javascript - 有什么方法可以将 WinJS.Promise 转换为正常的 promise ？

Question

我正在 Visual Studio 2017 上制作 Windows 应用商店应用程序，我注意到默认情况下没有 new Promise()，只有 WinJS.Promise，它在某些方面与标准 promise 不同(例如，它没有 .catch，而不是 Promise.all，它有 Promise.join，等等)。

我想知道是否有一种简单的方法可以将 WinJS promise 转换为普通 promise 。

Answer 1

I was wondering if there's an easy way to convert WinJS promises into normal promises.

我已经在 UWP 中测试了正常的 promise，它在我这边有效。

function testPromise() {
    let thisPromiseCount = ++promiseCount;

    let log = document.getElementById('log');
    log.insertAdjacentHTML('beforeend', thisPromiseCount +
        ') Started (<small>Sync code started</small>)<br/>');

    // We make a new promise: we promise a numeric count of this promise, starting from 1 (after waiting 3s)
    let p1 = new Promise(
        // The resolver function is called with the ability to resolve or
        // reject the promise
        (resolve, reject) => {

            log.insertAdjacentHTML('beforeend', thisPromiseCount +
                ') Promise started (<small>Async code started</small>)<br/>');
            // This is only an example to create asynchronism
            window.setTimeout(
                function () {
                    // We fulfill the promise !
                    resolve(thisPromiseCount);
                }, Math.random() * 2000 + 1000);
        }
    );

    // We define what to do when the promise is resolved with the then() call,
    // and what to do when the promise is rejected with the catch() call
    p1.then(
        // Log the fulfillment value
        function (val) {
            log.insertAdjacentHTML('beforeend', val +
                ') Promise fulfilled (<small>Async code terminated</small>)<br/>');
        })
        .catch(
        // Log the rejection reason
        (reason) => {
            console.log('Handle rejected promise (' + reason + ') here.');
        });

    log.insertAdjacentHTML('beforeend', thisPromiseCount +
        ') Promise made (<small>Sync code terminated</small>)<br/>');
}

I'm making windows store apps on Visual Studio 2017 and I notice that by default there is no new Promise(), there is only WinJS.Promise.

我想您已经引用了 WinJS 库，因为涵盖了正常的 promise 。不过理论上，即使你引用了WinJS Libary，也不会影响正常的promise。请尝试在您的环境中运行。并让我知道结果。