tabs.getCurrent() 结果未定义?

问题描述

不确定为什么当我导航到 amazon.com 或 google.com 并点击浏览器图标进行浏览器操作时，我无法使用 getCurrent() 检索有关当前选项卡的信息.关于我缺少什么的任何提示?

Not sure why I cannot retrieve info about current tab using getCurrent() when I navigate to, say, amazon.com or google.com and hit the browser icon for a browser action. Any hints on what I am missing?

清单:

{
  "name": "testGetCurrentTab",
  "version":  "1.0",
  "description":  "",
  "manifest_version": 2,

  "icons": {
    "48": "icons/icon-48.png"
  },

  "permissions": [
      "tabs",
      "<all_urls>"
  ],

  "browser_action": {
      "default_icon": "icon/icon-32.png"
  },

  "background": {
      "scripts": ["background.js"]
  }      
}

背景:

function displayInfo() {

  function onGot(tabInfo) {
    console.log('Inside onGot() ...');
    console.log(tabInfo);
  }

  function onError(error) {
    console.log(`Error: ${error}`);
  }

  var gettingCurrent = browser.tabs.getCurrent();
  gettingCurrent.then(onGot, onError);
}

browser.browserAction.onClicked.addListener(displayInfo);

这是输出:

Inside onGot() ...  background.js:4:7

undefined  background.js:5:7

Firefox 开发版 54(64 位)

Firefox Dev Edition 54 (64bit)

https://developer.mozilla.org/zh-CN/Add-ons/WebExtensions/API/tabs/getCurrent

推荐答案

来自 MDN tabs.getCurrent():

From MDN tabs.getCurrent():

获取 tabs.Tab 包含有关运行此脚本的选项卡的信息.

Get a tabs.Tab containing information about the tab that this script is running in.

您可以在有浏览器选项卡的上下文中调用此函数，例如 选项页面.如果您从后台脚本或弹出窗口调用它，它将返回 undefined.

You can call this function in contexts where there is a browser tab, such as an options page. If you call it from a background script or a popup, it will return undefined.

browserAction.onClicked 事件返回活动选项卡，您不需要其他 API 调用.

The browserAction.onClicked event returns the active tab, you do not need another API call.

browser.browserAction.onClicked.addListener(function(tab) {
 console.log(tab)
})

查看 标签browserAction.onClicked listener的code>参数.

See the tab parameter for browserAction.onClicked listener.

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