问题描述

有没有一种简单的方法可以检测 XMLHttpRequest 在浏览器窗口中是否处于活动状态?或者有多少是活跃的?IE.有没有办法检测我的浏览器窗口中是否有任何 AJAX 调用处于活动状态?

Is there an easy way to detect if an XMLHttpRequest is active in the browser window? Or how many are active? ie. Is there a way to detect if there are any AJAX calls active in my browser window?

问题扩展: 使用 javascript 有没有办法可以查看是否打开了任何 XMLHttpRequests?比如window.XMLisActive()"之类的?

Extension of question: Using javascript is there a way I can see if any XMLHttpRequests are open? Such as "window.XMLisActive()" or something like that?

解决方案:最终为 XMLHttpRequest 编写了一个包装器:gist here

Solution: Ended up writing a wrapper for XMLHttpRequest: gist here

推荐答案

除非您为 XmlHttpRequest 编写一个包装器(或对其进行猴子补丁)，否则无法检测来自 JS 的打开连接跟踪打开的连接.

There is not a way to detect an open connection from JS unless you write a wrapper for XmlHttpRequest (or monkey patch it) that keeps track of opened connections.

这里是kidcapital的猴子补丁，不确定是否完美，但这是一个好的开始

Here's kidcapital's monkey patch, not sure if it's perfect, but it's a good start

  (function() {
    var oldOpen = XMLHttpRequest.prototype.open;
    window.openHTTPs = 0;
    XMLHttpRequest.prototype.open = function(method, url, async, user, pass) {
      window.openHTTPs++;
      this.addEventListener("readystatechange", function() {
          if(this.readyState == 4) {
            window.openHTTPs--;
          }
        }, false);
      oldOpen.call(this, method, url, async, user, pass);
    }
  })();

注意

这不处理 fetch 或 websockets，但你可以在这些情况下做类似的事情.

This does not handle fetch or websockets but you could do something similar in those cases.

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