html5中 media（播放器）的api使用指南
直接奉上示例代码，废话就不多说了。
代码如下:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>HTML Audio API</title>
<link rel="stylesheet" href="./style/main.css" />
<script src="./script/audio-controls.js"></script>
</head>
<body>
<header>
<h1>HTML5 Audio API</h1>
<p>HTML5 Audio API demo by <a%20href="<a%20href="http://github.com/LearnShare">http://github.com/LearnShare</a>" target="_blank">LearnShare</a>.</p>
<p>
Last update @2013-04-23 20:40:00
+ add info table
update @2013-04-22 14:54:00
+ add DOM events
update @2013-04-22 12:47:00
+ add getCurrentSrc button
</p>
<p>
View code on <a%20href="<a%20href="http://github.com/LearnShare/LearnShare.github.io/tree/master/labs/audio/">http://github.com/LearnShare/LearnShare.github.io/tree/master/labs/audio/</a>" target="_blank">LearnShare.github.io</a>.
API reference: <a%20href="<a%20href="https://developer.mozilla.org/zh-CN/docs/DOM/HTMLMediaElement">https://developer.mozilla.org/zh-CN/docs/DOM/HTMLMediaElement</a>" target="_blank">HTMLMediaElement</a> and <a%20href="<a%20href="http://www.w3schools.com/tags/ref_av_dom.asp">http://www.w3schools.com/tags/ref_av_dom.asp</a>" target="_blank">Audio/Video DOM References</a>
</p>
</header>
<article>
<section>
<h2>Audio Element</h2>
<audio id="audio" src="./media/music1.mp3" controls="controls"></audio>
<p>Open the <strong>developer tool</strong> to view console logs.</p>
</section>
<section>
<h2>Controls</h2>
<button id="play">play</button>
<button id="pause">pause</button>
<button id="get_paused">getPaused</button>
<button id="get_ended">getEnded</button>
<button id="volume_down">volume-</button>
<button id="volume_up">volume+</button>
<button id="get_volume">getVolume</button>
<button id="get_src">getSrc</button>
<button id="play_music1">playMusic1</button>
<button id="play_music2">playMusic2</button>
<button id="remove_music">removeMusic</button>
<button id="get_current_src">getCurrentSrc</button>
<button id="get_initial_time">getInitialTime</button>
<button id="get_duration">getDuration</button>
<button id="get_seeking">getSeeking</button>
<button id="jump_to">jumpTo_30s</button>
<button id="get_current_time">getCurrentTime</button>
<button id="get_played">getPlayed</button>
<button id="autoplay_on">autoplay_on</button>
<button id="autoplay_off">autoplay_off</button>
<button id="get_autoplay">getAutoplay</button>
<button id="controls_show">controls_show</button>
<button id="controls_hide">controls_hide</button>
<button id="get_controls">getControls</button>
<button id="loop_on">loop_on</button>
<button id="loop_off">loop_off</button>
<button id="get_loop">getLoop</button>
<button id="preload_metadata">preload_metadata</button>
<button id="get_preload">getPreload</button>
<button id="get_default_muted">getDefaultMuted</button>
<button id="mute">mute</button>
<button id=
"unmute">unmute</button>
<button id="get_muted">getMuted</button>
<button id="get_default_playback_rate">getDefaultPlaybackRate</button>
<button id="playback_rate_down">playbackRate-</button>
<button id="playback_rate_up">playbackRate+</button>
<button id="get_playback_rate">getPlaybackRate</button>
<button id="get_network_state">getNetworkState</button>
<button id="get_ready_state">getReadyState</button>
<button id="get_buffered">getBuffered</button>
<button id="get_seekable">getSeekable</button>
</section>
</article>
<aside>
<section>
<h3>Player Attrs</h3>
<table>
<tr>
<td>autoplay:</td>
<td id="autoplay"></td>
</tr>
<tr>
<td>controls:</td>
<td id="controls"></td>
</tr>
<tr>
<td>defaultMuted:</td>
<td id="default_muted"></td>
</tr>
<tr>
<td>defaultPlaybackRate:</td>
<td id="default_playback_rate"></td>
</tr>
<tr>
<td>loop:</td>
<td id="loop"></td>
</tr>
<tr>
<td>preload:</td>
<td id="preload"></td>
</tr>
</table>
</section>
<section>
<h3>Player Info</h3>
<table>
<tr>
<td>src:</td>
<td id="src"></td>
</tr>
<tr>
<td>currentSrc:</td>
<td id="current_src"></td>
</tr>
<tr>
<td>duration:</td>
<td id="duration"></td>
</tr>
<tr>
<td>currentTime:</td>
<td id="current_time"></td>
</tr>
<tr>
