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<!DOCTYPE html>
<html>
<body>
​
<p>Click the button to wait 3 seconds, then alert "Hello".</p>
<p>After clicking away the alert box, an new alert box will appear in 3 seconds. This goes on forever...</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
var myVar;
​
function myFunction() {
  myVar = setInterval(alertFunc, 3000);
}
​
function alertFunc() {
  alert("Hello!");
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_win_setinterval1 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:04:11 GMT -->
</html>
​
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