use alt= to scroll down, alt- to scroll up(both can be faster by pressing more), and alt+0 to stop.
// ==UserScript==
// @name Auto scroller
// @namespace https://greasyfork.org/zh-TW/users/11333-bendwarn
// @version 0.1
// @description use alt= to scroll down, alt- to scroll up(both can be faster by pressing more), and alt+0 to stop.
// @author bendwarn
// @match *://*/*
// @run-at document-idle
// @license MIT License
// ==/UserScript==
let intervalid = null
let time = 16
let speed = 0
let move = _ => {document.body.scrollTop += speed}
document.body.onkeydown = e => {
if (e.altKey) {
let key = e.key
if (key == '+' || key == '=' || key == '-') {
speed += (key == '-') ? -2 : 2
if (intervalid === null) intervalid = setInterval(move, time)
else {
clearInterval(intervalid)
if (speed) intervalid = setInterval(move, time)
else intervalid = null
}
} else if (key == '0') {
clearInterval(intervalid)
intervalid = null
speed = 0
}
}
}