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HTML 参考手册
HTML 音频/视频 DOM src 属性
tryhtml5_av_prop_src
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<!DOCTYPE html> <html> <body> <button onclick="myFunction()" type="button">Change Video</button><br> <video id="myVideo" controls autoplay> <source id="mp4_src" src="/demo/video/mov_bbb.mp4" type="video/mp4"> <source id="ogg_src" src="/demo/video/mov_bbb.ogg" type="video/ogg"> Your browser does not support HTML5 video. </video> <script> let vid = document.getElementById("myVideo"); function myFunction() { isSupp = vid.canPlayType("video/mp4"); if (isSupp == "") { vid.src = "movie.ogg"; } else { vid.src = "movie.mp4"; } vid.load(); } </script> </body> </html>