如何检测是否支持 HTML5 自动播放属性？

Question

如何最好地检测浏览器的 HTML5 视频元素是否支持自动播放？

例如，在当前的 iOS Safari 上，自动播放是已禁用。

更新：我现在设计的网页的方式使其无论是否支持自动播放都可以正常工作。现在，当页面加载时，会显示一个初始化视频。在 iPad 上，用户会看到一个大的播放按钮。一旦触发播放，视频就会隐藏。之后，可以通过 JavaScript 控制视频播放器的播放，这就是我的目的实际需要。

Answer 1

聚会有点晚了，但接受的解决方案似乎已经过时了：Modernizr 现在已经实现了此功能，请参阅 https://github.com/Modernizr/Modernizr/blob/master/feature-detects/video/autoplay.js

包含与发布的其他解决方案类似的黑客攻击不过，只要浏览器不公开此功能的可用性，这似乎是目前最好的解决方案。

请注意，这是自 Modernizr 3 起可用的异步测试，因此您必须使用以下 .on() 语法进行测试：

Modernizr.on('videoautoplay', function(result){
  if(result) {
    alert('video autoplay is supported');
  }  else {
    alert('video autplay is NOT supported');
  }
});

亲自查看：http://codepen.io/anon/pen/VYoWWY?editors=001

上面的示例包括 Modernizr 3 以及“videoautplay”功能检测 (http://v3.modernizr.com/download/#-videoautoplay）。

Answer 2

也许这会帮助像我这样的未来谷歌人 -
此函数创建/删除视频并测试它是否可以自动播放。然后它将全局变量“autoplay”设置为 true 或 false。它测试 MP4 和 webM 兼容性，但如果需要的话添加更多内容并不困难（只需进行 Base 64 编码并附加另一个源）。
“可接受的延迟”变量是设备开始播放测试视频所需的合理时间。由于带宽/处理能力有限，有时即使支持自动播放，使用后备（非自动播放）解决方案也是有意义的。我一般用100ms。

function detect_autoplay(acceptable_delay){

    autoplay = false;  

    var autoplay_test_content = document.createElement('video');

   //create mp4 and webm sources, 5s long
        var mp4 = document.createElement('source');
        mp4.src = "data:video/mp4;base64,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";

        var webm = document.createElement('source');
        webm.src = "data:video/webm;base64,GkXfo49CgoR3ZWJtQoeBAUKFgQEYU4BnAQAAAAAAF60RTZt0vE27jFOrhBVJqWZTrIIQA027jFOrhBZUrmtTrIIQbE27jFOrhBFNm3RTrIIXmU27jFOrhBxTu2tTrIIWs+xPvwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA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   //append sources to test video 
        autoplay_test_content.appendChild(webm);
        autoplay_test_content.appendChild(mp4);

  //set attributes -needs to be visible or IE squawks, so we move it way outside  
    autoplay_test_content.id = "base64_test_video";
    autoplay_test_content.autoplay = true;
    autoplay_test_content.style.position = "fixed";
    autoplay_test_content.style.left = "5000px";

  //add to DOM       
    document.getElementsByTagName("body")[0].appendChild(autoplay_test_content);


    var base64_test_video = document.getElementById("base64_test_video");

  //test for autoplay, 100 ms buffer   
    setTimeout(function(){
        if(!base64_test_video.paused){
            autoplay = true;
        }

        document.getElementsByTagName("body")[0].removeChild(autoplay_test_content);

    },acceptable_delay);

}

detect_autoplay(100);

Answer 3

据我所知， Modernizr 和 深入研究 HTML5 的检测指南了解如何检测是否支持自动播放。 （尽管Modernizr 的“UnDetectables”页面未列出自动播放 ）

我弹出了 一个测试页面，它会提醒新创建的 元素上的 autoplay 属性的值，并且 Safari 上Mac OS X 上的 iOS 4.3 和 Chrome 13 返回 false（与 IE 6 返回的 undefined 相反）。

