Concept : setInterval and clearInterval
setInterval sets up a recurring timer. It returns a handle that you can pass into clearInterval to stop it from firing.
<!DOCTYPE html>
<html>
<body>
<p>A script on this page starts this clock:</p>
<p id="demo"></p>
<button onclick="myStopFunction()">Stop time</button>
<script>
var myVar = setInterval(myTimer, 1000);
function myTimer() {
var d = new Date();
var t = d.toLocaleTimeString();
document.getElementById("demo").innerHTML = t;
}
function myStopFunction() {
clearInterval(myVar);
}
</script>
</body>
</html>
Usescases:
Examples :
Usecase: Check if delivery call is not firing before user accept cookie?
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