浏览器扩展通信问题为什么只有特定页面可行，其它页面报错（Could not establish connection. Receiving end does not exist）？-灵析社区

> * 写了个网页音乐播放器扩展，本意是想不需要切换到音乐网页去点击切换歌曲，希望扩展在任意网页点击可切换该音乐网页的歌曲。 > * 现在遇到的问题是，扩展在在那个音乐网页就可以正常使用（=.=），在其它网页都报错：Unchecked runtime.lastError: > Could not establish connection. Receiving end does not exist. > manifest.json { "name": "播放器", "version": "0.0.0.1", "manifest_version": 3, "description": "用于切换播放模式及控制下一首歌曲的扩展程序", "icons": { "128": "icons/128x128.png" }, "action": { "default_popup": "popup/popup.html" }, "content_scripts": [{ "matches": ["音乐播放网页"], "js": ["lib/jquery.min.js", "content-scripts/content.js"] }], "externally_connectable": { "ids": ["ebjnejafkk*********plickhfn"], "matches": ["音乐播放网页"] }, "permissions": [ "tabs", "scripting" ], "web_accessible_resources": [{ "resources": ["images/*.jpeg"], "matches": [""] }] } content.js //向扩展（popup.js）发送消息 chrome.runtime.sendMessage() // 接收来自扩展(popup.js)的消息 chrome.runtime.onMessage.addListener() popup.js //向content.js（即音乐网页）发送消息 chrome.tabs.sendMessage() //接收来自content.js（即音乐网页）的消息 chrome.runtime.onMessage.addListener