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@wsgouwan
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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