最小化窗口时HTML视频暂停

简单的javascript事件：

window.onfocus = function() { document.getElementById('player').play(); };
window.onblur = function() { document.getElementById('player').pause(); };

<video height="180" controls autoplay loop id=player>
  <source src="http://techslides.com/demos/sample-videos/small.mp4" type="video/mp4">
  <source src="http://techslides.com/demos/sample-videos/small.ogv" type="video/ogg">
  Your browser does not support HTML5 video.
</video>

带有EventListener的Javascript事件：

window.addEventListener("focus", aaa);
window.addEventListener("blur", bbb);
function aaa(){
document.getElementById('player').play();  
}
function bbb(){
document.getElementById('player').pause();
}

<video height="180" controls autoplay loop id=player>
  <source src="http://techslides.com/demos/sample-videos/small.mp4" type="video/mp4">
  <source src="http://techslides.com/demos/sample-videos/small.ogv" type="video/ogg">
  Your browser does not support HTML5 video.
</video>

视频来源：技术幻灯片

也许这对检测页面何时失去焦点或可见性很有用：Javascript可以检测用户是否更改选项卡

$(window).focus(function() {
    //do something
});
$(window).blur(function() {
    //do something
});

HTML

<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div id="youtube"></div>
<p id="status"></p> 

Javascript用于检测是否未聚焦：

//YouTube
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
$(function(){
  var youtubePlayer;
  var myWindow = window;
  onYouTubeIframeAPIReady = function(){
   youtubePlayer = new YT.Player('youtube', {
     height: '390',
     width: '640',
     videoId: 'sXtekwuT8R0',
     events: {
       'onReady': onPlayerReady,
       'onStateChange': onPlayerStateChange
     }
   });
  }
  onPlayerReady = function(event) {
   event.target.playVideo();
  };
  onPlayerStateChange = function(event) {
   if (event.data == YT.PlayerState.PLAYING) {
     $("#status").text("Playing!");
     myWindow.focus();
     myWindow.onblur = function() {
       $("#status").text("You went away!");
       youtubePlayer.stopVideo();
     };
   }
  };  
})

如果您需要进一步的帮助，请随时评论我的答案

您需要两件事的组合-

第一个是使用javascript以编程方式暂停视频的能力。

HTML

<video id="videoContainer" src="videoLink.ogg"></video>

JavaScript

document.getElementById('videoContainer').pause();

下一步是检测窗口是否在焦点上。要获得完整的答案，您应该查看以下问题的答案：是否有方法检测浏览器窗口当前是否处于非活动状态？

但是发布在那里的代码是为了浏览器的可比性而设置的，我不确定你需要多少，所以我建议你通读一遍，从中获取你需要的东西

(function() {
  var hidden = "hidden";
  // Standards:
  if (hidden in document)
    document.addEventListener("visibilitychange", onchange);
  else if ((hidden = "mozHidden") in document)
    document.addEventListener("mozvisibilitychange", onchange);
  else if ((hidden = "webkitHidden") in document)
    document.addEventListener("webkitvisibilitychange", onchange);
  else if ((hidden = "msHidden") in document)
    document.addEventListener("msvisibilitychange", onchange);
  // IE 9 and lower:
  else if ("onfocusin" in document)
    document.onfocusin = document.onfocusout = onchange;
  // All others:
  else
    window.onpageshow = window.onpagehide
    = window.onfocus = window.onblur = onchange;
  function onchange (evt) {
    var v = "visible", h = "hidden",
        evtMap = {
          focus:v, focusin:v, pageshow:v, blur:h, focusout:h, pagehide:h
        };
    evt = evt || window.event;
    if (evt.type in evtMap)
      document.body.className = evtMap[evt.type];
    else
      document.body.className = this[hidden] ? "hidden" : "visible";
  }
  // set the initial state (but only if browser supports the Page Visibility API)
  if( document[hidden] !== undefined )
    onchange({type: document[hidden] ? "blur" : "focus"});
})();