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js-event-loop
/
fea3.html

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

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

<body>

</body>

<script>
    setTimeout(() => {
        console.log("here is timeout-1");//2
        new Promise((resolve, reject) => {
            console.log("promise");//3
            resolve()
        }).then(() => console.log("promise.then"));//4
    }, 0);

    setTimeout(() => {
        console.log("here is timeout-2");//5
    }, 0);

    console.log("start!");//1
</script>


</html>