var d = new Date();
var year = d.getFullYear();
var month = d.getMonth()+1;
var day = d.getDate();
//算出前180天的时间戳
var o = new Date(d.getTime()-180*24*60*60*1000);
var oyear = o.getFullYear();
var omonth = o.getMonth()+1;
var oday = o.getDate();
var date = []
setTimeout(function(){
	//判断半年前是否今年
	//不是今年
	if (year!=oyear) {
		monthFn(oyear,omonth,oday)
		for (var m = omonth+1; m <= 12; m++) {
			monthFn(oyear,m,1)
		}
		for (var m = 1; m <=month-1; m++) {
			monthFn(year,m,1)
		}
		for (var i = 1; i <= day; i++) {
			date.push(year +"/"+ month +"/"+ i)
		}
	}
	//是今年
	else{
		monthFn(oyear,momonth,oday)
		for (var m = omonth-1; m <= month-1; m++) {
			monthFn(oyear,m,1)
		}
		for (var i = 1; i <= day; i++) {
			date.push(year +"/"+ month +"/"+ i)
		}
	}
	console.log(date)
},100)
//判断是否闰年
function isLeapYear(){   
    return (0==this%4&&((this%100!=0)||(this%400==0)));   
} 
//判断月份
function monthFn(y,m,d){
	//2月份
		if(m == 2){
			if (isLeapYear(y)) {
				for (var i = d; i <= 29; i++) {
					date.push(y +"/"+ m +"/"+ i)
				}
			}
			else{
				for (var i = d; i <= 28; i++) {
					date.push(y +"/"+ m +"/"+ i)
				}
			}
		}
	//31天月
		if(m == 1|| m == 3||m == 5||m == 7||m == 8||m == 10||m == 12){
			for (var i = d; i <= 31; i++) {
				date.push(y +"/"+ m +"/"+ i)
			}
		}
	//30天月
		if(m == 4||m == 6||m == 9||m == 11){
			for (var i = d; i <= 30; i++) {
				date.push(y +"/"+ m +"/"+ i)
			}
		}
}