html5新标签Audio综合应用示例

2014-05-06 网页编程网 网页编程网

<!DOCTYPE html>
<html>
  <head>
    <title>HTML5 Audio Player </title>    
       
     
    <script type="text/javascript">
        // Global variable to track current file name.
        var currentFile = "";
        function playAudio() {
            // Check for audio element support.
            if (window.HTMLAudioElement) {
                try {
                    var oAudio = document.getElementById('myaudio');
                    var btn = document.getElementById('play'); 
                    var audioURL = document.getElementById('audiofile'); 
                    //Skip loading if current file hasn't changed.
                    if (audioURL.value !== currentFile) {
                        oAudio.src = audioURL.value;
                        currentFile = audioURL.value;                       
                    }
                    // Tests the paused attribute and set state. 
                    if (oAudio.paused) {
                        oAudio.play();
                        btn.textContent = "Pause";
                    }
                    else {
                        oAudio.pause();
                        btn.textContent = "Play";
                    }
                }
                catch (e) {
                    // Fail silently but show in F12 developer tools console
                     if(window.console && console.error("Error:" + e));
                }
            }
        }
             // Rewinds the audio file by 30 seconds.
        function rewindAudio() {
             // Check for audio element support.
            if (window.HTMLAudioElement) {
                try {
                    var oAudio = document.getElementById('myaudio');
                    oAudio.currentTime -= 30.0;
                }
                catch (e) {
                    // Fail silently but show in F12 developer tools console
                     if(window.console && console.error("Error:" + e));
                }
            }
        }
             // Fast forwards the audio file by 30 seconds.
        function forwardAudio() {
             // Check for audio element support.
            if (window.HTMLAudioElement) {
                try {
                    var oAudio = document.getElementById('myaudio');
                    oAudio.currentTime += 30.0;
                }
                catch (e) {
                    // Fail silently but show in F12 developer tools console
                     if(window.console && console.error("Error:" + e));
                }
            }
        }
             // Restart the audio file to the beginning.
        function restartAudio() {
             // Check for audio element support.
            if (window.HTMLAudioElement) {
                try {
                    var oAudio = document.getElementById('myaudio');
                    oAudio.currentTime = 0;
                }
                catch (e) {
                    // Fail silently but show in F12 developer tools console
                     if(window.console && console.error("Error:" + e));
               }
            }
        }
    </script>
  </head>
  <body>
    <p>
      <input type="text" id="audiofile" size="80" value="pinyin/a1.mp3" />
    </p>
    <audio id="myaudio" controls>
      HTML5 audio not supported
    </audio>
    <button id="play" onclick="playAudio();">
      Play
    </button>
    <button onclick="rewindAudio();">
      Rewind
    </button>
    <button onclick="forwardAudio();">
      Fast forward
    </button>
    <button onclick="restartAudio();">
      Restart
    </button>
  </body>
</html>

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