案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<h3>演示如何创建 SOURCE 元素</h3>
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<p>点击按钮来创建两个 SOURCE 元素，并把它们添加到 AUDIO 元素。</p>
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​
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<audio controls id="myAudio" autoplay>
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Your browser does not support the audio tag.
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</audio><br>
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<p id="demo"></p>
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<button onclick="myFunction()">试一下</button>
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<script>
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function myFunction()
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{
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var x = document.createElement("SOURCE");
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x.setAttribute("src", "/img/horse.mp3");
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x.setAttribute("type", "audio/mpeg");
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document.getElementById("myAudio").appendChild(x);
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​
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var y = document.createElement("SOURCE");
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y.setAttribute("src", "/img/horse.ogg");
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y.setAttribute("type", "audio/ogg");
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document.getElementById("myAudio").appendChild(y);
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document.getElementById("demo").innerHTML = "音频播放器可以工作了，点击播放按钮会听到一段声音。";
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}
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</script>
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​
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</body>
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</html>
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