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标题: javascript - 有效检测设备是否会播放具有自动播放属性的静音视频 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 14:05
标题: javascript - 有效检测设备是否会播放具有自动播放属性的静音视频

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， 必须具有 autoplay 和 muted 属性(是的，muted 属性是必需的，即使视频文件没有任何音轨)。

对于 iOS 10， 必须具有 autoplay 属性，对于非 iPad iOS 10 设备，playsinline 属性也是(是的，它必须是 playsinline；webkit-playsinline 不起作用)。

因此，如果 具有所有三个属性，则 将在 Chrome 53 和 iOS 10(包括非 iPad iOS 10 设备)中自动播放:autoplay， 静音和playsinline。

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);

作为记录，我从 here 获得视频源.

通过将 playsinline 属性添加到附加到 的 上，我也可以使 Chrome 53 代码适用于所有 iOS 10 设备<正文>。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？

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Best Answer-推荐答案

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 <= 4.0 和 Windows Phone 除外，它会返回假阴性。

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 || ("romise" 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

关于javascript - 有效检测设备是否会播放具有自动播放属性的静音视频，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39523526/

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