事件监听之后，暂停不了

Question

window.onload = function(){

var music = document.getElementById("music");

   var audio = document.getElementsByTagName("audio")[0];

      

      audio.addEventListener("ended",function(event){

      music.setAttribute("class","");

      },false);

      

          music.addEventListener("touchstart",function(event) {

if (audio.paused) {

audio.play();

this.setAttribute("class","play");

}else{

audio.pause();

this.setAttribute("class","");

};

},false);

};