HTML DOM 视频 textTracks 属性
HTML DOM 视频 textTracks 属性返回一个 TextTrackList 对象,其中包含有关视频文本轨道的的信息。
语法
以下是语法 -
返回 TextTracksList 对象
mediaObject.textTracks
让我们看一个 **视频 textTracks** 属性的示例 -
示例
<!DOCTYPE html> <html> <head> <title>HTML DOM Video textTracks</title> <style> * { padding: 2px; margin:5px; } form { width:70%; margin: 0 auto; text-align: center; } input[type="button"] { border-radius: 10px; } </style> </head> <body> <form> <fieldset> <legend>HTML-DOM-Video-textTracks</legend> <video id="demo" width="320" controls> <source src="https://tutorialspoint.com/html5/foo.mp4" type="video/mp4"> <track default kind="subtitles" srclang="en" src="sample-en.srt" label="English"/> <track kind="subtitles" srclang="es" src="sample-es.srt" label="Spanish" /> </video><br> <input type="button" onclick="getTrackDetails()" value="Get Total Text Tracks"> <div id="divDisplay"></div> </fieldset> </form> <script> var divDisplay = document.getElementById("divDisplay"); var textSelect = document.getElementById("textSelect"); var demo = document.getElementById("demo"); function getTrackDetails() { divDisplay.textContent = 'Total text tracks '+demo.textTracks.length; divDisplay.textContent += ', 1. '+demo.textTracks[0].label; divDisplay.textContent += ', 2. '+demo.textTracks[1].label; } </script> </body> </html>
输出
在点击 **‘获得文本轨道总数’** 按钮之前 -
在点击 **‘获得文本轨道总数’** 按钮之后 -
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