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js-event-loop
/
callback2.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Event Loop</title>
</head>

<body>

</body>

<script>
    /*
    Hello
    Hi
    callback2
    callback1
    */
    console.log('Hello');
    setTimeout(() => console.log('callback1'), 1000);
    setTimeout(() => {
        let sum = 0;
        for (let i = 0; i < 10000_0000; i++) {
            sum += i;
        }
        console.log('callback2')
    }, 1000);
    console.log('Hi');
</script>


</html>