如何向浏览器添加一个简单的脚本以始终在页面加载时运行？

Question

Say I had a piece of JavaScript that did something pretty simple, light DOM manipulation, perhaps. Is there a way I could add this to Chrome (or any browser) so that it'll run every time I hit a defined, public site that I don't own (eg stackoverflow.com)?

Answer 1

A userscript can do this for you. You'll need a userscript manager like Tampermonkey .

For example, the following userscript will log hi every time I visit example.com :

// ==UserScript==
// @name             My Userscript
// @description      <Put something here>
// @include          /^https://example\.com/
// @grant            none
// ==/UserScript==

console.log('hi');

DOM manipulation and pretty much logic you could think of and implement is possible too.