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Editorial Team
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Asked: 2026-06-11T15:26:08+00:00

I’m having a hard time understanding the logic behind the setTimer method in javascript.

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I’m having a hard time understanding the logic behind the setTimer method in javascript.

 <html><head>
    <script>
        function Timer () {
        var today = new Date();
        var h = today.getHours();
        var m = today.getMinutes();
        var s = today.getSeconds();

    document.getElementById('show').innerHTML=h+":"+m+":"+s;
        t = setTimeout("Timer()", 1000); 
      }
</script>
</head>

<body onload="Timer()">
<div id="show"></div>
</body></html>

setTimeout is used to delay a function/method execution. Then why it is being used in a real-time clock? 

t = setTimeout("Timer()", 1000);

This part is confusing.

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1 Answer

  1. Editorial Team

    When the Timer() function is called, it schedules itself to be run again one second later. The end result is once every second, Timer() updates the show element with the current time. (I have no idea why it’s assigned to t, unless t is used in some other code on the page.)

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