跟踪其他网站用户（分析）
我想知道是否有任何（合法）方法可以跟踪任何随机网站的网站分析。
我的意思很简单，有没有办法真正知道每个月有多少人进入谷歌？
我四处阅读，发现 Alexa 通过用户的工具栏和一些 cookie 推断出用户的数据，我对此不感兴趣，我的意思是真实的测量。
如果你想写这样的东西，你必须从哪里开始？
我想这是不可能的，但我无法真正理解为什么，是否有任何非法方法可以做到这一点？
I was wondering if there was any (legal) way to track websites analytics of any random site.
What I mean is simple, is there a way to actually know how many people enter Google a month?
I read around and found that Alexa extrapolates data from users with their toolbar and some cookies, im not interested in that, I mean a true measurement.
Where would you have to start if you wanted to write something like this?
I guess this is no possible but I can´t really understand why, are there any illegal ways of doing this?
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不，没有办法做到这一点。这就是 Alexa 需要依赖外推法的原因。
您必须依赖网站告诉您的信息。
一些商业网站使用尼尔森等服务来保留“官方”访问者数量，并以此为基础计算广告价格，但这不是规则。
Nope, there is no way to do that. That's why Alexa needs to rely on extrapolation.
You'll have to rely on what the sites tell you.
Some commercial sites use services like Nielsen that keep an "official" visitor count on whose basis advertising prices are calculated, but this is not the rule.