html5 - audio音频自动播放问题

Question

在页面上有audio标签，页面加载完用play()方法开始播放，在微信里面可以正常播放，IOS和Android都没问题。但是在app里面不行，需要手动触发。用Safari和安卓的内置浏览器都不能自动播放。
IOS上微信内置浏览器不是调用Safari的吗，很奇怪为什么在微信可以播放，在Safari就不行

<audio src="music.mp3" id="audio"></audio>
<script>
window.onload = function() {
    var audio = document.getElementById('audio');
    audio.play();
}
</script>

Answer 1

TryautoplayAttributes

<audio src="music.mp3" autoplay="autoplay"></audio>

Answer 2

Safari on iOS has this disabled:

the JavaScript play() and load() methods are also inactive until the user initiates playback, unless the play() or load() method is triggered by user action

-https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/Device-SpecificConsiderations/Device-SpecificConsiderations.html#//apple_ref/doc/uid/TP40009523-CH5-SW1

WeChat browser uses its own X5 kernel