leetcod AC music feedback

LeetCode AC play music 《Good luck》
当前为 2021-11-20 提交的版本，查看最新版本。
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// ==UserScript==
// @name         leetcod AC music feedback
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  LeetCode AC play music 《Good luck》
// @author       WangXiaowu
// @match        https://leetcode.com/*
// @icon         https://www.google.com/s2/favicons?domain=leetcode.com
// @require      http://code.jquery.com/jquery-latest.js
// @grant        none
// @license MIT
// ==/UserScript==

(function() {
    'use strict';
    let netease_src = "https://m704.music.126.net/20211120101235/597d909fe47e4e1336d43ea96eda127e/jdyyaac/obj/w5rDlsOJwrLDjj7CmsOj/8837130090/e64d/e6e0/76ad/4b9e06388e5bf007db0a99c0170a662c.m4a?authSecret=0000017d3b07043f05c80aaba3b00328";
    let qq_src = "https://dl.stream.qqmusic.qq.com/C400000491MM0CyBv8.m4a?guid=3154030324&vkey=3159164EDCFFAD356C35F3258E781F1FEEB4AB9F2E9A942787D6AA4BC686CE5E239F09722BB8992203AD3DE25D44A80791EB877E0866C1F8&uin=&fromtag=66";
    var player = document.createElement('audio');
    player.src = qq_src;
    var observer = new MutationObserver(function (mutations, me) {
        // `mutations` is an array of mutations that occurred
        // `me` is the MutationObserver instance
        var button =  $("a[data-question-title-slug]").length;
        if (button) {
            if(!player.paused || player.currentTime){
                player.pause();
            }else{
                player.play();
            }
            //me.disconnect(); // stop observing
            return;
        }
    });

    // start observing
    observer.observe(document, {
        childList: true,
        subtree: true
    });


    // Your code here...
})();