问在Safari页面上播放背景音乐

EN

Undefined is not constructor(evaluating new audio())

var audio, playbtn, mutebtn, seek_bar;
function initAudioPlayer(){
    audio = new Audio();
    audio.src = "html/audio/di-evantile_behind-your-dream.mp3";
    audio.loop = true;
    audio.play();
    // Set object references
    playbtn = document.getElementById("playpausebtn");
    mutebtn = document.getElementById("mutebtn");
    // Add Event Handling
    playbtn.addEventListener("click",playPause);
    mutebtn.addEventListener("click", mute);

    // Functions
    function playPause(){
        if(audio.paused){
            audio.play();
            playbtn.style.background = "url(html/images/pause.png) no-repeat";
        } else {
            audio.pause();
            playbtn.style.background = "url(html/images/play.png) no-repeat";
        }
    }

    function mute(){
        if(audio.muted){
            audio.muted = false;
            mutebtn.style.background = "url(html/images/speaker.png) no-repeat";
        } else {
            audio.muted = true;
            mutebtn.style.background = "url(html/images/speaker_muted.png) no-repeat";
        }
    }
}

//play music on page load
window.addEventListener("load", initAudioPlayer);