js如何判断video播放的视频内容是已经缓存了的还是新请求的？

Question

js如何判断video播放的视频内容是已经缓存了的还是新请求的？
比如clppr.js里面也没有相关的状态判断。

// You can either listen some events this way
var player = new Clappr.Player({
  events: {
    onReady: function() { ... }, //Fired when the player is ready on startup
    onResize: function() { ... },//Fired when player resizes
    onPlay: function() { ... },//Fired when player starts to play
    onPause: function() { ... },//Fired when player pauses
    onStop: function() { ... },//Fired when player stops
    onEnded: function() { ... },//Fired when player ends the video
    onSeek: function() { ... },//Fired when player seeks the video
    onError: function() { ... },//Fired when player receives an error
    onTimeUpdate: function() { ... },//Fired when the time is updated on player
    onVolumeUpdate: function() { ... },//Fired when player updates its volume
  }
})
// or this way
player.on(Clappr.Events.PLAYER_PLAY, function() { ... })

Answer 1

你想新请求就加个时间戳。读缓存会特别快。加载慢一点。如果错误的话，会有error。这样来看的话。设置一个超时间，超过这个时间不报错的就是错误。