如何从Chrome扩展程序访问本地存储？

Question

I have a web application that I'm writing a chrome extension for, and in this web application I save data to local storage. I am trying to access this data from a chrome extension, but none of these options are able to access the local storage that isn't associated with just the scope of the extension:

localStorage.getItem
localStorage["itemName"]
chrome.storage.local.get function
chrome.storage.sync.get function

None of these methods have worked, as they all return "null" or "undefined" for items that I know exist in the localStorage that have been set from my web application. Can someone please help? I thought this would be a simple task but so far I can't solve it.

Answer 1

正如Jaromanda X和wOxxOm所指出的那样，使用内容脚本为我提供了解决此问题所需的访问权限-谢谢！