$.when 是否以与数组中相同的顺序解析延迟数组？

Question

我有一个数组，其中包含未知数量的延迟，我正尝试使用 $.when 来解决这些问题。当所有的 deferreds 都被解析后，'.then' 函数会按照我在数组中输入 then 的相同顺序返回已解析的 deferreds 吗？

伪代码示例：

var deferreds = [];
for(0,1,2,...,x) { 
   var def = JsonRpc(...);
   deferreds.push(def);
}
$.when.apply($, deferreds).then(function () {
  console.log(arguments.length); //outputs a number >= 0
  for(0,1,2,...,x) {
     console.log("Defered: ", arguments[0,1,2,...,x])
  }
});

deferreds[0] 是否等于 arguments[0]，deferreds[x] 是否等于 arguments[x]？

提前感谢所有回复！ //埃德文

Answer 1

根据文档：

The arguments passed to the doneCallbacks provide the resolved values for each of the Deferreds, and matches the order the Deferreds were passed to jQuery.when(). For example:

var d1 = $.Deferred();
var d2 = $.Deferred();

$.when( d1, d2 ).done(function ( v1, v2 ) {
    console.log( v1 ); // "Fish"
    console.log( v2 ); // "Pizza"
});

d1.resolve( "Fish" );
d2.resolve( "Pizza" );

一个小例子：

var deferreds = [];
for (var i = 0; i < 3; i++) {
  var def = $.Deferred();
  deferreds.push(def);
}

$.when.apply($, deferreds).then(function() {
  console.log(arguments.length); //outputs a number >= 0
  for (var i = 0; i < 3; i++) {
    console.log("Defered: ", arguments[i]);
  }
});

deferreds[1].resolve("Fish2");
deferreds[2].resolve("Fish3");
deferreds[0].resolve("Fish1");

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Answer 2

每个 question/statement 一次拿一个 ...

Does $.when resolve array of deferreds in the same order as they were in the array?

没有。 $.when() 不解析传递给它的 deferreds/promises。它聚合 deferreds/promises，其中每一个都通过其他方式解决（解决或拒绝）。这里，"aggregate" 表示接受一组承诺，return 表示接受一个承诺。

I have an array of an unknown number of deferreds that I'm trying to resolve with $.when.

同样，$.when() 没有解析传递给它的 deferreds/promises。

When all the deferreds have been resolved, will the '.then' function give me back the resolved deferreds in the same order as I entered then in the array?

不，.then() 不会退回延期、已解决或其他情况。但是，是的，它的成功回调函数的参数（如果它触发）将与原始数组一致。

Will deferreds[0] be equal to arguments[0] and deferreds[x] be equal to arguments[x]?

不，它们不会相等，但它们会对应，逐个索引。每个参数将是原始数组中相应的deferred/promise传递的结果。

$.when 是否以与数组中相同的顺序解析延迟数组？

Does $.when resolve array of deferreds in the same order as they were in the array?

jquery

json-rpc

jquery-deferred