chrome extension content script, 只能访问 dom, 不能访问页面 js 变量和函数 Injected Script, 被插入到页面里的 js 代码 chrome://extensions puzzle button: chrome extension 图标后面的拼图按钮 develop chrome extension doc https://developer.chrome.com/docs/extensions/mv3/ javascript web api: https://developer.mozilla.org/en-US/docs/Web/API chrome api: https://developer.mozilla.org/en-US/docs/Web/API html: https://web.dev/learn/html/ css: https://web.dev/learn/css/ javascript: https://developer.mozilla.org/en-US/docs/Learn/JavaScript chrome extension development overview: