好的，你应该看看 chrome.browserAction.setIcon 文档 。
$ b

Well, you should take a look at the chrome.browserAction.setIcon documentation.

整数（可选） tabId

限制选择特定选项卡时的更改。当标签关闭时自动重置。

Limits the change to when a particular tab is selected. Automatically resets when the tab is closed.

正是需要的！现在，标签ID是在发件人$ c $中报告的
$ b

Just what was needed! Now, the tab ID is reported in the sender parameter:

chrome.runtime.onMessage.addListener(
  function(request, sender, sendResponse) {
    if( request.message === "Existing" ) {
        chrome.browserAction.setIcon({
            path:"OKicon.png",
            tabId: sender.tab.id
        });
    }

    if( request.message === "Not Existing" ) {
        chrome.browserAction.setIcon({
            path:"NOKicon.png",
            tabId: sender.tab.id
        });
    }
  }
);