异步等待功能 [英] Async wait for a function

问题描述

我正在尝试发送短信以获取功能.但是问题是:该功能大约需要10到15秒才能完成(因为我们使用PhantomJS做了很多工作).

I'm trying to send an SMS for a function. But the problem is: The function takes about 10-15 seconds to finish (Since we do bunch of stuff with PhantomJS).

_.each(users, function(userData){ // This does not work since i need to wait for 15 seconds
  smsFree.sendSMSFree(userData, productUrl);
});

我什至尝试使用setTimeout，但效果也不尽人意.

I've even tried using setTimeout but that didn't quite work as well.

我正在使用NodeJS.如何利用Async或其他库解决问题?

I'm on NodeJS. How can I leverage Async or some other library to solve my problem?

我想等待15秒，然后循环到第二个对象.不确定如何实现. (是Async.serial吗?)

I want to wait for 15 seconds then loop to the second object. Not sure how this is achieved. (Async.serial?)

• R

推荐答案

您应使用 承诺模式 和Q 一起使用.您的函数应该返回一个 promise ，事情将会变得更加简单:

You should use promise pattern with Q. Your function should return a promise and things will be easier:

Q.all(users.map(user => smsFree.sendSMSFree(userData, productUrl)))
       .then(() => {
           // Do stuff once every SMS has been successfully sent!
       }); 

或标准Promise:

Promise.all(users.map(user => smsFree.sendSMSFree(userData, productUrl)))
       .then(() => {
           // Do stuff once every SMS has been successfully sent!
       }); 

如果您的函数不使用 promise模式，则可以将其包装起来以使用整个模式，否则您将陷入实现异步延续的困境...

If your function doesn't use promise pattern you can either wrap it to use the whole pattern or you'll be stuck in terms of implement asynchronous continuations...

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