可以同步（阻塞）Ajax调用块浏览器的用户界面？ [英] can a synchronous (blocking) ajax call block the browser's UI?

问题描述

这个问题是jQuery的导向，但不一定完全。

This question is jQuery oriented, but not necessarily exclusively.

简短的问题：

可以同步Ajax调用块从一个普通按钮被点击的？我testings表明它不会发生，但也许另一个浏览器发出的问题。

Can synchronous ajax call block a normal button from being clicked on? My testings show it doesn't happen, but maybe another browser makes problems.

长问题：

在另外一个问题我问过，的如何阻止对AJAX调用（我想它阻止），男生们说，浏览器会在某些情况下阻止。

In another question I've asked, how to block on ajax call (I want it to block), the guys said that the browser will block in some cases.

其实连文档的jQuery的说： 请注意，同步请求可能会暂时锁定浏览器，禁用任何行动，同时请求被激活。

Actually even the docs of jQuery say: Note that synchronous requests may temporarily lock the browser, disabling any actions while the request is active.

我想：
1。了解如何/为什么这会发生。
2。评估这种可能性发生。

I'm trying to:
1. Understand how/why that would happen.
2. Assess the probability of that to happen.

这是我的理解，这可能是不正确的：
我想，锁定将发生在页面的UI，如果我作为dev的，没有建立/更新AJAX调用本身，它的块的JavaScript虚拟机前的用户界面，从而延缓了用户界面生成/更新。正确与否？

From my understanding, which might be incorrect:
I imagine that "locking" will happen to the page's UI if I, as the dev, didn't build/update the UI before the ajax call itself, which "blocks" the javascript VM, thus delaying the UI build/update. Correct or not?

推荐答案

是的，它会的。虽然同步请求未完成，浏览器等待其返回。这种情况发生的概​​率是100％，但如果你的要求返回速度不够快，这可能不是那么明显。事情是，你不能要求返回快速计数。

Yes it will. While a synchronous request is outstanding, the browser waits for it to return. The probability of that happening is 100%, but if your request returns fast enough, it might not be that noticeable. Thing is, you can't count on a request returning quickly.

这就是AJAX调用点。第一个 的意思是异步的，这意味着，不堵。

That's the point of ajax calls. The first a mean asynchronous, which means, "doesn't block".

因为Ajax调用是异步的，你的code可以在任何地方时请求返回，这意味着你需要一种方法来处理时，该请求并返回响应。这就是为什么你使用的回调的处理响应。

Since ajax calls are asynchronous, your code can be anywhere when the request returns, which means you need a way to handle the response when the request does return. That is why you use callbacks to handle the response.

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