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MSE的demo实现思路：首先准备fmp4格式的视频地址或者切片，接着将MSE挂载到video上，创建createObjectURL转二进制数据，fetch请求在线地址，分段请求，监听这个数据流的获取状态，当这个ReadyState为open的时候， sourceBuffer.appendBuffer(buf)处理接收到的数据，否则mediaSource.endOfStream()结束接收数据流。
代码
<!DOCTYPE html>
<html><head><meta charset="utf-8" />
</head><body><video controls></video><script>var video=document.querySelector('video');// 视频 URL 队列（按顺序播放）var assetURLs=[....];// 当前播放的 URL 索引var currentIndex=0;// MIME 类型var mimeCodec='video/mp4; codecs="avc1.42E01E, mp4a.40.2"';if('MediaSource' in window&&MediaSource.isTypeSupported(mimeCodec)) {var mediaSource=new MediaSource();video.src=URL.createObjectURL(mediaSource);mediaSource.addEventListener('sourceopen',sourceOpen);} else {console.error('Unsupported MIME type or codec: ',mimeCodec);}function sourceOpen (_) {var mediaSource=this;var sourceBuffer=mediaSource.addSourceBuffer(mimeCodec);function loadNextVideo () {if(currentIndex>=assetURLs.length) {console.log('All videos played.');return;}var assetURL=assetURLs[currentIndex];fetchAB(assetURL,function(buf) {sourceBuffer.addEventListener('updateend',function updateEndHandler (_) {sourceBuffer.removeEventListener('updateend',updateEndHandler);currentIndex++;if(currentIndex<assetURLs.length) {mediaSource.removeSourceBuffer(sourceBuffer); // 清空 SourceBuffermediaSource.endOfStream();loadNextVideo(); // 加载下一个视频} else {mediaSource.endOfStream();console.log('All videos loaded.');}video.play();});sourceBuffer.appendBuffer(buf);});}loadNextVideo();}function fetchAB (url,cb) {console.log(url);var xhr=new XMLHttpRequest();xhr.open('get',url);xhr.responseType='arraybuffer';xhr.onload=function() {cb(xhr.response);};xhr.send();}</script>
</body></html>