<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>setInterval counter</title>
</head>
<body>
<h1 id="timer"></h1>
<button type="button" onclick="startInterval();">Start interval</button>
<script type="text/javascript">
"use strict"
let n=60; // in seconds
let i;
function startInterval(){
i=setInterval(()=>{
document.getElementById("timer").innerHTML=n;
if(n==0){
clearInterval(i);
// switch state for states
}
n=n-1;
},100);
}
</script>
</body>
</html>
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Javascript setInterval counter example
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