我正在加载YouTube播放器API，如下所示:varplayer;functiononYouTubeIframeAPIReady(){console.log("iframeready");player=newYT.Player('player',{height:'390',width:'640',events:{'onReady':onPlayerReady,'onStateChange':onPlayerStateChange}});}functiononPlayerReady(){console.log("playerready");}在chrome上，IFrame就绪和播放器就