AJAX（XmlHtt prequest）超时长度由浏览器 [英] AJAX (XmlHttpRequest) timeout length by browser

问题描述

我一直在网上淘试图找到一个直接的答案。有谁知道默认的超时长度由浏览器的AJAX请求吗？同一个版本，如果它的改变？

I've been scouring the web trying to find a straight answer to this. Does anyone know the default timeout lengths for ajax request by browser? Also by version if it's changed?

推荐答案

我不认为浏览器有一个超时AJAX，只有同步或异步请求;同步 - 首先冻结JavaScript执行，直至请求返回， 异步 - 不冻结JavaScript执行，它只是接受请求了执行流程，如果你有一个回调函数就会执行功能并行的运行脚本（类似于线程）

I don't think browsers have a timeout for AJAX, there is only synchronous or asynchronous requests; synchronous - first freezes the JavaScript execution until the request returns, asynchronous - does not freeze JavaScript execution, it simply takes the request out of the execution flow, and if you have a callback function it will execute the the function in parallel with the running scripts (similar to a thread)

**sync flow:**

running JS script
     |
    ajax
(wait for response)
     |
execute callback 
     |
running JS script




 **async flow:**

 running JS script
     |
    ajax  --------------------
     |                       |
 running JS script       execute callback

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