HTML5之audio：键盘控制音乐播放

今天下午学了下audio玩，功能很简单，主要就是通过键盘来控制音乐播放。

HTML：

<html>
<head>
<title> HTML5 </title>
</head>
<body>
<audio id="audio" controls="controls">
	<source src="枫.ogg" type="audio/ogg"></source>
	<source src="枫.mp3" type="audio/mp3"></source>
</audio>
<script type="text/javascript" src="html5.js"></script>
</body>
</html>

JavaScript：

var audio = document.getElementById(\'audio\');
audio.play();
document.body.onkeyup = function(e){  //亦可绑定到audio，当鼠标点击到audio之后再按键可触发
	var event = e || window.event;
	console.log(\'keyCode : \' + event.keyCode);
	console.log(\'volume : \' + audio.volume);
	if(!arguments.callee.pause){
		arguments.callee.pause = false;
	}
	if(event.keyCode == 40){  //下
		try {
			audio.volume -= 0.1;
		}catch(e){
			console.log(\'audio.volume is already the smallest : \' + audio.volume);
		}
	}else if(event.keyCode == 38){  //上
		try {
			audio.volume += 0.1;
		}catch(e){
			console.log(\'audio.volume is already the largest : \' + audio.volume);
		}
	}else if(event.keyCode == 39){  //右
		audio.currentTime += 10;
	}else if(event.keyCode == 37){  //左
		audio.currentTime -= 10;
	}else if(event.keyCode == 32){
		if(!arguments.callee.pause){
			arguments.callee.pause = true;
			audio.pause();
		}else{
			arguments.callee.pause = false;
			audio.play();
		}
	}
	console.log(\'currentTime : \' + audio.currentTime);
};