☰

Auto scroller

use alt= to scroll down, alt- to scroll up(both can be faster by pressing more), and alt+0 to stop.

  1. // ==UserScript==
  2. // @name         Auto scroller
  3. // @namespace    https://greasyfork.org/zh-TW/users/11333-bendwarn
  4. // @version      0.1
  5. // @description  use alt= to scroll down, alt- to scroll up(both can be faster by pressing more), and alt+0 to stop.
  6. // @author       bendwarn
  7. // @match        *://*/*
  8. // @run-at       document-idle
  9. // @license      MIT License
  10. // ==/UserScript==
  11. let intervalid = null
  12. let time = 16
  13. let speed = 0
  14. let move = _ => {document.body.scrollTop += speed}
  15. document.body.onkeydown = e => {
  16.   if (e.altKey) {
  17.     let key = e.key
  18.     if (key == '+' || key == '=' || key == '-') {
  19.       speed += (key == '-') ? -2 : 2
  20.       if (intervalid === null) intervalid = setInterval(move, time)
  21.       else {
  22.         clearInterval(intervalid)
  23.         if (speed) intervalid = setInterval(move, time)
  24.         else intervalid = null
  25.       }
  26.     } else if (key == '0') {
  27.       clearInterval(intervalid)
  28.       intervalid = null
  29.       speed = 0
  30.     }
  31.   }
  32. }