多次执行注入脚本
我已阅读文档并理解这是预期的：
脚本被注入到顶级页面和任何具有 HTML 源的子页面中，例如 iframe。不要假设每个浏览器选项卡只有一个脚本实例。
不过，我想知道：
- 除了 iframe 之外，还有哪些其他元素具有“HTML 源”（图像？对象？）？ “HTML 源代码”这个术语对我来说含糊不清，令人不安。
- 有没有办法检测哪个元素正在执行脚本？
按照建议，我已通过确定 window === window.top 过滤掉了 iframe，但其他元素仍在执行脚本，并且执行次数比我多很多想要。
谢谢。
I've read the documentation and understand that this is to be expected:
Scripts are injected into the top-level page and any children with HTML sources, such as iframes. Do not assume that there is only one instance of your script per browser tab.
I'm wondering, though:
- Other than iframes, what other elements have "HTML sources" (images? objects?)? The term "HTML sources" is uncomfortably vague to my ears.
- Is there any way to detect which element is executing the script?
I've filtered out iframes by determining that window === window.top, as recommended, but other elements are still executing the script and it's executing a lot more than I'd like.
Thanks.
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我回答自己的问题确实是我自己的错，因为我没有在问题中提供足够的信息。在我看来，我当时不知道我提供的信息太少了。
无论如何，在寻找解决方案的过程中，我在 Apple 的开发论坛上提出了一个问题< /a> 并包含以下关键信息：
document的beforeload事件上（或者应该发生）。我了解到的是
beforeload事件仅针对文档中的子资源触发。不适用于文档（或窗口）本身。我删除了事件处理程序并确保该脚本被应用为启动脚本（确实如此）。我已经将窗口作为顶部窗口进行了测试，所以我被覆盖了。现在我的注入脚本只触发一次。It's really my own fault that I'm answering my own question because I didn't really provide enough information in my question. In my defense, I didn't know at the time that I was providing too little information.
Anyway, while traveling down the road to a solution for this, I asked a question on Apple's dev forum and included the following bit of key info:
beforeloadevent of thedocument(or was supposed to).What I learned was that the
beforeloadevent only fires for subresources within the document. Not for the document (or window) itself. I removed the event handler and made sure that the script was applied as a start script (it was). I'd already applied the test for the window as top window so I was covered. Now my injection script only fires once.其他 HTML 源可能是框架或对象标签（带有 HTML 内容）。我不认为它可以是其他任何东西。然而，据我所知，它们也应该用
window === window.top过滤掉。尝试使用console.logdocument.location变量来查看哪个 URL 运行您注入的脚本，也许您可以找到加载它们的内容。Other HTML sources may be frames or object tags (with HTML contents). I don't think it can be anything else. However, to the extent of my knowledge, they should also be filtered off with
window === window.top. Tryconsole.loging thedocument.locationvariable to see which URL runs your injected script, and maybe you can find what loads them.