Chrome tabs.onActivated.addListener会抛出一个“未定义”类型错误 [英] Chrome tabs.onActivated.addListener throws an "undefined" TypeError

问题描述

我正在做一个Chrome扩展程序，并在文档本声明关于 chrome.tabs.onActivated 。

I'm doing a chrome extension, and there is in the doc this statement about chrome.tabs.onActivated.

每当我尝试将 chrome.tabs.onActivated.addListener ，它表示未捕获的TypeError：无法调用未定义的方法'addListener'。

Whenever I try to place chrome.tabs.onActivated.addListener, it says Uncaught TypeError: Cannot call method 'addListener' of undefined.

整个background.html：

The whole background.html :

<script>
chrome.tabs.onActivated.addListener(function(info) {
    var tab = chrome.tabs.get(info.tabId, function(tab) {
        localStorage["current_url"] = tab.url;
    });
});
</script>

推荐答案

文档不完整 。从Chrome 18开始，将 chrome.tabs.onActiveChanged 替换为 chrome.tabs.onActivated 。在Chrome 17中， onActivated 事件不存在。

The documentation is incomplete. As of Chrome 18, chrome.tabs.onActiveChanged is replaced with chrome.tabs.onActivated. In Chrome 17, the onActivated event did not exist.

chrome.tabs.onActivated.addListener( function(info) {
    var tabId    = info.tabId,
        windowId = info.windowId;
});
chrome.tabs.onActiveChanged.addListener( function(tabId, info) {
    tabId        = tabId;         // For comparison
    var windowId = info.windowId;
});

我通过在扩展的上下文中打开控制台并检查 chrome.tabs 。

I obtained this function name by opening the console in the context of an extension, and inspecting the keys of chrome.tabs.

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