skip audio intro

a helper for skiping audio intro
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// ==UserScript==
// @name        skip audio intro
// @name:zh-CN  音频片头和片尾跳过
// @namespace   https://github.com/22earth
// @description a helper for skiping audio intro
// @description:zh-cn 跳过音频片头和片尾
// @author      22earth
// @include     https://www.ximalaya.com/*
// @version     0.0.1
// @grant       GM_registerMenuCommand
// @grant       GM_setValue
// @grant       GM_getValue
// @run-at      document-start
// @license     MIT
// ==/UserScript==


const SKIP_START_CONFIG = 'e_user_skip_start_config';
const SKIP_END_CONFIG = 'e_user_skip_end_config';
function setStart() {
    var start = +prompt('设置跳过片头秒数', '20');
    skipStartSec = start;
    GM_setValue(SKIP_START_CONFIG, start);
}
function setEnd() {
    var sec = +prompt('设置跳过片尾秒数', '10');
    skipEndSec = +sec;
    GM_setValue(SKIP_END_CONFIG, sec);
}
if (GM_registerMenuCommand) {
    GM_registerMenuCommand('设置跳过片头秒数', setStart);
    GM_registerMenuCommand('设置跳过片尾秒数', setEnd);
}
let skipStartSec = GM_getValue(SKIP_START_CONFIG, 20);
let skipEndSec = GM_getValue(SKIP_END_CONFIG, 10);
function setAudioEvents(audio) {
    audio.addEventListener('canplaythrough', function () {
        if (this.currentTime < skipStartSec) {
            this.currentTime = skipStartSec;
        }
    });
    audio.addEventListener('timeupdate', function () {
        if (this.currentTime >= this.duration) {
            return;
        }
        if (this.currentTime + skipEndSec > this.duration) {
            this.currentTime = this.duration;
        }
    });
}
(function (window) {
    function hookAudioContructor() {
        var fakeObj = new Proxy(window.Audio, {
            get: function (target, p) {
                return Reflect.get(target, p);
            },
            construct(target, args) {
                let inst = new target(...args);
                setAudioEvents(inst);
                return inst;
            },
        });
        return fakeObj;
    }
    function setDescriptor(fakeObj, prop) {
        Object.defineProperty(window, prop, {
            get: function () {
                return fakeObj;
            },
            set: function (v) {
                console.log(`检测到修改 ${prop}`);
            },
        });
    }
    setDescriptor(hookAudioContructor(), 'Audio');
})(unsafeWindow);