javascript - 通过按钮在歌曲之间切换

Question

我正在尝试通过单击按钮在两首歌曲之间交换。我只需更改 src 就可以成功地交换歌曲一次，但是当我使用 if else 语句时，控件会“闪烁”，这意味着我的 if else 语句中一定有错误。

HTML

<div id = "audioplayer">
    <p id="songname">Listen to  Sisyphus by Have A Nice Life</p>
    <audio id = "song"
        controls
        src="Untitled/10%20Sisyphus.mp3">
        Your browser does not support the
        <code>audio</code> element.
    </audio>
</div>

<button onclick="myFunction()">Click to change songs</button>

JS:

function myFunction() {
    if(document.getElementById("song").src === "Untitled/10%20Sisyphus.mp3") {

        document.getElementById("songname").innerHTML = "listening to track03.mp3";
        document.getElementById("song").src = "test.mp3";
    }

    else{

    document.getElementById("songname").innerHTML = "Listen to Sisyphus by Have A Nice Life";
    document.getElementById("song").src = "Untitled/10%20Sisyphus.mp3";



    }
}

Answer 1

虽然您可以使用相对路径设置.src(例如“Untitled/10%20Sisyphus.mp”)，但访问.src 属性将为您提供完整路径:

const song = document.getElementById("song");
song.src = "test.mp3";
console.log(song.src);

<audio id="song" controls src="Untitled/10%20Sisyphus.mp3"></audio>

因此，您只需将测试替换为完整路径即可，例如:

function myFunction() {
  if (document.getElementById("song").src === "https://example.com/Untitled/10%20Sisyphus.mp3") {
    // ...

实时片段(有效的 HTML，但没有实际的声音):

function myFunction() {
  const song = document.getElementById("song");
  const songname = document.getElementById("songname");
  if (song.src === "https://stacksnippets.net/Untitled/10%20Sisyphus.mp3") {
    songname.innerHTML = "listening to track03.mp3";
    song.src = "test.mp3";
  } else {
    songname.innerHTML = "Listen to Sisyphus by Have A Nice Life";
    song.src = "Untitled/10%20Sisyphus.mp3";
  }
}

<div id="audioplayer">
  <p id="songname">Listen to Sisyphus by Have A Nice Life</p>
  <audio id="song" controls src="Untitled/10%20Sisyphus.mp3">
                Your browser does not support the
                <code>audio</code> element.
            </audio>
</div>

<button onclick="myFunction()">Click to change songs</button>