因此，不幸的是，您最好的选择可能是求助于浏览器检测，并维护您自己的支持自动播放的浏览器列表。

Answer 4

这是一种替代解决方案，它使用回调和会话存储来测试 HTML5 视频自动播放支持。一旦执行测试并且会话存储存在，在下一个会话之前不会再次执行检查。这样就可以避免每次加载页面时都运行它。它使用 base64 的 1 秒空白视频剪辑来测试自动播放支持。

https://gist.github.com/nathansearles/271870d4100f0f045c5c

    // isAutoplaySupported(callback);
    // Test if HTML5 video autoplay is supported
    isAutoplaySupported = function(callback) {
      // Is the callback a function?
      if (typeof callback !== 'function') {
        console.log('isAutoplaySupported: Callback must be a function!');
        return false;
      }
      // Check if sessionStorage exist for autoplaySupported,
      // if so we don't need to check for support again
      if (!sessionStorage.autoplaySupported) {
        // Create video element to test autoplay
        var video = document.createElement('video');
        video.autoplay = true;
        video.src = 'data:video/mp4;base64,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';
        video.load();
        video.style.display = 'none';
        video.playing = false;
        video.play();
        // Check if video plays
        video.onplay = function() {
          this.playing = true;
        };
        // Video has loaded, check autoplay support
        video.oncanplay = function() {
          if (video.playing) {
            sessionStorage.autoplaySupported = 'true';
            callback(true);
          } else {
            sessionStorage.autoplaySupported = 'false';
            callback(false);
          }
        };
      } else {
        // We've already tested for support
        // use sessionStorage.autoplaySupported
        if (sessionStorage.autoplaySupported === 'true') {
          callback(true);
        } else {
          callback(false);
        }
      }
    }

    // Usage: isAutoplaySupported(callback);
    // Using a callback assures that support
    // has been properly checked
    isAutoplaySupported(function(supported) {
      if (supported) {
        // HTML5 Video Autoplay Supported!
        console.log('HTML5 Video Autoplay Supported!');
      } else {
        // HTML5 Video Autoplay Not Supported :(
        console.log('HTML5 Video Autoplay Not Supported :(');
      }
    });

Answer 5

我意识到这是一个视频问题 - 它也适用于音频。

我构建了一个音频测试，目的是使用 Modernizr.addTest() 将其加载到 Moderizr 中。

结果令人惊讶，并且非常依赖于平台和系统状态。事实证明，有几种 Android 浏览器支持自动播放。谁知道呢。

通过查看 GitHub，我想 Modernizr 的人会更可靠、更优雅地解决这一切比我有——如果他们还没有的话。这似乎归结为时间问题。你可能会认为浏览器开发人员会在这里向我们扔一根骨头。也许他们会的。

无论如何，这是 jsfiddle 链接：Audio().autoplay test。

虽然 jsfiddle 示例中有一些无用的代码，但核心是：

var supportsAutoplay = false; //assume
var audio = new Audio();
var waitTime;
audio.autoplay = true;
audio.volume = 0;

// this will only be triggered if autoplay works
audio.addEventListener('play', function () {
    supportsAutoplay = true;
});

audio.src = testSrc; //see if the listener is listening

setTimeout(          //wait for listener to run
    function(){
        return supportsAutoplay;
    },
    waitTime
); 

虽然除了上面的那个（Modernizr 的人谈论它）之外，我还没有见过带有 setTimeout 的代码，但有几个版本周围的代码。我想我会归功于Peter Coles。也许他的版本不太可能遇到时间问题。

Answer 6

上述脚本和 Modernizr 检测不可靠的原因可能是它们没有通过 Apple 制定的所有限制：

• 视频必须静音
• 视频必须 设置为内嵌播放
• 视频必须具有尺寸（0x0 像素将失败）
• 视频必须在视口中可见（无不透明效果，显示：无或可见：隐藏）

我想出了一个小的 jQuery 插件来检测自动播放。看看它是否更可靠：

(function ($) {
   $.extend({
      'canVideoautoplay' : function ( callback ) {

         var testStarted = false;
         try {

            var playsinline = navigator.userAgent.match(/(iPhone|iPod)/g) ? ('playsInline' in document.createElement('video')) : true;
            if (!playsinline) {
               return callback(false);
            }

            var src = 'data:video/mp4;base64,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';
            var $video = $('<video src="'+src+'" controls playsinline muted width="20" height="20" style="position:fixed;z-index:1000;top:0;left:0"></video>');
            $('body').prepend($video);

            testStarted = true;
            $video[0].play();

