index.html

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

<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>

<body>

</body>
<script src="./lib/promise.js"></script>
<script>
    var pm = new PromiseAplus((resolve, reject) => {
        setTimeout(() => {
            resolve('pass');
        }, 1000);
    }).then((value) => {
        console.log(value);
        return new Promise((resolve) => {
            setTimeout(() => {
                resolve(value + 1);
            }, 1000);
        })
    }).then((value) => {
        console.log(value);
        return value
    }).then((value) => {
        console.log(value);
        return new PromiseAplus((resolve) => {
            setTimeout(() => {
                resolve(value + 1);
            }, 2000);
        })
    }).then((value) => {
        console.log(value);
    });

</script>

</html>