<td>ended:</td>
<td id="ended"></td>
</tr>
<tr>
<td>paused:</td>
<td id="paused"></td>
</tr>
<tr>
<td>muted:</td>
<td id="muted"></td>
</tr>
<tr>
<td>volume:</td>
<td id="volume"></td>
</tr>
<tr>
<td>playbackRate:</td>
<td id="playback_rate"></td>
</tr>
</table>
</section>
<section>
<h3>Play status</h3>
<table>
<tr>
<td>networkState:</td>
<td id="network_state"></td>
</tr>
<tr>
<td>readyState:</td>
<td id="ready_state"></td>
</tr>
<tr>
<td>buffered:</td>
<td id="buffered"></td>
</tr>
<tr>
<td>seekable:</td>
<td id="seekable"></td>
</tr>
<tr>
<td>played:</td>
<td id="played"></td>
</tr>
<tr>
<td>error:</td>
<td id="error"></td>
</tr>
</table>
</section>
</aside>
</body>
</html>
audio-controls.js
代码如下:
window.onload=function(){
// get autio element
var audio=document.getElementById("audio");
// play()
document.getElementById("play").onclick=function(){
audio.play();
console.log("play");
};
// pause()
document.getElementById("pause").onclick=function(){
audio.pause();
console.log("pause");
};
// get paused
document.getElementById("get_paused").onclick=function(){
console.log("audio.paused: "+audio.paused);
};
// get ended
document.getElementById("get_ended").onclick=function(){
console.log("audio.ended: "+audio.ended);
};
// set volume-
document.getElementById("volume_down").onclick=function(){
audio.volume-=0.2;
console.log("volume-0.2");
};
// set volume+
document.getElementById("volume_up").onclick=function(){
audio.volume+=0.2;
console.log("volume+0.2");
};
// get volume
document.getElementById("get_volume").onclick=function(){
console.log("audio.volume: "+audio.volume);
};
// get src
document.getElementById("get_src").onclick=function(){
console.log("audio.src: "+audio.src);
};
// set src_music1
document.getElementById("play_music1").onclick=function(){
audio.src="./media/music1.mp3";
updateSrc();
updateCurrentSrc();
console.log("play music1");
};
// set src_music2
document.getElementById("play_music2").onclick=function(){
audio.src="./media/music2.mp3";
updateSrc();
updateCurrentSrc();
console.log("play music2");
};
// set remove_music
document.getElementById("remove_music").onclick=function(){
audio.src="";
console.log("remove music");
};
// get currentSrc
document.getElementById("get_current_src").onclick=function(){
console.log("audio.currentSrc: "+audio.currentSrc);
};
// get initialTime
document.getElementById("get_initial_time").onclick=function(){
console.log("audio.initialTime: "+audio.initialTime);
};
// get duration
document.getElementById("get_duration").onclick=function(){
console.log("audio.duration: "+audio.duration);
};
// get seeking
document.getElementById("get_seeking").onclick=function(){
console.log("audio.seeking: "+audio.seeking);
};
// set currentTime
document.getElementById("jump_to").onclick=function(){
audio.currentTime=30;
console.log("jumpTo 30s");
};
// get currentTime
document.getElementById("get_current_time").onclick=function(){
console.log("audio.currentTime: "+audio.currentTime);
};
// get played
document.getElementById("get_played").onclick=function(){
console.log("audio.played:");
var ranges=audio.played;
var n=ranges.length;
for(var i=0;i<n;i++){
console.log("("+ranges.start(i)+","+ranges.end(i)+")");
}
};
// autoplay on
document.getElementById("autoplay_on").onclick=function(){
audio.autoplay=true;
updateAutoplay();
console.log("autoplay on");
};
// autoplay off
document.getElementById("autoplay_off").onclick=function(){
audio.autoplay=false;
updateAutoplay();
console.log("autoplay off");
};
// get autoplay
document.getElementById("get_autoplay").onclick=function(){
console.log("audio.autoplay: "+audio.autoplay);
};
// controls show
document.getElementById("controls_show").onclick=function(){
audio.controls=true;
updateControls();
console.log("controls show");
};
// controls hide
document.getElementById("controls_hide").onclick=function(){
audio.controls=false;
updateControls();
console.log("controls hide");
};
// get controls
document.getElementById("get_controls").onclick=function(){
console.log("audio.controls: "+audio.controls);
