W3School TIY
编辑您的代码：
<!DOCTYPE html> <html> <body> <button onclick="changeSource()" type="button">改变视频</button> <br /> <br /> <video id="video1" controls="controls" autoplay="autoplay"> <source id="mp4_src" src="../example/html5/mov_bbb.mp4" type="video/mp4"> <source id="ogg_src" src="../example/html5/mov_bbb.ogg" type="video/ogg"> Your browser does not support HTML5 video. </video> <script> myVid=document.getElementById("video1"); function changeSource() { isSupp=myVid.canPlayType("video/mp4"); if (isSupp=="") { myVid.src="movie.ogg"/*tpa=http://www.jb51.net/tiy/movie.ogg*/; } else { myVid.src="movie.mp4"/*tpa=http://www.jb51.net/tiy/movie.mp4*/; } myVid.load(); } </script> </body> </html>
查看结果: