搞清楚是在不回调的一个XMLHtt prequest请求时是在、回调、prequest、XMLHtt
我想超载XMLHtt prequest。*在JavaScript的方法，这样的网页可以计算出，如果一个Ajax请求发生，而无需使用任何侵入性回调。现在，像这样使用大多数JS框架时，工作比较细的：
I'm trying to overload the XMLHttpRequest.* method in JavaScript so a webpage can figure out if an Ajax request took place without using any intrusive callbacks. Now, something like this works relatively fine when using most JS frameworks:
XMLHttpRequest.prototype.getResponseHeader = function() {
alert('O hai, looks like you made an AJAX request.');
}
然而，有两个渔获：
However, there are two catches:
getResponseHeader不能用作 getResponseHeader 的了。 ，它不会在简单的AJAX例子工作。即 xmlhttp.open（GET，simple.html，假）;
getResponseHeader can't be used as getResponseHeader anymore.
It doesn't work in simple AJAX examples. i.e. xmlhttp.open("GET","simple.html",false);
有什么办法JS可以镜像 XMLHtt prequest.open（）或任何方式，我可以链接的东西吧。我已经尝试了百万范式（工厂，克隆，包装 - 大多数导致无限递归）并没有什么似乎工作。也许这只是不可能的。任何想法？
Is there any way JS can mirror XMLHttpRequest.open() or any way that I can chain something to it. I've tried a million paradigms (factory, cloning, wrapping -- most resulting in infinite recursion) and nothing seems to be working. Maybe it's just impossible. Any ideas?
推荐答案
您可以保留参照原有的一些变量，你覆盖的方法，然后打电话给你覆盖了函数内的变量之前：
You can keep a reference to the original in some variable before you override the method and then call that variable within the function you overrode:
var temp = XMLHttpRequest.getResponseHeader;
XMLHttpRequest.getResponseHeader = function() { temp.apply(this, arguments); };
这应该让你跟踪使用不带覆盖了原有的功能所提供的功能。
That should let you track uses without overriding the functionality provided by the original function.
