微信开发 html 苹果播放不了声音怎么解决

<audio autoplay src="" id="leadership"></audio>  
<script type="text/javascript">  
        //背景音乐听功能  
        function playMusic() {  
            var m_val = '{$model.music}';  
            document.getElementById('leadership').value = m_val;  
            $("#leadership").attr("src", m_val);  
            }  
</script>  

<img onclick="playMusic()" src="/{$Think.Theme_Path}common/Image/ting.png" width="80"height="70" />