有没有一种简单的方法来检测是否XMLHtt prequest是活跃在浏览器窗口？或者，有多少是活跃的？ IE浏览器。有没有一种方法来检测是否有任何的AJAX在浏览器窗口中把活动？

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?

扩展的问题：使用JavaScript是有办法，我可以看到，如果任何XMLHtt prequests是开放的？如window.XMLisActive（）或类似的东西？

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：最后写一个包装XMLHtt prequest https://gist.github.com/1820380

Solution: Ended up writing a wrapper for XMLHttpRequest https://gist.github.com/1820380

推荐答案

有没有一种方法来检测从JS打开的连接，除非你写一个包装 XmlHtt prequest （或猴子补丁吧），其跟踪打开的连接。

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.

下面是kidcapital的猴子补丁，不知道它是完美的，但它是一个良好的开端

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);
    }
  })();