
s = year+"-"+(mon<10?('0'+mon):mon)+"-"+(day<10?('0'+day):day);
return s;
}
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