W3Schools 在线编辑工具（TIY） V3.0
编辑的代码:
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<!DOCTYPE html> <html> <body> <button onclick="addNewTextTrack()" type="button">添加一个新的文本轨道</button> <br /> <br /> <video id="video1" controls="controls"> <source src="/example/html5/mov_bbb.mp4" type="video/mp4"> <source src="/example/html5/mov_bbb.ogg" type="video/ogg"> Your browser does not support HTML5 video. </video> <script> myVid=document.getElementById("video1"); function addNewTextTrack() { text1=myVid.addTextTrack("caption"); text1.addCue(new TextTrackCue("Test text", 01.000, 04.000,"","","",true)); } </script> </body> </html>