javascript - `canplay` HTML5 音频事件未触发

Question

我正在尝试确定 HTML5 音频元素何时准备好开始播放，以便通知用户。我正在使用以下代码:

<script type="text/javascript">
    var audio = document.getElementById("audio")
</script>

<audio id="audio" hidden loop>
<source src="/static/music/music.mp3" type="audio/mpeg">
<source src="/static/music/music.ogg" type="audio/ogg">
<source src="/static/music/music.wav" type="audio/wav">
No support for HTML5 audio!
</audio>

<div id="playButton" onclick="audio.play();audio.addEventListener('canplay',function() {
    alert("ready!");
});">PLAY</div>

但是，即使在按下播放按钮之后，警告也不会出现。我使用最新的 Chrome (Chrome 40)

Answer 1

您甚至在 JavaScript 找到它之前就已经获取了元素!所以你根本收不到音频。

试试这个:

<audio id="audio" hidden loop>
<source src="music.mp3" type="audio/mpeg">
No support for HTML5 audio!
</audio>

<div id="playButton" onclick="play()">PLAY</div>
<script type="text/javascript">
    var audio = document.getElementById("audio");

    // Binding event
    audio.oncanplay = function() {
        alert("Can start playing video");
    };

    // Playing the audio
    function play() {
        audio.play();
    }
</script>