高效檢測設備是否會播放具有自動播放屬性的無聲視頻

現在，Chrome 53和iOS 10都支持Android和iOS設備，能夠自動播放靜音並具有autoplay屬性的視頻。我想知道如何使用JavaScript來檢測。高效檢測設備是否會播放具有自動播放屬性的無聲視頻

使用Chrome 53，<video>必須有autoplay和muted屬性（是的，即使視頻文件沒有任何音軌muted屬性是必需的）。

對於iOS 10，<video>必須有autoplay屬性，並且對於非iPad等iOS設備10的playsinline屬性太（是的，它必須是playsinline; webkit-playsinline將無法正常工作）。

所以一個<video>會自動在這兩個瀏覽器53和iOS玩10（包括非iPad等iOS設備的10），如果它有三個屬性：autoplay，muted和playsinline。

如果我只是有興趣在iOS 10設備上檢測此代碼，代碼將非常簡單。我使用jQuery，但是這可以很容易地轉換成香草的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，唯一的辦法我發現這樣做是相當複雜：

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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">').on('play', function() { 
    muted_videos_autoplay = true; 
    $(this).remove(); 
}).appendTo('body'); 

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

對於記錄中，我從here獲得了視頻源。

我可以使Chrome 53代碼適用於所有iOS 10設備，只需將playsinline屬性添加到<video>上即可附加到<body>。但是，如果可能的話，我想找到更有效的方法來檢測此行爲。有人知道嗎？

來源

2016-09-16 Nick

不能肯定你要實現的目標是什麼？檢查元素'html'的屬性？ – guest271314

Chromes play函數返回一個承諾（不知道這是否也在53更新或它發生了多長時間） - [this code]（https://github.com/samdutton/simpl/blob/gh-pages/video/scripted /index.html）可能對你有用 - 實際上在https://github.com/samdutton/simpl/tree/gh-pages/video中可能有很多有用的東西 –

@ guest271314一個例子是執行如果瀏覽器能夠自動播放靜音視頻，則會顯示靜音視頻幻燈片。否則，請顯示靜態圖像幻燈片。 – Nick

您可以通過檢查視頻元素的暫停狀態在編程播放後是否更改來檢測視頻自動播放支持。僅此一項就會在一些移動瀏覽器中返回錯誤的否定結果，因此應該添加Promise檢查以覆蓋這些。

此方法適用於所有主流瀏覽器（臺式機和移動設備），Android < = 4.0和Windows Phone除外，該方法返回假陰性。

下面是偵測功能：

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 :(
    } 
});

現場測試：https://codepen.io/paulorely/pen/QveEGy

來源

2017-06-09 08:01:54

高效檢測設備是否會播放具有自動播放屬性的無聲視頻

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