Saratov64,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script>
window.addEventListener("DOMContentLoaded", function() {
var btn = document.querySelector("#btn");
btn.addEventListener("click", function() {
clearInterval(timer)
});
function allstation() {
document.querySelector("#main").innerHTML += "test "
}
var timeInterval = 1E3;
var timer = setInterval(allstation, timeInterval)
});
</script>
</script>
</head>
<body>
<div id="main"></div>
<input id="btn" name="" type="button" value="stop">
</body>
</html>