如何异步方式调用10个函数并收集所有结果并知道什么时候完成？ [英] How to async way call 10 functions and collect all results and know when all are finished?

问题描述

我正在使用Node.js的延迟模块，我创建了从远程服务器获取数据的延迟函数。我需要从不同的远程服务器获取10个文件，如何做到这一点，承诺知道什么时候完成并获取所有然后结果数组？
目前我已经关闭了，只有当我完成之前的操作时我才会获取下一个文件，但它同步且速度慢。

I am using deferred module for Node.js and I have created deferred functions which fetch data from distant server. I need to fetch 10 files from different distant server, how to do this with promise to know when all are finished and fetch all then results in array ? At the moment I have closure and I am fetching next file only when I have done with previous but it is sync and slow.

推荐答案

根据我所假设的文档是你正在使用的模块，你可以这样做：

According to the documentation of what I assume is the module you're using, you can do this:

deferred(delayedAdd(2, 3), delayedAdd(3, 5), delayedAdd(1, 7))(function (result) {`
    console.log(result); // [5, 8, 8]`
});

例如：

deferred(promise1, promise2, promise3)(function (result) {
    // `result` is an array of the results
});

在上面的链接中，搜索分组承诺（尽管它没有多少以上）。

On the link above, search for "Grouping Promises" (although it doesn't have much more than the above).

如果您有一系列承诺，可以使用 函数#apply 执行上述操作：

If you have an array of promises, you can use Function#apply to do the above:

deferred.apply(undefined, theArray)(function (result) {
    // `result` is an array of the results
});

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