浏览器的 AJAX (XmlHttpRequest) 超时长度

问题描述

我一直在网上搜索，试图找到一个直接的答案.有谁知道浏览器 ajax 请求的默认超时长度?如果它改变了，也按版本?

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

我认为浏览器没有AJAX超时，只有同步或异步请求；同步 - 首先冻结 JavaScript 执行，直到请求返回，异步 - 不冻结 JavaScript 执行，它只是将请求从执行流程中取出，如果您有回调函数，它将与正在运行的脚本并行执行该函数(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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