iphone版微信不能自动播放音乐

wx.ready(function () {
    document.getElementById('myAudio').play();

    wx.onMenuShareAppMessage({
        title: 'XXX',
        desc: 'XXXX',
        link: linkUrl,
        imgUrl: imgUrl,
        type: 'link'
    });

在微信初始化加：document.getElementById('myAudio').play();