如何在所有javascript ES6 Promise解决后运行 [英] How to run after all javascript ES6 Promises are resolved

问题描述

我正在替换一些使用jQuery Deferred对象的旧代码，我正在使用Bluebird / ES6 Promises进行重写。

I'm in the process of replacing some old code that used jQuery Deferred objects and I am rewriting using Bluebird/ES6 Promises.

如果我有多个异步调用，如何解决所有承诺后触发函数。

If I have multiple asynchronous calls, how can I trigger a function after all the promises are resolved.

使用jQuery Deferreds会是这样的：

Using jQuery Deferreds it would be something like this:

var requests = [...]; //some arbitrary data that is iterated to generate multiple ajax requests
var promises = [];
resuests.forEach(function(endpoint) {
    promises.push($.ajax({url: endpoint}));
});

$.when.apply($, promises).then(function() {
    alert('all promises complete!');
});

如何使用ES6 Promise语法重写此内容？

How do I rewrite this using ES6 Promise syntax?

推荐答案

由于这是标记的 bluebird 除了你已经获得的两个好的解决方案之外还有更蓝鸟的方式：

Since this is tagged bluebird in addition to the two good solutions you have already gotten here is a more "bluebird" way:

var requests = [...];

Promise.map(requests, $.get).then(function(results){
    alert('all promises complete!');
});

这可能很简单。

正如其他人所指出的那样，本机es6的方式是使用 Promise.all ，没有 Promise.resolve 或需要明确创建。本机承诺最干净的方式可能是：

As the others have pointed out, the native es6 way would be to use Promise.all, no Promise.resolve or explicit creation is needed. The cleanest way with native promises would probably be:

var requests = [...];
Promise.all(requests.map($.get)).then(function(results){

});

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