};
// loop on
document.getElementById("loop_on").onclick=function(){
audio.loop=true;
updateLoop();
console.log("loop on");
};
// loop off
document.getElementById("loop_off").onclick=function(){
audio.loop=false;
updateLoop();
console.log("loop off");
};
// get loop
document.getElementById("get_loop").onclick=function(){
console.log("audio.loop: "+audio.loop);
};
// preload metadata
document.getElementById("preload_metadata").onclick=function(){
audio.preload="metadata";
updatePreload();
console.log("preload metadata");
};
// get preload
document.getElementById("get_preload").onclick=function(){
console.log("audio.preload: "+audio.preload);
};
// get defaultMuted
document.getElementById("get_default_muted").onclick=function(){
console.log("audio.defaultMuted: "+audio.defaultMuted);
};
// mute
document.getElementById("mute").onclick=function(){
audio.muted=true;
updateMuted();
console.log("audio mute");
};
// unmute
document.getElementById("unmute").onclick=function(){
audio.muted=false;
updateMuted();
console.log("audio unmute");
};
// get muted
document.getElementById("get_muted").onclick=function(){
console.log("audio.muted: "+audio.muted);
};
// get defaultPlaybackRate
document.getElementById("get_default_playback_rate").onclick=function(){
console.log("audio.defaultPlaybackRate: "+audio.defaultPlaybackRate);
};
// set playbackRate-
document.getElementById("playback_rate_down").onclick=function(){
audio.playbackRate-=0.2;
console.log("playbackRate-0.2");
};
// set playbackRate+
document.getElementById("playback_rate_up").onclick=function(){
audio.playbackRate+=0.2;
console.log("playbackRate+0.2");
};
// get playbackRate
document.getElementById("get_playback_rate").onclick=function(){
console.log("audio.playbackRate: "+audio.playbackRate);
};
// get networkState
document.getElementById("get_network_state").onclick=function(){
console.log("audio.networkState: "+audio.networkState);
};
// get readyState
document.getElementById("get_ready_state").onclick=function(){
console.log("audio.readyState: "+audio.readyState);
};
// get buffered
document.getElementById("get_buffered").onclick=function(){
console.log("audio.buffered:");
var ranges=audio.buffered;
var n=ranges.length;
for(var i=0;i<n;i++){
console.log("("+ranges.start(i)+","+ranges.end(i)+")");
}
};
// get seekable
document.getElementById("get_seekable").onclick=function(){
console.log("audio.seekable:");
var ranges=audio.seekable;
var n=ranges.length;
for(var i=0;i<n;i++){
console.log("("+ranges.start(i)+","+ranges.end(i)+")");
}
};
// DOM events
// abort
audio.addEventListener("abort",function(){
console.log("event:abort");
});
// canplay
audio.addEventListener("canplay",function(){
console.log("event:canplay");
});
// canplaythrough
audio.addEventListener("canplaythrough",function(){
console.log("event:canplaythrough");
});
// durationchange
audio.addEventListener("durationchange",function(){
updateDuration();
console.log("event:durationchange");
});
// emptied
audio.addEventListener("emptied",function(){
updateSrc();
updateCurrentSrc();
updateDuration();
updatePaused();
updateNetworkState();
updateReadyState();
updateBuffered();
updateSeekable();
updatePlayed();
console.log("event:emptied");
});
// ended
audio.addEventListener("ended",function(){
updateEnded();
console.log("event:ended");
});
// loadeddata
audio.addEventListener("loadeddata",function(){
updateNetworkState();
updateReadyState();
updateBuffered();
updateSeekable();
console.log("event:loadeddata");
});
// loadedmetadata
audio.addEventListener("loadedmetadata",function(){
console.log("event:loadedmetadata");
});
// loadstart
audio.addEventListener("loadstart",function(){
console.log("event:loadstart");
});
// pause
audio.addEventListener("pause",function(){
updatePaused();
console.log("event:pause");
});
// play
audio.addEventListener("play",function(){
updatePaused();
console.log("event:play");
});
// playing
audio.addEventListener("playing",function(){
console.log("event:playing");
});
// progress
