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Showing content from https://developer.cdn.mozilla.net/zh-CN/docs/Web/API/HTMLMediaElement/duration below:

HTMLMediaElement.duration - Web API | MDN

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HTMLMediaElement.duration 属性以秒为单位给出媒体的长度，如果没有媒体数据可用，则为零。

var myDuration = audioOrVideo.duration;

如果媒体数据可用但长度未知，则此值为 NaN。如果媒体流式传输且没有预定义长度，则值为 Inf。

var obj = document.createElement("video");
console.log(obj.duration); // NaN

• 定义它的接口，HTMLMediaElement。

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