// ==UserScript==
// @name         视频助手
// @namespace    https://github.com/Aoerz/UserScripts
// @version      0.2
// @description  使用键盘控制视频播放
// @author       Aoerz
// @include      https://www.icourse163.org/*
// @include      https://www.xuetangx.com/*
// @include      https://www.coursera.org/*
// @include      https://www.bilibili.com/*
// @include      https://v.qq.com/*
// @include      https://www.iqiyi.com/*
// @include      https://v.youku.com/*
// @grant        none
// ==/UserScript==
(function() {
"use strict";
var skipTime = 10;
var skipVolume = 0.1;
var volumeTemp;
function xuetangxAssistant() {
document.onkeydown = function(e) {
var evt = e || window.event;
var v = document.querySelector("video");
event.preventDefault();
switch (evt.keyCode) {
case 90:
case 37: {
//left
if (v.currentTime < skipTime) {
v.currentTime = 0;
alert("已到达视频开头，无法快退");
}
console.log("快退" + skipTime + "s");
v.currentTime = v.currentTime - skipTime;
break;
}
case 88:
case 39: {
//right
if (v.currentTime > v.duration - skipTime) {
alert("已到达视频末尾，无法快进");
v.currentTime = v.duration;
}
console.log("快进" + skipTime + "s");
v.currentTime = v.currentTime + skipTime;
break;
}
case 68:
case 38: {
//up
if (v.volume > 1 - skipVolume) {
alert("到达最大音量");
v.volume = 1;
break;
}
console.log("音量放大" + skipVolume * 100 + "%");
v.volume = v.volume + 0.1;
break;
}
case 83:
case 40: {
//down
if (v.volume < skipVolume) {
alert("到达最小音量");
v.volume = 0;
break;
}
console.log("音量减小" + skipVolume * 100 + "%");
v.volume = v.volume - skipVolume;
break;
}
case 32: {
//pause
if (v.paused) {
console.log("播放");
v.play();
} else {
console.log("暂停");
v.pause();
}
break;
}
case 70: {
//fullscreen
if (!document.fullscreenElement) {
v.requestFullscreen();
} else {
if (document.exitFullscreen) {
document.exitFullscreen();
}
}
break;
}
case 77: {
//muse
if (v.volume === 0) {
v.volume = volumeTemp;
} else {
volumeTemp = v.volume;
v.volume = 0;
}
break;
}
case 36: {
//home
v.currentTime = 0;
break;
}
case 35: {
//end
v.currentTime = v.duration;
break;
}
}
};
}
xuetangxAssistant();
})();