HTML5-视频播放时每隔几秒钟触发一次事件

Question

我想通过跟踪在不同时间间隔掉多少用户来跟踪视频的用户参与度。

为此，我需要在视频播放时每15秒触发一次跟踪事件。

playing事件被触发一次。 我需要在视频的整个生命周期中都可以使用的东西。

var _video = $('video')[0],
        timeoutID;
    $(_video).on('playing', function(event){
        timeoutID = window.setTimeout(function() {
            console.log("video is playing");
        }, 15000);
    }).on('ended', function(event){
        console.log("video eneded");
        window.clearTimeout(timeoutID);
    });

Answer 1

您可以改用timeupdate事件，它会在视频的currentTime变化时更新，换句话说，它会在视频播放时更新，并为您提供用户实际观看的视频量

var _video = $('video')[0];

$(_video).on('timeupdate', function() {
    var hasPlayedTime = _video.currentTime;
});

 var _video = $('video')[0]; $(_video).on('timeupdate', function(event){ var hasPlayedTime = _video.currentTime; $('#result').html('<strong>Elapsed : </strong>' + hasPlayedTime); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <video controls="" style="width:240px;height:180px;"> <source src="http://www.html5rocks.com/en/tutorials/video/basics/devstories.webm" type="video/webm;codecs=&quot;vp8, vorbis&quot;" /> <source src="http://www.html5rocks.com/en/tutorials/video/basics/devstories.mp4" type="video/mp4;codecs=&quot;avc1.42E01E, mp4a.40.2&quot;" /> </video> <span id="result" style="position:relative; top: -100px; left: 20px"></span> 

为了仅每15秒对这样的事件进行操作，我们需要添加一些数学和逻辑

 var _video = $('video')[0], debounce = true, seconds = 5; // set to 15 instead $(_video).on('timeupdate', function(event){ var hasPlayedTime = _video.currentTime; var intPlayedTime = parseInt(hasPlayedTime, 10); var isFifteen = intPlayedTime % seconds === 0 && intPlayedTime !== 0; if (isFifteen && debounce) { debounce = false; $('#result span').html(intPlayedTime); } else { setTimeout(function() { debounce = true; }, 1000); } }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js" controls="controls"></script> <video controls="" style="width:240px;height:180px; position: relative; top: -20px; float:left"> <source src="http://www.html5rocks.com/en/tutorials/video/basics/devstories.webm" type="video/webm;codecs=&quot;vp8, vorbis&quot;" /> <source src="http://www.html5rocks.com/en/tutorials/video/basics/devstories.mp4" type="video/mp4;codecs=&quot;avc1.42E01E, mp4a.40.2&quot;" /> </video> <span id="result" style="position:relative; top: 70px; left: 20px"> <p><u>Updates every five seconds</u></p> <strong>Elapsed : </strong> <span>0</span> </span> 

Answer 2

使用window.setInterval而不是window.setTimeout

$(_video).on('playing', function(event){
        timeoutID = window.setInterval(function() {
            console.log("video is playing");
        }, 15000);
    }).on('ended', function(event){
        console.log("video eneded");
        window.clearInterval(timeoutID);
    });

Answer 3

我做了这个

var lastSecond = null;
var secondsToCallFunction = 20;
$(_video).on('timeupdate', function(e) {
 var seconds = Math.floor(e.target.currentTime);
 if (seconds % secondsToCallFunction  == 0 && lastSecond !== seconds) {
    lastSecond = seconds
    console.log(seconds);
}
});