使用Javascript - 等待一些异步回调的回归？ [英] Javascript - waiting for a number of asynchronous callbacks to return?

问题描述

什么是用于处理多个异步回调的最佳方法/库？现在，我有这样的事情：

What's the best way/library for handling multiple asynchronous callbacks? Right now, I have something like this:

_.each(stuff, function(thing){
   async(thing, callback);
});

我需要执行一些code中的回调已经在的东西被解雇的每个元素后。

什么是做最彻底的方法？我打开使用库。

What's the cleanest way to do this? I'm open to using libraries.

推荐答案

有一个名为 Async.js 大图书馆帮助解决许多异步和放像这样的问题;流量控制助手。它提供了多种功能的forEach，可以帮助你在一个数组/对象中的每个项目上运行的回调。

There is a great library called Async.js that helps solve problems like this with many async & flow control helpers. It provides several forEach functions that can help you run callbacks for every item in a an array/object.

退房日期：
https://github.com/caolan/async#forEach

// will print 1,2,3,4,5,6,7,all done

var arr = [1,2,3,4,5,6,7];

function doSomething(item, done) {
  setTimeout(function() {
    console.log(item);
    done(); // call this when you're done with whatever you're doing
  }, 50);
}

async.forEach(arr, doSomething, function(err) {
    console.log("all done");
});

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