招聘&找人帮忙改脚本，有偿。20r。新人

就改滑动条。只在一个网页上修改就行（到时候给你说哪个网站），修改网页里面的滑动条，而不是网页滑动条！！！

// ==UserScript==
// @name autoScroll
// @namespace eyes
// @version 1.3.0
// @description It allows the page to scroll on its own
// @author eyes
// @match :///*
// @grant none
// ==/UserScript==

(function() {
'use strict';
let speed = 0;
// 获取滑动位置
let getScrollTop = () => {
var scrollTop = 0,
bodyScrollTop = 0,
documentScrollTop = 0;
if (document.body) {
bodyScrollTop = document.body.scrollTop;
}
if (document.documentElement) {
documentScrollTop = document.documentElement.scrollTop;
}
scrollTop = (bodyScrollTop - documentScrollTop > 0) ? bodyScrollTop : documentScrollTop;
return scrollTop;
}

    //浏览器视口的高度
    let getWindowHeight = () => {
        var windowHeight = 0;
        if (document.compatMode == 'CSS1Compat') {
            windowHeight = document.documentElement.clientHeight;
        } else {
            windowHeight = document.body.clientHeight;
        }
        return windowHeight;
    }

    //文档的总高度
    let getScrollHeight = () => {
        var scrollHeight = 0,
            bodyScrollHeight = 0,
            documentScrollHeight = 0;
        if (document.body) {
            bodyScrollHeight = document.body.scrollHeight;
        }
        if (document.documentElement) {
            documentScrollHeight = document.documentElement.scrollHeight;
        }
        scrollHeight = (bodyScrollHeight - documentScrollHeight > 0) ? bodyScrollHeight : documentScrollHeight;
        return scrollHeight;
    }

    // 滚动事件
    setInterval(() => {
        // 判断页面是否滑到底部
        let bottomFlag = (getScrollTop() + getWindowHeight() == getScrollHeight()) ? true : false;
        let topFlag = (getScrollTop() == 0) ? true : false;
        if (bottomFlag || topFlag) {
            speed = 0;
        } else {
            document.documentElement.scrollTop += speed;
        }
    }, 5)

    // 判断是否需要滚动
    document.onkeydown = (e) => {
        e = event || window.event;
        // 同时按上键与alt键向上滚动
        if (e && e.keyCode == 38 && e.altKey) { 
            let bottomFlag = (getScrollTop() + getWindowHeight() == getScrollHeight()) ? true : false;
            if (bottomFlag) {
                document.documentElement.scrollTop += -1;
            }
            speed -= 1.5;
        }
        // 同时按下键与alt键向下滚动
        if (e && e.keyCode == 40 && e.altKey) { 
            let topFlag = (getScrollTop() == 0) ? true : false;
            if (topFlag) {
                document.documentElement.scrollTop += 1;
            }
            speed += 1.5;
        }
        // 同时按 CTRL + ALT 键停止滚动
        if (e && e.altKey && e.ctrlKey) {
            speed = 0;
        }
    }

    // 单击页面停止滚动
    document.onclick = () => {
        speed = 0;
    }

    // 滑动滚轮页面停止滚动
    document.onmousewheel = () => {
        speed = 0;
    }
    document.addEventListener("DOMMouseScroll", () => {
        speed = 0;
    })

})();