我试图获取播放器的视频持续时间，但它返回NaN，我不完全确定如何从这里访问它。
<video id="videoPlayerNew" class="video-js vjs-default-skin vjs-controls-enabled" poster="http://camendesign.com/code/video_for_everybody/poster.jpg" data-setup="{}" controls="">
<source src="sample.mp4" type="video/mp4">
<p class="vjs-no-js">Javascript was disabled or not supported</p>
</video>
<script>
var vid = document.getElementById("videoPlayerNew");
console.log(vid.duration);
</script>
日志告诉我：NaN
等待onloadedmetadata https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/loadedmetadata_event事件，loadedmetadata事件被触发时metadata已加载。
var myVideo = document.getElementById("videoPlayerNew");
myVideo.onloadedmetadata = function() {
console.log('metadata loaded!');
console.log(this.duration);//this refers to myVideo
};
<video id="videoPlayerNew" class="video-js vjs-default-skin vjs-controls-enabled" poster="http://camendesign.com/code/video_for_everybody/poster.jpg" data-setup="{}" controls="">
<source src="http://www.w3schools.com/html/mov_bbb.mp4" type="video/mp4">
<p class="vjs-no-js">Javascript was disabled or not supported</p>
</video>
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