开关状态正常。在MusicAudio AddEventListener Ended上，无论音乐何时结束，它都不会选择随机歌曲。如果我刷新页面，它将进入无限循环。

HTML

<audio id="main-audio" src=""></audio>

JavaScript

let musicIndex = 1;
repeatBtn.addEventListener('click', (e) => {
const getClass = repeatBtn.className;
switch(getClass){
    case "fas fa-redo":
        repeatBtn.className = "fas fa-random";
        repeatBtn.setAttribute("title", "Playlist Shuffle")
    break;
        break;
    case "fas fa-random":
        repeatBtn.className = "fas fa-stop-circle";
        repeatBtn.setAttribute("title", "Song Repeat")
    break;
    case "fas fa-stop-circle":
    repeatBtn.className = "fas fa-redo";
    repeatBtn.setAttribute("title", "Song Looped")
    break;
}
})

musicAudio.addEventListener('ended', () => {

const getClass = repeatBtn.className;
switch(getClass){
    case "fas fa-random":
        let randIndex = Math.floor(Math.random() * allMusic.length) + 1;
        do{
            Math.floor(Math.random() * allMusic.length) + 1;
        }while(musicIndex = randIndex);
        const test = musicIndex = randIndex;
        loadMusic(musicIndex);
        playMusic();
        break;
    case "fas fa-stop-circle":
        musicAudio.currentTime = 0;
        loadMusic(indexNumb)
        break;
    case "fas fa-redo":
        nextMusic()
        break;
}
})

顺晟科技：

您的条件当前是赋值，而不是比较。

你写道：

<代码>//..While（音乐指数=随机指数）；// ...

应该是：

<代码>//..While（音乐索引==随机索引）；// ...

请参阅JavaScript