問題描述

有沒有一種簡單的方法可以檢測 XMLHttpRequest 在瀏覽器窗口中是否處于活動狀態?或者有多少是活躍的?IE.有沒有辦法檢測我的瀏覽器窗口中是否有任何 AJAX 調用處于活動狀態?

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?

問題擴展: 使用 javascript 有沒有辦法可以查看是否打開了任何 XMLHttpRequests?比如window.XMLisActive()"之類的?

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?

解決方案:最終為 XMLHttpRequest 編寫了一個包裝器:gist here

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

推薦答案

除非您為 XmlHttpRequest 編寫一個包裝器(或對其進行猴子補丁)，否則無法檢測來自 JS 的打開連接跟蹤打開的連接.

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.

這里是kidcapital的猴子補丁，不確定是否完美，但這是一個好的開始

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

這不處理 fetch 或 websockets，但你可以在這些情況下做類似的事情.

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

這篇關于如何檢查 HTTP 請求是否在瀏覽器中打開?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！