有效检测设备是否会播放具有自动播放属性的静音视频答案

【问题标题】：Efficiently detect if a device will play silent videos that have the autoplay attribute有效检测设备是否会播放具有自动播放属性的静音视频
【发布时间】：2017-01-24 05:06:30
【问题描述】：

随着 Chrome 53 和 iOS 10 的推出，现在 Android 和 iOS 设备能够自动播放无声视频并具有 autoplay 属性。我想知道如何用 JavaScript 检测到这一点。

对于 Chrome 53，<video> 必须具有 autoplay 和 muted 属性（是的，即使视频文件没有任何音轨，muted 属性也是必需的。

对于 iOS 10，<video> 必须具有 autoplay 属性，对于非 iPad iOS 10 设备，playsinline 属性也必须是 playsinline；webkit-playsinline 不会工作）。

因此，如果<video> 具有所有三个属性：autoplay、muted 和 playsinline，它将自动在 Chrome 53 和 iOS 10（包括非 iPad iOS 10 设备）中播放。

如果我只是对在 iOS 10 设备上检测到这一点感兴趣，代码会非常简单。我正在使用 jQuery，但这可以很容易地转换为 vanilla JavaScript：

var muted_videos_autoplay = false;

$('<video playsinline>').on('play', function() {
  muted_videos_autoplay = true;
})[0].play();

setTimeout(function() {
  alert('muted_videos_autoplay: ' + muted_videos_autoplay);
}, 300);

但在 Chrome 53 上，我发现这样做的唯一方法非常复杂：

var muted_videos_autoplay = false;

$('<video autoplay muted style="position: fixed; top: 0; opacity: 0; pointer-events: none;" src="data:video/mp4;base64, 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MTAw">').on('play', function() {
  muted_videos_autoplay = true;
  $(this).remove();
}).appendTo('body');

setTimeout(function() {
  alert('muted_videos_autoplay: ' + muted_videos_autoplay);
}, 300);

为了记录，我从here得到了视频源。

我也可以通过将playsinline 属性添加到附加到<body> 的<video> 上，使 Chrome 53 代码适用于所有 iOS 10 设备。但如果可能的话，我想找到一种更有效的方法来检测这种行为。有人知道吗？

【问题讨论】：

不确定您要达到的目标是什么？检查元素html的属性？
Chrome 播放函数返回一个承诺（不确定这是否也在 53 更新中或发生了多长时间） - this code 可能对你有用 - 实际上可能有很多有用的东西在github.com/samdutton/simpl/tree/gh-pages/video
@guest271314 例如，执行检测，如果浏览器能够自动播放无声视频，则显示无声视频幻灯片。否则，显示静止图像幻灯片。
"如果浏览器能够自动播放无声视频" 您可以在canplay 事件中将.volume 设置为0。

标签： javascript android ios google-chrome html5-video

【解决方案1】：

您可以通过检查视频元素的暂停状态在以编程方式播放后是否发生变化来检测视频自动播放支持。仅此一项就可能在某些移动浏览器中返回误报，因此应添加 Promise 检查以涵盖这些情况。

此方法适用于所有主要浏览器（桌面和移动），但 Android

这里是检测函数：

var supports_video_autoplay = function(callback) {

  if (typeof callback !== "function") return false;

  var v = document.createElement("video");
  v.paused = true;
  var p = "play" in v && v.play();

  callback(!v.paused || ("Promise" in window && p instanceof Promise));

};

用法：

supports_video_autoplay(function(supported) {
  if (supported) {
    // video autoplay supported!
  } else {
    // no video autoplay support :(
  }
});

现场测试：https://codepen.io/paulorely/pen/QveEGy

【讨论】：