js0001

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<!DOCTYPE html>
<html>

<head>
    <title>A simple performance counter</title>
    <script>
        maxCount = 10000;
        console.time("My operation");
        for (var n = 0; n < maxCount; n++) {
            /*perform the operation to be measured*/ //#B
        }
        console.timeEnd("My operation");                    
    </script>
</head>

<body>
    Outputs to the console (press F12)
</body>

</html>