解决办法是，加载页面就给添加一次点击事件

<audio id="audioDom" src="error.mp3" onclick="playAudio()" preload></audio>

var audioDom= docoment.getElementByld("audioDom");

audioDom.onclick = function(e){}

//微信浏览器内部初始化完成后

document.addEventListener("WeixinJSBridgeReady", function () {

      audioDom.load();

}, false);

//监听点击事件

window.addEventListener('click', playAudio, false);

function playAudio(obj) {

      audioDom.play();

}