GET http：// localhost：8000 / album / songs / undefined

Question

请帮助解决这个问题，我只是尝试使用HTML5媒体播放器，直到现在我尝试从源文件夹中拉出音乐并且在此处显示此错误时，它一直平稳而稳定安慰。我正在使用UCBrowser。

var b = document.documentElement;
var tracks;
b.setAttribute('data-useragent', navigator.userAgent);
b.setAttribute('data-platform', navigator.platform);


// HTML5 audio player + playlist controls...
// Inspiration: http://jonhall.info/how_to/create_a_playlist_for_html5_audio
// Mythium Archive: https://archive.org/details/mythium/

$(document).ready(function(){

    $.ajax({
        type: "get",
        url: "{!! URL::to('playSongs') !!}",
        success: function(data){
            tracks = data;
            actionAudio();
        }
    });

function actionAudio(){
jQuery(function ($) {
    var canvas, ctx, grd, source, context, analyser, fbc_array, bars, bar_x, bar_width, bar_height;
    var supportsAudio = !!document.createElement('audio').canPlayType;
    if (supportsAudio) {
        var index = 0,
            playing = false,
           // mediaPath = '//archive.org/download/mythium/',
            mediaPath = '/album/songs/',
            extension = '',
            trackCount = tracks.length,
            npAction = $('#npAction'),
            npTitle = $('#npTitle'),
            audio = $('#audio1').bind('play', function () {
                playing = true;
                npAction.text('Now Playing...');
            }).bind('pause', function () {
                playing = false;
                npAction.text('Paused...');
            }).bind('ended', function () {
                npAction.text('Paused...');
                if ((index + 1) < trackCount) {
                    index++;
                    loadTrack(index);
                    audio.play();
                } else {
                    audio.pause();
                    index = 0;
                    loadTrack(index);
                }
            }).get(0),
            btnPrev = $('#btnPrev').click(function () {
                if ((index - 1) > -1) {
                    index--;
                    loadTrack(index);
                    if (playing) {
                        audio.play();
                    }
                } else {
                    audio.pause();
                    index = 0;
                    loadTrack(index);
                }
            }),
            btnNext = $('#btnNext').click(function () {
                if ((index + 1) < trackCount) {
                    index++;
                    loadTrack(index);
                    if (playing) {
                        audio.play();
                    }
                } else {
                    audio.pause();
                    index = 0;
                    loadTrack(index);
                }
            }),
            li = $('#plList li').click(function () {
                var id = parseInt($(this).index());
                if (id !== index) {
                    playTrack(id);
                }
            }),
            loadTrack = function (id) {
                $('.plSel').removeClass('plSel');
                $('#plList li:eq(' + id + ')').addClass('plSel');
                npTitle.text(tracks[id].name);
                index = id;
                audio.src = mediaPath + tracks[id].file; // + extension;
            },
            playTrack = function (id) {
                loadTrack(id);
                audio.play();
            };
        //extension = audio.canPlayType('audio/mpeg') ? '.mp3' : audio.canPlayType('audio/ogg') ? '.ogg' : '';
        loadTrack(index);
        window.addEventListener("load", initMP3Player(audio), false);
        audio.crossOrigin = "anonymous";
    }
});
}
});

控制台出错：

GET http://localhost:8000/album/songs/undefined

我不知道为什么会在网址上附加未定义的原因。普通网址应为http://localhost:8000/album/songs/song_name.mp3