什么是Facebook的功能__d [英] What is Facebook's function __d

问题描述

我正在开发一个项目（希望）涉及利用已经内置到Facebook中的一些javascript。但是我马上遇到了障碍，我无法弄清楚 __ d 是什么。

I'm working on a project that (hopefully) involves taking advantage of some of the javascript that's already built into Facebook. But right away I've got a roadblock in that I can't figure out what __d is.

如果你看一下源javascript文件，几乎每个命令都以 __ d

If you look at the source javascript files, pretty much every command begins with __d

开头例如：

__d("legacy:live-timer",["LiveTimer"],function(a,b,c,d){a.LiveTimer=b('LiveTimer');},3);

但我找不到任何javascript文件中的任何内容 __ d 确实如此。是不是必须在某处定义所有这些其他功能才能利用它？

But I can't find anywhere in any of the javascript files what __d actually does. Shouldn't it have to be defined somewhere for all these other functions to take advantage of it?

更新：

所以，假设有一个网站上有这样的javascript ...

So let's say there's a site with some javascript like this...

function alertSomething(var) {
    if (var) alert("Here it is: "+var);
}

if (some condition) alertSomething("something");

现在假设我有一个Chrome扩展程序，我可以将自己的Javascript注入页面。不能\我的Chrome扩展Javascript有这样的东西......

Now let's say I had a Chrome Extension and I was able to inject my own Javascript into the page. Couldn't \my Chrome Extension Javascript have something like this...

if (some other condition) alertSomething("something else");

因此，我会利用页面上已存在的javascript中的一些代码？

Thus I would be taking advantage of some code that exists in the javascript already on the page?

推荐答案

我在<$ c $的第20行找到 __ d 的定义C> 1LWPxIBQ4v0.js 。不知道文件是否为每个人命名相同。搜索 a .__ d = function（s，t，u，v）（ a 是全局对象，即窗口，有效地使 __ d 全局函数）。尽管如此，祝你好运......

I found the definition of __d on line 20 of 1LWPxIBQ4v0.js. No idea if the file is named the same for everyone. Search for "a.__d=function(s,t,u,v)" (a is the global object, i.e. window, effectively making __d a global function). Good luck with that de-minification though...

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