用户购买后每分钟递增001否则为0的html代码

<div id="countdown"></div>
<script>
function increment(){
  var countdown = document.getElementById("countdown");
  var currentValue = parseFloat(countdown.innerHTML);
  currentValue += 0.01;
  countdown.innerHTML = currentValue.toFixed(2);
}
setInterval(increment, 60000);
</script>