javascript - 如何停止自动解决Promise对象？

考虑以下代码：

function foo() {
    return promiseFoo.then((res) => {
        //...
        //Construct a `promiseBar` object which is promise-like,
        //but also has other uses.
        //...
        return promiseBar;
    });
}

foo().then((res) => {
    //Because `promiseBar` is promise-like, it was automatically resolved.
    //So now, `res` is, for example, a primitive string instead of the
    //original `promiseBar` object
})

有什么方法可以防止自动解决承诺类对象？

最佳答案

您可以将其包装在容器对象中，然后通过解构将其打开：

function foo() {
    return promiseFoo.then((res) => {
        //...
        //Construct a `promiseBar` object which is promise-like,
        //but also has other uses.
        //...
        return [promiseBar];
    });
}

foo().then(([res]) => {
    //Because it is an array, promiseBar is not resolved here
});

公平地说，在使用诺言的几年中，我从来没有真正自己做过这个，所以我想知道您实际上在做什么-请分享。