函数返回异步响应 [英] Function return async response

问题描述

喜欢一个人在这里问（但他的解决方案，调用诺特尔功能） http://stackoverflow.com/a/10796326 / 315200 ......我想知道，如果它可能有不调用第二个函数的异步请求响应功能，而只是返回当异步请求响应。

Like a person asked here (but his solutions as to call a nother function) http://stackoverflow.com/a/10796326/315200 ...I would like to know if its possible to have a function which doesn't call a second function on response of an async request, but simply return when the async request responses.

事情是这样的，也许：

function callToFacebook() {
    var fbResponse;

    FB.api('/me', function (response) {
        fbResponse = response;
    });

    return fbResponse; //Will return undefined because CallToFacebook is async
}

这不是可能的一些方法，而不调用另一个函数??

Isn't that possible some way, without calling another function??

我试图做到的，是有一个功能，我可以用一些参数调用，这将返回响应对象从异步Web服务，像FB。

What I'm trying to achieve is to have one function I can call with some parameters, which will return the response object from a async webservice, like FB.

推荐答案

总之，没有。你不能有一个异步函数返回一个有意义的值同步，因为该值不当时存在（因为它是异步内置在背景中）。

In short, no. You cannot have an asynchronous function return a meaningful value synchronously, because that value does not exist at that time (as it is built asynchronously in the background).

您可以，但是，返回无极的对象，再presenting在潜在回报价值的异步操作，并绑定一个函数，该对象使用做（）

You can, however, return a Promise object, representing the "potential return value" of the asynchronous operation, and bind a function to that object using done() or similar. That way, your function gets return semantics (instead of having to chain the control flow into a callback), and remains asynchronous.

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