Microsoft Edge popup扩展如何获取后台页面？(Microsoft Edge popup extension how to get backgroundpage?)

 我正在尝试在Microsoft Edge上使用我的Chrome扩展程序来调整它，但我无法构建弹出窗口，因为在我的弹出窗口的脚本中，某些变量似乎不存在： 
 
var bg = chrome.extension.getBackgroundPage();
 
 这行不起作用，它应该访问内容脚本的数据。 我发现有些人说必须使用browser.extension.getBackgroundPage（）替换它，但它不起作用。 
 
 我该怎么替换这条线？ 

I am trying to use my Chrome extension on Microsoft Edge to adapt it, but I can't build the popup because in the script of my popup, some variables seem to not exist:
 
var bg = chrome.extension.getBackgroundPage();
 
This line isn't working, it supposed to access data of content scripts. I've found some guys saying browser.extension.getBackgroundPage() must be used to replace it, but it doesn't work to.
 
By what should I replace this line?