使用 async.map 保留结果顺序

Question

我需要进行多个异步调用，并确保结果与调用保持相同的顺序。我如何使用 async 库实现这一点？

async.map(['item1', 'item2', 'item3'], function (itemName, callback){

    // Ajax GET item on server
    // ...

    // Once we have the item, return it
    callback(null, item);

}, function(error, results){

    // The results array is not necessarily sorted by order of calls
    // It can be [item2, item3, item1]

    // I want to ensure it will always be [item1, item2, item3]
});

Answer 1

The results array is not necessarily sorted by order of calls
It can be [item2, item3, item1]

嗯，没有。你为什么这么认为？ The docs 明确说明：

the results array will be in the same order as the original arr.

使用 async.map 保留结果顺序

Preserve order of results with async.map

javascript

asynchronous

callback

async.js