加入在JavaScript 2“主题” [英] Join 2 'threads' in javascript

问题描述

如果我有一个Ajax调用关取（有回调），然后其他一些code运行在此期间。我怎样才能有第三个功能，当第一2的完成，将调用。我敢肯定，它很容易与轮询（setTimeout和再检查一些变量），但我宁愿一个回调。

If I have an ajax call off fetching (with a callback) and then some other code running in the meantime. How can I have a third function that will be called when both of the first 2 are done. I'm sure it is easy with polling (setTimeout and then check some variables) but I'd rather a callback.

这可能吗？

推荐答案

您可以只给出相同的回调到这两个AJAX调用，并在此期间，你的另一code运行时，使用一个变量来跟踪他们的联合进步，然后将它们链接到一个回调象下面这样：

You could just give the same callback to both your AJAX call and your other code running in the meantime, use a variable to track their combined progress, then link them to a callback like below:

// Each time you start a call, increment this by one
var counter = 0;

var callback = function() {
    counter--;
    if (counter == 0) {
        // Execute code you wanted to do once both threads are finished.
    }
}

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