js根据年月得到当前这个月总共有多少天

let curmonth;

var curDay=this.getday(this.year,this.month);

if(this.month >=10)

{

var curDate = this.year + "-" + this.month + "-" + "01";

var toDate=this.year + "-" + this.month + "-" + curDay;

}

else

{

curmonth= "0"+this.month;

var curDate = this.year + "-" + curmonth + "-" + "01";

var toDate=this.year + "-" + curmonth + "-" + curDay;

}

 

getday(year, month) {

var day = new Date(year, month, 0);

return day.getDate();

},

  //获取离当月还剩多少天 
 getDayByDate() {
      var today = new Date();
      var now = today.getDate();
      var year = today.getYear();
      if (year < 2000) year += 1900; // Y2K fix
      var month = today.getMonth();
      var monarr = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
      if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) monarr[1] = "29";
      document.write("这个月还剩 " + (monarr[month] - now) + " 天了");

    },