问我如何知道哪些AJAX请求正在等待？

EN

    public void WaitForAjax(IWebDriver driver)
    {
        const int ajaxSleepInMilliseconds = 250;
        int counter = 0;
        const int maxSleeps = 40;
        while (counter < maxSleeps)
        {
            var javaScriptExecutor = driver as IJavaScriptExecutor;
            var ajaxIsComplete = javaScriptExecutor != null &&
                                 (bool) javaScriptExecutor.ExecuteScript("return jQuery.active == 0");
            if (ajaxIsComplete)
            {
                break;
            }
            Thread.Sleep(ajaxSleepInMilliseconds);
            counter += 1;
        }
        if (counter >= maxSleeps)
        {
            var currentAjaxCalls = ""; // ???
            throw new WebDriverException("Maximum number of WaitForAjax Thread.Sleeps were hit. Waited for AJAX " +
                "for: " + ((maxSleeps * ajaxSleepInMilliseconds) / 60) + " seconds; the calls in progress were: " +
                currentAjaxCalls);
        }
    }