将数据从DOM传递到本机消息传递API(Pass data from DOM to native messaging API)

 我正在开发一个Chrome扩展程序，它通过Chrome的本机消息传递API将当前标签的URL发送到后台脚本。 这将启动一个外部脚本，该脚本运行youtube-dl以提取视频URL并将其传递给在该平台上具有硬件加速的播放器。 这有效，代码在这里： https ： //github.com/mad-ady/odroid.c2.video.helper 。 
 
 我想通过以下方式改进它： 
 
 
 
 在每个视频元素之后在DOM中注入新按钮 
 
 
 按下按钮，提取视频元素的src URL，并通过消息传递API将其传递给后端进行播放 
 
 
 我的问题是“这是允许/可能的”吗？ 
 当我在页面的范围内时，如何调用后台定义的函数？ 

I'm working on a chrome extension that sends the URL of the current tab to a background script via Chrome's native messaging API. This starts an external script which runs youtube-dl to extract the video url and pass it to a player that has hardware acceleration on that platform. This works and the code is here: https://github.com/mad-ady/odroid.c2.video.helper.
 
I'd like to improve it with the following:
 
 
 
inject new buttons in the DOM after each video element
 
 
on button press extract the video element's src URL and pass it via the messaging API to the backend for playback
 
 
My question is "is this allowed/possible"?
 How can I call a function defined in background when I'm in the page's scope?

原文：https://stackoverflow.com/questions/39933888