我想在本地存儲中存儲一組對象，但我只能將一個對象存儲到該數組中。所有新對象都會覆蓋索引 0 中的前一個對象。這是我的 JavaScript 代碼：class Track {    constructor (title, genre) {        this.title    = title;        this.genre    = genre;                this.id       = new Date().getTime();        this.creation = new Date();    }}class TrackList {    constructor () {        this.tracks = [];    }    newTrack(track) {        this.tracks.push(track);        this.saveLocalStorage();    }    saveLocalStorage() {        localStorage.setItem('tracks', JSON.stringify(this.tracks));    }}const addSongForm = document.querySelector('.addSongForm');addSongForm.addEventListener('submit', (e) => {    const songTitle = document.querySelector('.songTitle').value;    const songGenre = document.querySelector('.songGenre').value;    const newTrackForm = new Track(songTitle, songGenre);    const trackList = new TrackList();    trackList.newTrack(newTrackForm);});提前致謝??！