我尝试按照此处的文档将变量从后台脚本传递到内容脚本。

http://code.google.com/chrome/extensions/messaging.html

清单：

{
  "name": "name",
  "description": "desc",
  "version": "1.0",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [ "http://*/*", "https://*/*" ],
      "js": ["content.js"]
    }
  ],
  "background": {
    "scripts": ["background.js"]
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
      ],
  "options_page": "options.html",
  "browser_action":
  {
    "default_icon": "icon.png",
    "default_title": "Settings",
    "default_popup": "settingspanel.html"
   }
 }

background.js 文件：

chrome.extension.onConnect.addListener(function(port) {
  port.onMessage.addListener(function(msg) {
    port.postMessage({counter: msg.counter+1});
  });
});

content.js

chrome.extension.onRequest.addListener(
  function(request, sender, sendResponse) {
    sendResponse({counter: request.counter+1});
  });

我在后台脚本上收到一条错误消息，提示“无法读取未定义的属性‘onConnect’”