Chrome命令API

我已经从使用命令API的Chrome文档中加载了这个示例扩展。

宣言.json

{
"name": "Sample Extension Commands extension",
  "description": "Press Ctrl+Shift+F (Command+Shift+F on a Mac) to open the browser action popup, press Ctrl+Shift+Y to send an event (Command+Shift+Y on a Mac).",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "browser_action.html"
  },
  "commands": {
    "toggle-feature": {
      "suggested_key": { "default": "Ctrl+Shift+Y" },
      "description": "Send a 'toggle-feature' event to the extension"
    },
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      }
    }
  }
}

背景.js

chrome.commands.onCommand.addListener(function(command) {
  console.log('onCommand event received for message: ', command);
});

非常简单,但侦听器回调没有被触发——我在控制台中没有得到任何输出,也没有任何错误。如果我使用其他API,例如选项卡,我的侦听器会被触发,这只是命令API对我不起作用。