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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