如何检测YouTube视频何时播放完毕？

这可以通过youtube播放器API完成：

工作示例：

    <div id="player"></div>    <script src="http://www.youtube.com/player_api"></script>    <script>        // create youtube player        var player;        function onYouTubePlayerAPIReady() { player = new YT.Player('player', {   width: '640',   height: '390',   videoId: '0Bmhjf0rKe8',   events: {     onReady: onPlayerReady,     onStateChange: onPlayerStateChange   } });        }        // autoplay video        function onPlayerReady(event) { event.target.playVideo();        }        // when video ends        function onPlayerStateChange(event) {         if(event.data === 0) {    alert('done'); }        }    </script>