            $video[0].onplay = function() {
               this.playing = true;
            };

            $video[0].oncanplay = function() {
               if ($video[0].playing) {
                  callback(true);
               } else {
                  callback(false);
               }
               $video[0].pause();
               $video.remove();
            };
         } catch(e) {}

         if (!testStarted) {
            callback(false);
         }
      }
   });
})(jQuery);

你可以这样使用它：

$(function () {
   $.canVideoautoplay(function ( canAutoplay ) {
      alert('Can we autoplay? ' + canAutoplay);
   });
});

Answer 7

Modernizr 自动播放测试存在一些可靠性问题，如下所示： https://github.com/Modernizr/ Modernizr/issues/1095

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漏报，因此应添加 Promise 检查以覆盖这些情况。

此方法适用于所有主要浏览器（桌面和移动设备），但 Android <= 4.0 和 Windows Phone 除外，在这些浏览器中它会返回漏报。

这是检测功能：

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 :(
  }
});

实时测试： https://codepen.io/paulorely/pen/QveEGy

Answer 8

这最适合检查自动播放。

var playPromise = document.querySelector('video').play();

// In browsers that don’t yet support this functionality,
// playPromise won’t be defined.
if (playPromise !== undefined) {
  playPromise.then(function() {
    // Automatic playback started!
  }).catch(function(error) {
    // Automatic playback failed.
    // Show a UI element to let the user manually start playback.
  });
}

取自这里。

HTML5 video.play 返回待处理的承诺

Answer 9

也许我回复有点晚了，但我只是测试了一个对我来说效果很好的解决方案：

var loadStarted = false;

video.onloadstart = function(){
    loadStarted = true;
};

function checkRunning(){
    if(!loadStarted) removeVideo();
}

setTimeout(checkRunning, 1000);

setTimeout 不是很干净，但整体解决方案非常简单！

Answer 10

也许你觉得它很有用。我将此线程中建议的所有评论合并到此解决方案中：
https://github.com/kaufguy/autoplay-detector

此处演示：
我也

将其限制为仅限内联播放。

var MUTE_DELAY_PORTION = 25;

var isAutoplaySupported = function (callback, timeout) {
    var called = false;
    if (!callback) {
        return;
    }
    if (!isPlaysinline()) {
        return callback({ autoplay: false, muted: false });
    }
    checkAutoplay(false, function () { testHandler(false); });
    setTimeout(function () {
        checkAutoplay(true, function () { testHandler(true); });
    }, timeout / MUTE_DELAY_PORTION);
    var testHandler = function (mute) {
        if (!called) {
            called = true;
            callback({ autoplay: true, muted: mute });
        }
    };
    setTimeout(function () {
        if (!called) {
            called = true;
            callback({ autoplay: false, muted: false });
        }
    }, timeout);
};

var checkAutoplay = function (mute, callback) {
    var video = document.createElement('video');
    video.ontimeupdate = function () {
        if (video.currentTime != 0) {
            return callback();
        }
        ;
    };
    video.autoplay = true;
    video.muted = mute;
    video.setAttribute('webkit-playsinline', 'webkit-playsinline');
    video.setAttribute('playsinline', 'playsinline');
    video.src = 'data:audio/mpeg;base64,/+MYxAAAAANIAUAAAASEEB/jwOFM/0MM/90b/+RhST//w4NFwOjf///PZu////9lns5GFDv//l9GlUIEEIAAAgIg8Ir/JGq3/+MYxDsLIj5QMYcoAP0dv9HIjUcH//yYSg+CIbkGP//8w0bLVjUP///3Z0x5QCAv/yLjwtGKTEFNRTMuOTeqqqqqqqqqqqqq/+MYxEkNmdJkUYc4AKqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq';
    video.style.display = 'none';
    video.load();
    video.play();
    return video;
};

var isPlaysinline = function () {
    return navigator.userAgent.match(/(iPhone|iPod)/g) ? ('playsInline' in document.createElement('video')) : true;
};

isAutoplaySupported(function(autoplayResult){
    //do somthing
}, 400)

对我有用...