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test_demo
/
2、promise.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html>
<script type="module">
    let promise = new Promise(function (resolve, reject) {
        // 同步操作 最先出来
        console.log('Promise');
        resolve('我是异步回调的数据');
    });

    promise.then((value) => {
        console.log(value);
    });

    console.log('Hi!');
</script>