javascript - 如何更改内容

Answer 1

为您的标签分配 id

<i id="icon" class="material-icons">play_arrow</i>

然后更改标签的内部 HTML

if(aud1){
    document.getElementById("play1").addEventListener("click",
        function(){
            if(aud1.paused){
                aud1.play();
                document.getElementById("icon").innerHTML ="play_arrow";}
            else{
                aud1.pause();
                document.getElementById("icon").innerHTML ="pause";
            }
        );