【工具】JS脚本｜网页任意视频倍速播放（包括MOOC、本地视频、其他的视频）

实际发布时间：2022-12-14 22:54:52。
csdn禁止浏览器脚本相关博客了，就只能重新发到这儿了。

只要浏览器播放视频时用的是<video>，而且当前页面只有这一个视频，就可以用这个脚本。

这是我很久以前为了倍速看MOOC视频，所以写的一个脚本，一直没有专门写博客去介绍它。刚刚，我想倍速看新闻联播，才发现忘记写博客了。

浏览器视频倍速播放的原理非常容易，我也是看了一下网页源代码才发现的。自从发现了这一点之后，我连本地视频都特别喜欢直接用浏览器播放。

脚本链接
脚本功能
脚本代码
脚本原理

脚本链接

Greasy Fork 链接：https://greasyfork.org/zh-CN/scripts/449828-任意视频倍速播放。

注：如果你的浏览器有可以运行 JS 脚本的扩展插件，那么点击即可安装。

脚本功能

PC端，任意浏览器视频倍速播放，按键调速。

其实除了倍速播放，还有调进度、调音量的功能。这是因为我觉得挺方便，就一块儿加上了。

① +/-0.25倍速：按w/s键；
② 切换整数倍速：按1/2/3/4键；
③ +/-0.5s：按→/←键；
④ +/-10%音量：按↑/↓键。

注：目前测试了mooc、新闻联播网站、本地视频，都可以，如果有不可以的网站请反馈给我。

注：用浏览器播放本地视频，需要将扩展插件设置为“允许访问文件URL”。

脚本代码

// ==UserScript==
// @name         任意视频倍速播放
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  任意浏览器视频倍速播放，按键调速。
// @author       shandianchengzi
// @include      *
// @icon         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
// @license      MIT
// @grant        none
// ==/UserScript==
 
 
//轻提醒
function Toast(msg, duration) {
    let p1 = new Promise((resolve,reject)=>{
        duration = isNaN(duration) ? 3000 : duration;
        var m = document.createElement('div');
        m.innerHTML = msg;
        m.style.cssText = "font-family:siyuan;max-width:60%;min-width: 150px;padding:0 14px;height: 40px;color: rgb(255, 255, 255);line-height: 40px;text-align: center;border-radius: 4px;position: fixed;top: 50%;left: 50%;transform: translate(-50%, -50%);z-index: 999999;background: rgba(0, 0, 0,.7);font-size: 16px;";
        document.body.appendChild(m);
        setTimeout(function() {
            var d = 0.5;
            m.style.webkitTransition = '-webkit-transform ' + d + 's ease-in, opacity ' + d + 's ease-in';
            m.style.opacity = '0';
            setTimeout(function() {
                document.body.removeChild(m)
            }, d * 1000);
        }, duration);
    });
}
 
async function mainFunc(){
    document.body.onkeydown = function(ev) {
        var e = ev || event;
        let video = document.getElementsByTagName('video')[0]
        console.log('test');
        if(video){
            switch(e.keyCode){
                case 87: //w键
                    video.playbackRate += 0.25;
                    Toast(video.playbackRate,100);
                    break;
                case 83: //s键
                    video.playbackRate -= 0.25
                    Toast(video.playbackRate,100);
                    break;
                case 39: //→
                    video.currentTime += 5;
                    break;
                case 37: //←
                    video.currentTime -= 5;
                    break;
                case 38: //↑
                    video.volume += 0.1;
                    Toast(video.volume,100);
                    break;
                case 40: //↓
                    video.volume -= 0.1;
                    Toast(video.volume,100);
                    break;
                case 49: //1
                    video.playbackRate = 1;
                    Toast(video.playbackRate,100);
                    break;
                case 50: //2
                    video.playbackRate = 2;
                    Toast(video.playbackRate,100);
                    break;
                case 51: //3
                    video.playbackRate = 3;
                    Toast(video.playbackRate,100);
                    break;
                case 52: //4
                    video.playbackRate = 4;
                    Toast(video.playbackRate,100);
                    break;
                default:
                    return e;
            }
        }
    }
}
 
(function() {
    'use strict';
    window.onhashchange=mainFunc;
    mainFunc();
    // Your code here...
})();

注意，如需修改脚本的快捷键，别用ASCII码表。
这个脚本的代码和按键的对应关系是用KeyCode码表，常用键码值如下图：