如何通过 JavaScript 访问 HTTP 请求标头字段?
我想在客户端 JavaScript 中捕获 HTTP 请求标头字段，主要是 Referer 和 User-Agent.我如何访问它们?
I want to capture the HTTP request header fields, primarily the Referer and User-Agent, within my client-side JavaScript. How may I access them?
Google Analytics 设法通过 JavaScript 获取您嵌入页面中的数据，因此这绝对是可能的.
Google Analytics manages to get the data via JavaScript that they have you embed in you pages, so it is definitely possible.
如果你想访问referrer和user-agent，客户端Javascript可以使用它们，但不能直接访问headers.
If you want to access referrer and user-agent, those are available to client-side Javascript, but not by accessing the headers directly.
要检索引用者，请使用 document.referrer代码>.
要访问用户代理，请使用 navigator.userAgent.
To retrieve the referrer, use document.referrer.
To access the user-agent, use navigator.userAgent.
正如其他人所指出的，HTTP 标头不可用，但您特别询问了通过 Javascript 提供的引用器和用户代理.
As others have indicated, the HTTP headers are not available, but you specifically asked about the referer and user-agent, which are available via Javascript.