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<!DOCTYPE html> <html> <body> <h1>JavaScript Functions</h1> <h2>setInterval() with a Callback</h2> <p>Using setInterval() to display the time every second (1000 milliseconds).</p> <h1 id="demo"></h1> <script> setInterval(myFunction, 1000); function myFunction() { let d = new Date(); document.getElementById("demo").innerHTML= d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds(); } </script> </body> </html>
