解决方案:
https://github.com/prateekrastogi/videojs-landscape-fullscreen
如图,videojs后引入
videojs-landscape-fullscreen.min.js
var player = videojs('some-player-id');
后加
player.landscapeFullscreen();
这样当点击全屏按钮后会自动横屏全屏
找了好久,记录分享一下。