Created
February 25, 2016 15:46
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> | |
<title>Fake auto play html audio in iOS Safari the right way</title> | |
</head> | |
<body> | |
<h1>在 iOS Safari 中假装自动播放 HTML5 audio(音乐) 的正确方式</h1> | |
<p>核心原理: 通过一个用户交互事件来主动 play 一下 audio</p> | |
<br> | |
<br> | |
<br> | |
<audio id="bgmusic" autoplay preload loop controls></audio> | |
<script> | |
(function() { | |
function log(info) { | |
console.log(info); | |
// alert(info); | |
} | |
function forceSafariPlayAudio() { | |
audioEl.load(); // iOS 9 还需要额外的 load 一下, 否则直接 play 无效 | |
audioEl.play(); // iOS 7/8 仅需要 play 一下 | |
} | |
var audioEl = document.getElementById('bgmusic'); | |
// 可以自动播放时正确的事件顺序是 | |
// loadstart | |
// loadedmetadata | |
// loadeddata | |
// canplay | |
// play | |
// playing | |
// | |
// 不能自动播放时触发的事件是 | |
// iPhone5 iOS 7.0.6 loadstart | |
// iPhone6s iOS 9.1 loadstart -> loadedmetadata -> loadeddata -> canplay | |
audioEl.addEventListener('loadstart', function() { | |
log('loadstart'); | |
}, false); | |
audioEl.addEventListener('loadeddata', function() { | |
log('loadeddata'); | |
}, false); | |
audioEl.addEventListener('loadedmetadata', function() { | |
log('loadedmetadata'); | |
}, false); | |
audioEl.addEventListener('canplay', function() { | |
log('canplay'); | |
}, false); | |
audioEl.addEventListener('play', function() { | |
log('play'); | |
// 当 audio 能够播放后, 移除这个事件 | |
window.removeEventListener('touchstart', forceSafariPlayAudio, false); | |
}, false); | |
audioEl.addEventListener('playing', function() { | |
log('playing'); | |
}, false); | |
audioEl.addEventListener('pause', function() { | |
log('pause'); | |
}, false); | |
// 由于 iOS Safari 限制不允许 audio autoplay, 必须用户主动交互(例如 click)后才能播放 audio, | |
// 因此我们通过一个用户交互事件来主动 play 一下 audio. | |
window.addEventListener('touchstart', forceSafariPlayAudio, false); | |
audioEl.src = 'http://www.w3school.com.cn/i/song.mp3'; | |
})(); | |
</script> | |
</body> | |
</html> |
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