用两个参数异步JavaScript函数 [英] Two Async Javascript Functions with Parameters

问题描述

我的问题完全取决于previous <一个href=\"http://stackoverflow.com/questions/6392055/javascript-testing-two-asynch-calls-before-going-to-third-function\">question:

My question totally depends on a previous question:

关于方法3号（下称柜台一节）：如果 handleCompletion 从需要的值 startOtherAsync ，以完成其工作。我们怎样才能实现呢？

Regarding approach number 3 (the "counter" one): If handleCompletion needs a value from startOtherAsync in order to do its job. How can we implement that?

请注意，该值从 startOtherAsync （可能是一个参数）未来将 startAsync 伤心，无法调用 handleCompletion 了。

Note that that value coming from startOtherAsync (probably a parameter) will make startAsync sad and unable to call handleCompletion anymore.

推荐答案

这实际上是用承诺一个完美的地方。所有jQuery的Ajax调用默认情况下，这意味着回报的承诺，你可以简单地把它们连在一起：

This is actually a perfect place to use promises. All the jQuery Ajax calls return promises by default which means you can simply chain them together:

$.ajax({/*snip*/}).then(
   function(result){

      doSomethingWithResult(result);

      return $.ajax({/*snip*/});

   }).then(function(result){

      doSomeFinalProcessing(result);

   });

当然，一个的jsfiddle证明这一点发生。

下面是一个更新的提琴，说明如何多个同时承诺结合起来，并结合他们的结果。

Here is an updated fiddle that shows how to combine multiple simultaneous promises and combine their results.

http://jsfiddle.net/jwcarroll/U3N9u/

而code：

function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1) + min);
}

function doStuffLater(msg){
    var def = $.Deferred();

    setTimeout(function(){

        def.resolve(msg);

    }, getRandomInt(300, 1000));

    return def.promise();
}

function needsBothReturns(one, two){
    console.log({one:one, two:two});
}

var first = doStuffLater("Sent First");
var second = doStuffLater("Sent Second");

$.when(first, second).done(function(result1, result2){
    needsBothReturns(result1, result2);
});

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