html5 audio 速度问题

浏览数：32 / 时间：2015年06月09日

 <!DOCTYPE html>
<html>
  <head>
    <title>Audio playbackRate Example</title>  
</head>
<body>
<div>
  <audio id="audio1" style="width:25%" controls>Canvas not supported</audio>
</div>
<div>
<input type="text" id="audioFile" value="audio.mp3" size="60" />

</div>
  <button id="playbutton" onclick="togglePlay();">Play</button>  
  <button onclick="increaseSpeed();">Increase speed</button>
  <button onclick="decreaseSpeed();">Decrease speed</button><br />
  <div id="rate"></div>

     <script type="text/javascript">
       // Create a couple of global variables to use. 
       var audioElm = document.getElementById("audio1"); // Audio element
       var ratedisplay = document.getElementById("rate"); // Rate display area

       // Hook the ratechange event and display the current playbackRate after each change
       audioElm.addEventListener("ratechange", function () {
         ratedisplay.innerHTML = "Rate: " + audioElm.playbackRate;
       }, false);

       //  Alternates between play and pause based on the value of the paused property
       function togglePlay() {
         if (document.getElementById("audio1")) {

           if (audioElm.paused == true) {
             playAudio(audioElm);    //  if player is paused, then play the file
           } else {
             pauseAudio(audioElm);   //  if player is playing, then pause
           }
         }
       }

       function playAudio(audioElm) {
         document.getElementById("playbutton").innerHTML = "Pause"; // Set button text == Pause
         // Get file from text box and assign it to the source of the audio element 
         audioElm.src = document.getElementById(‘audioFile‘).value;
         audioElm.play();
       }

       function pauseAudio(audioElm) {
         document.getElementById("playbutton").innerHTML = "play"; // Set button text == Play
         audioElm.pause();
       }

       // Increment playbackRate by 1 
       function increaseSpeed() {
         audioElm.playbackRate += 1;
       }

       // Cut playback rate in half
       function decreaseSpeed() {
         if (audioElm.playbackRate <= 1) {
           var temp = audioElm.playbackRate;
           audioElm.playbackRate = (temp / 2); 
         } else {
           audioElm.playbackRate -= 1;
         }
       }

     </script>


</body>
</html>

html5 audio 速度问题,古老的榕树,5-wow.com

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html5 audio 速度问题