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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/API/HTMLMediaElement/durationchange_event below:

HTMLMediaElement: durationchange 事件 - Web API

下面的例子为 HTMLMediaElement 的 durationchange 事件添加事件监听器，然后在事件触发时发送一个消息。

使用 addEventListener():

const video = document.querySelector("video");

video.addEventListener("durationchange", (event) => {
  console.log("Not sure why, but the duration of the video has changed.");
});

使用 ondurationchange 事件处理器属性：

const video = document.querySelector("video");

video.ondurationchange = (event) => {
  console.log("Not sure why, but the duration of the video has changed.");
};

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