ios_audio_autoplay.js

function audioAutoPlay(id){  
    var audio = document.getElementById(id),  
        play = function(){  
            audio.play();  
            document.removeEventListener("touchstart",play, false);  
        };  
        audio.play();  
        document.addEventListener("WeixinJSBridgeReady", function () {  
            play();  
        }, false);  
        document.addEventListener('YixinJSBridgeReady', function() {  
            play();  
        }, false);  
        document.addEventListener("touchstart",play, false);  
    }