HTML5音频随机播放
要随机播放，请添加以下歌曲-
init ([ 'http://demo.com/songs/song1.mp3, 'http://demo.com/songs/song2.mp3, 'http://demo.com/songs/song3.mp3 ]);
使用以下内容使用Math.random随机播放-
function displayRandom() {
var audio = Math.floor(Math.random() * (collection.length));
audio = collection[audio];
audio.play();
setTimeout(loop,audio.duration*1000);
}