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js-event-loop
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promise-2.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>
    async function test() {
        console.log('1');
        return '200';
    }
    let p = test();

    //以上代码等于
    // let p = new Promise((resolve, reject) => {
    //     console.log('1');
    //     resolve('200')
    // })

    console.log(p);
    p.then(res => {
        console.log(res);
    })
</script>

</html>