js倒计时代码

<script language="javascript" type="text/javascript">  
function Timer(year,month,day,hour,minute,second){
  var leftTime = (new Date(year,month-1,day,hour,minute,second)) - (new Date()); //计算剩余的毫秒数
  var days = parseInt(leftTime / 1000 / 60 / 60 / 24 , 10); //计算剩余的天数
  var hours = parseInt(leftTime / 1000 / 60 / 60 % 24 , 10); //计算剩余的小时
  var minutes = parseInt(leftTime / 1000 / 60 % 60, 10);//计算剩余的分钟
  var seconds = parseInt(leftTime / 1000 % 60, 10);//计算剩余的秒数
  days = checkTime(days);
  hours = checkTime(hours);
  minutes = checkTime(minutes);
  seconds = checkTime(seconds);
  setInterval("Timer(2018,10,20,00,00,00)",1000);
// console.log(days);
  if (isNaN(days)) { }
  else{
   
     document.getElementById("daya").innerHTML = days;
     document.getElementById("houra").innerHTML = hours;
     document.getElementById("minutea").innerHTML = minutes;
     document.getElementById("seconda").innerHTML = seconds;

  }
  
}
function checkTime(i){ //将0-9的数字前面加上0,例1变为01
  if(i<10)
  {
    i = "0" + i;
  }
  return i;
}
  
</script>
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