Tạo javascript đếm ngược 10s, 30s, 90s

Code Html

<!DOCTYPE HTML>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
p {
  text-align: center;
  font-size: 60px;
  margin-top: 0px;
}
</style>
</head>
<body>

<p id="countdown"></p>

</body>
</html>

Code Javascripts

<script>
var timeleft = 100;
var downloadTimer = setInterval(function(){
  if(timeleft <= 0){
    clearInterval(downloadTimer);
    document.getElementById("countdown").innerHTML = "Finished";
  } else {
    document.getElementById("countdown").innerHTML = timeleft + " seconds remaining";
  }
  timeleft -= 1;
}, 1000);
</script>

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