Ajax调用不应该等待响应

Question

我在经典asp应用程序中使用ajax调用来执行存储过程。
但是我不想等到存储过程运行(存储过程大约需要5-10分钟才能完成)。
Ajax必须调用存储过程并且需要立即返回。
我希望Ajax调用不应该等待响应。

下面是我的代码片段:

1)  $.ajax({  
  type: "POST",  
  url: "runstoredprocedure.asp",  
});    
2)  setInterval(function(){  jQuery("#list").trigger("reloadGrid"); },10000);  

这是我正在使用的两个ajax调用。第一个大约运行5-7分钟。第二个直到第一个完成后才发射。但立即我需要调用第二个ajax调用。

在这个问题上有谁能帮我吗?

Answer 1

javascript将请求作为另一个线程的一部分触发，ajax调用之后的任何代码将立即执行。说到这里，关于JS的一个误解是async:

People take for granted that because it’s asynchronous, it’s a thread. They are partially right. There must be a thread created by the browser to keep the javascript running while it makes a request to the server. It’s internal and you don’t have access to that thread. But, the callback function called when the server responds to the ajax request is not in a thread.
I’ll explain clearer. If javascript runs some code that takes 5 seconds to execute and an ajax response arrives at 2 seconds, it will take 3 seconds before it will be executed (before the callback function is called). That’s because javascript itself doesn’t create a thread to execute the ajax response from the server and simply waits that all executions are terminated before starting a new one.
So if you’re running a lot of ajax requests simultaneously, you might get some weird behavior because they will all wait one on another before executing themselves.

最后一句话与你的原因有关。

摘自博客:http://www.javascriptkata.com/2007/06/04/ajax-and-javascript-dont-use-threads/

有趣的阅读:http://www.javascriptkata.com/2007/06/12/ajax-javascript-and-threads-the-final-truth/

Answer 2

AJAX默认是异步的(这是所有javascript库的默认选项)。例如，在jQuery中:

$.ajax({
  url: url,
  data: data,
  success: success,
  dataType: dataType
});

你有一个成功，它需要一个回调。当你的动作完成时，回调将被调用。jQuery将立即返回