<!DOCTYPE html>
<html lang="en-US">
<body>
<button onclick="myFunction()">Stop Count Down</button>
<p id="point"></p>
<script>
var count = 0;
var x = document.getElementById("point");
var myInterval = setInterval(myCountDown, 1000);
function myFunction(){
clearInterval(myInterval);
}
function myCountDown(){
count = count + 1;
x.innerHTML = count;
}
</script> </body>
</html>