Live Demo: JavaScript Execute a Function at Regular Intervals

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>JavaScript Execute a Function at Regular Intervals</title>
</head>
<body>
    <script>
    function showTime() {
        let d = new Date();
        document.getElementById("clock").innerHTML = d.toLocaleTimeString();
    }
    setInterval(showTime, 1000);
    </script>
     
    <p>The current time on your computer is: <span id="clock"></span></p>
</body>
</html>