<script src="https://code.jquery.com/jquery-1.9.1.min.js"></script>  <audio id="hello" autoplay="true" controls="controls"></audio>

  <script type="text/javascript">

    var audio = document.getElementById('hello');

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    audio.src = 'http://dict.youdao.com/dictvoice?audio=hello&type=1';

​

    setTimeout(function(){

        $('#hello').attr('src', 'http://dict.youdao.com/dictvoice?audio=world&type=1');

    }, 3000);

  </script>

​