iPhone：使用HTML5快进和快退 <audio> ＆playbackRate不起作用？

Question

I can't figure out how to do a simple fast forward and rewind on the iPhone for an audio player using HTML5. 我无法弄清楚如何在iPhone上为使用HTML5的音频播放器进行简单的快进和快退。 All the Apple documentation says that the playbackRate should be used for this. 所有Apple文档都说应该使用playbackRate。 I have watched the WWDC 2009 and 2010 sessions on this and downloaded all the example source code I can find but I still can't figure this out. 我已经看过WWDC 2009和2010年会议并下载了我能找到的所有示例源代码，但我仍然无法弄清楚这一点。 Is this only for video? 这仅适用于视频吗？ How do you do rewind and fast forward buttons then? 那你怎么做倒带和快进按钮呢？ Here is a small test example: 这是一个小测试示例：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd>">
<html>
<head>
    <title>Audio Player</title>
    <base href=".">
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.6, user-scalable=false”">
    <meta name="apple-mobile-web-app-capable" content="YES">
    <link rel="apple-touch-icon" href="Images/WebClipIcon.png">

    <script type="text/javascript">

         function pauseButton() {
             var myButton = document.getElementById("audiobutton");
                myButton.value = "||";
                myButton.style.opacity=".2";
            }

         function playButton() {
             var myButton = document.getElementById("audiobutton");
                myButton.value = ">";
                myButton.style.opacity=".5";
            }

         function playPause() {
              var audioElement = document.getElementsByTagName('audio')[0];
              if (audioElement.paused) {
                audioElement.play();
                pauseButton();
              }else{
                audioElement.pause();
                playButton();
              }
         }

         var updateProgress = function (e) {
           var percentDone = e.target.currentTime / e.target.duration;
         }

         function myAddListener() {

          var audioElement = document.getElementsByTagName('audio')[0];
           audioElement.playbackRate = 1.0;
       audioElement.addEventListener('progress', function(evt) { updateProgress(evt); }, false);
       audioElement.addEventListener('timeupdate', function(evt) { updateProgress(evt); }, false);
       audioElement.addEventListener('durationchange', function(evt) { updateProgress(evt); }, false);
         }


        function rewind() {
            var audioElement = document.getElementsByTagName('audio')[0];
            audioElement.playbackRate = -3.0;
         }

         function fastforward() {
            var audioElement = document.getElementsByTagName('audio')[0];
            audioElement.playbackRate = 3.0;
         }

   </script>
</head>
<body onload="myAddListener()">
<p>Audio Test<p/>
<audio id="myAudio" src="http://fotf.cdnetworks.net/fotf/mp3/fof_daily_broadcast/ffd_2010/2_april_may_june/ffd_20100607.mp3>" controls></audio><br/>
<input id="audiobutton" type=button onclick="playPause()" value="&gt;">
<input id="rewindbutton" type=button onclick="rewind()" value="&lt;&lt;">
<input id="forwardbutton" type=button onclick="fastforward()" value="&gt;&gt;">
</div>
</body>
</html>

Answer 1

It seems to work for me. 它似乎对我有用。

Three things I had to tweak in your example: 我必须在你的例子中调整三件事：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd>">
...
<p>Audio Test<p/>
...
<audio id="myAudio" src="http://fotf.cdnetworks.net/fotf/mp3/fof_daily_broadcast/ffd_2010/2_april_may_june/ffd_20100607.mp3>" controls></audio><br/>

were changed to: 被改为：

<!DOCTYPE html>
...
<p>Audio Test</p>
...
<audio id="myAudio" src="http://fotf.cdnetworks.net/fotf/mp3/fof_daily_broadcast/ffd_2010/2_april_may_june/ffd_20100607.mp3" controls></audio><br/>

Details 细节

Change your doctype to account for using HTML5 elements 将您的doctype更改为使用HTML5元素的帐户
Typo in your closing P tag 关闭P标签中的拼写错误
Typo in your src attribute 你的src属性中的错字

Please let me know if this doesn't work for you. 如果这不适合你，请告诉我。

iPhone：使用HTML5快进和快退 <audio> ＆playbackRate不起作用？

问题描述

1 个解决方案

解决方案1
2 2011-06-28 02:49:45

Details 细节

iPhone：使用HTML5快进和快退 <audio> ＆playbackRate不起作用？

问题描述

1 个解决方案

解决方案1 2 2011-06-28 02:49:45

Details 细节

解决方案1
2 2011-06-28 02:49:45