audio.addEventListener("progress",function(){
updateNetworkState();
updateReadyState();
updateBuffered();
updateSeekable();
console.log("event:progress");
});
// ratechange
audio.addEventListener("ratechange",function(){
updatePlaybackRate();
console.log("event:ratechange");
});
// seeked
audio.addEventListener("seeked",function(){
console.log("event:seeked");
});
// seeking
audio.addEventListener("seeking",function(){
console.log("event:seeking");
});
// stalled
audio.addEventListener("stalled",function(){
console.log("event:stalled");
});
// suspend
audio.addEventListener("suspend",function(){
console.log("event:suspend");
});
// timeupdate
audio.addEventListener("timeupdate",function(){
updateCurrentTime();
updateEnded();
updatePlayed();
console.log("event:timeupdate");
});
// volumechange
audio.addEventListener("volumechange",function(){
updateVolume();
console.log("event:volumechange");
});
// waiting
audio.addEventListener("waiting",function(){
console.log("event:waiting");
});
updateAutoplay();
updateControls();
updateDefaultMuted();
updateDefaultPlaybackRate();
updateLoop();
updatePreload();
updateSrc();
updateCurrentSrc();
updateDuration();
updateCurrentTime();
updateVolume();
updatePaused();
updateMuted();
updateEnded();
updatePlaybackRate();
updateNetworkState();
updateReadyState();
updateBuffered();
updateSeekable();
updatePlayed();
updateError();
};
// functions to update info table
// autoplay
function updateAutoplay(){
document.getElementById("autoplay").innerHTML=audio.autoplay;
}
// controls
function updateControls(){
document.getElementById("controls").innerHTML=audio.controls;
}
// defaultMuted
function updateDefaultMuted(){
document.getElementById("default_muted").innerHTML=audio.defaultMuted;
}
// defaultPlaybackRate
function updateDefaultPlaybackRate(){
document.getElementById("default_playback_rate").innerHTML=audio.defaultPlaybackRate;
}
// loop
function updateLoop(){
document.getElementById("loop").innerHTML=audio.loop;
}
// preload
function updatePreload(){
document.getElementById("preload").innerHTML=audio.preload;
}
// src
function updateSrc(){
document.getElementById("src").innerHTML=audio.src;
}
// currentSrc
function updateCurrentSrc(){
document.getElementById("current_src").innerHTML=audio.currentSrc;
}
// duration
function updateDuration(){
document.getElementById("duration").innerHTML=audio.duration;
}
// currentTime
function updateCurrentTime(){
document.getElementById("current_time").innerHTML=audio.cu
rrentTime;
}
// ended
function updateEnded(){
document.getElementById("ended").innerHTML=audio.ended;
}
// paused
function updatePaused(){
document.getElementById("paused").innerHTML=audio.paused;
}
// muted
function updateMuted(){
document.getElementById("muted").innerHTML=audio.muted;
}
// volume
function updateVolume(){
document.getElementById("volume").innerHTML=audio.volume;
}
// playbackRate
function updatePlaybackRate(){
document.getElementById("playback_rate").innerHTML=audio.playbackRate;
}
// networkState
function updateNetworkState(){
document.getElementById("network_state").innerHTML=audio.networkState;
}
// readyState
function updateReadyState(){
document.getElementById("ready_state").innerHTML=audio.readyState;
}
// buffered
function updateBuffered(){
var ranges=audio.buffered;
var str="";
var n=ranges.length;
for(var i=0;i<n;i++){
str+="("+ranges.start(i)+","+ranges.end(i)+")";
if(i!=n-1){
str+="
";
}
}
document.getElementById("buffered").innerHTML=str;
}
// seekable
function updateSeekable(){
var ranges=audio.seekable;
var str="";
var n=ranges.length;
for(var i=0;i<n;i++){
str+="("+ranges.start(i)+","+ranges.end(i)+")";
if(i!=n-1){
str+="
";
}
}
document.getElementById("seekable").innerHTML=str;
}
// played
function updatePlayed(){
var ranges=audio.played;
var str="";
var n=ranges.length;
for(var i=0;i<n;i++){
str+="("+ranges.start(i)+","+ranges.end(i)+")";
if(i!=n-1){
str+="
";
}
}
document.getElementById("played").innerHTML=str;
}
// error
function updateError(){
document.getElementById("error").innerHTML=audio.error;
}
