JavaScript的：重写XMLHtt prequest.open（） [英] Javascript: Overriding XMLHttpRequest.open()

问题描述

我

如何将能够覆盖 XMLHtt prequest.open（）方法，然后抓住并改变它的参数？

我已经试过了代理方法，但它没有工作，虽然除去开过摆脱当 XMLHtt prequest（）被称为：

 （函数（）{
    VAR代理= window.XMLHtt prequest.open;
    window.XMLHtt prequest.open =功能（）{
        $（'登录'）HTML（参数[0]）;
        返回proxied.apply（这一点，参数）;
    };
}）（）;
 

解决方案

您不能修改继承了打开方法 XMLHtt prequest对象只是添加一个方法到 XMLHtt prequest构造这实际上是从来没有使用过。

我想这code在Facebook和我能赶上要求：

 （函数（）{
    VAR代理= window.XMLHtt prequest.prototype.open;
    window.XMLHtt prequest.prototype.open =功能（）{
        执行console.log（参数）;
        返回proxied.apply（这一点，[] .slice.call（参数））;
    };
}）（）;

/ *
    [POST，/ajax/chat/buddy_list.php?__a=1，真]
    [POST，/ajax/apps/usage_update.php?__a=1，真]
    [POST，/ajax/chat/buddy_list.php?__a=1，真]
    [POST，/ajax/canvas_ticker.php?__a=1，真]
    [POST，/ajax/canvas_ticker.php?__a=1，真]
    [POST，/ajax/chat/buddy_list.php?__a=1，真]
* /
 

所以是开放的方法需要被添加到 XMLHtt prequest原型（window.XMLHtt prequest.prototype）没有 XMLHtt prequest构造（window.XMLHtt prequest）

How would I be able to override the XMLHttpRequest.open() method and then catch and alter it's arguments?

I've already tried the proxy method but it didn't work, although removing the open over-rid when XMLHttpRequest() was called:

(function() {
    var proxied = window.XMLHttpRequest.open;
    window.XMLHttpRequest.open = function() {
        $('.log').html(arguments[0]);
        return proxied.apply(this, arguments);
    };
})();

解决方案

You are not modifying the open method inherited by XMLHttpRequest objects but just adding a method to the XMLHttpRequest constructor which is actually never used.

I tried this code in facebook and I was able to catch the requests:

(function() {
    var proxied = window.XMLHttpRequest.prototype.open;
    window.XMLHttpRequest.prototype.open = function() {
        console.log( arguments );
        return proxied.apply(this, [].slice.call(arguments));
    };
})();

/*
    ["POST", "/ajax/chat/buddy_list.php?__a=1", true]
    ["POST", "/ajax/apps/usage_update.php?__a=1", true]
    ["POST", "/ajax/chat/buddy_list.php?__a=1", true]
    ["POST", "/ajax/canvas_ticker.php?__a=1", true]
    ["POST", "/ajax/canvas_ticker.php?__a=1", true]
    ["POST", "/ajax/chat/buddy_list.php?__a=1", true]
*/

So yeah the open method needs to be added to XMLHttpRequest prototype (window.XMLHttpRequest.prototype) not XMLHttpRequest constructor (window.XMLHttpRequest)

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