我有一个在 DOM 中注入的脚本，我想在后台向我的服务工作者发送消息。我收到错误，但我不明白为什么。

这是我的 background.js 文件：

chrome.runtime.onMessage.addListener((req, sender, sendRes) => {
  console.log('this has worked', req, sender, sendRes('this worked'));
  return true;
});

这是我的 inject.js 文件，它注入了 injected.js （见下文）代码：

const s = document.createElement('script');
s.src = chrome.runtime.getURL('injected.js');
s.onload = function () {
  this.remove();
};
(document.head || document.documentElement).appendChild(s);

injected.js ：

console.log('fetch interceptor started');
const { fetch: origFetch } = window;
chrome.runtime.sendMessage({ works: 'This worked at least' }, (res) => console.log(res)); // Error is thrown immediately
window.fetch = async (...args) => {
  const response = await origFetch(...args);

  const url = new URL(args[0].url);
  //   sendMessageToBackground({ pathname, ...url.searchParams }); // not in use because it throws error at the top already
  response
    .clone()
    .json()
    .then(async (body) => await sendMessageToBackground({ pathname, body }))
    .catch((err) => console.error(err));

  return response;
};

async function sendMessageToBackground(msg) {
  const res = await chrome.runtime.sendMessage(msg);
  console.log('result message', res);
  console.log('msg', msg);
}

manifest.json （如果需要）：

{
...
"permissions": ["storage", "activeTab", "scripting", "webRequest"],
  "host_permissions": ["https://REDACTED.com/*"],
  "manifest_version": 3,
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": ["https://REDACTED.com/*"],
      "run_at": "document_start",
      "js": ["inject.js"]
    }
  ],
  "web_accessible_resources": [{ "resources": ["injected.js"], "matches": ["https://REDACTED.com/*"] }],
...
}