用按钮在歌曲之间交换

Question

我正试图通过点击按钮来交换2首歌曲。我可以通过更改src成功交换歌曲，但是当我使用和if else声明控件“闪烁”时，这意味着我必须在if else语句中有一个bug。

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（比如"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，您只需要用完整路径替换测试，例如：

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

实时片段（工作HTML，但没有实际声音）：

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>